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Giuseppe Colla - One of the best experts on this subject based on the ideXlab platform.
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changes in biomass mineral composition and quality of cardoon in response to formula see text cl ratio and nitrate deprivation from the Nutrient Solution
Frontiers in Plant Science, 2016Co-Authors: Daniela Borgognone, Youssef Rouphael, Mariateresa Cardarelli, Luigi Lucini, Giuseppe CollaAbstract:Leaf extracts of cultivated cardoon (Cynara cardunculus L. var. altilis DC) is an important source of phenols. Soilless culture represents an important and alternative tool to traditional agriculture, since it allows a precise control of plant nutrition and the maximization of yield and quality of the products. Reducing N supply, while keeping quantity as high as possible is desirable for environmental and health-related reasons, especially that N deficiency can lead to improved concentrations of secondary plant metabolites. Two greenhouse experiments were carried out in order to determine the effect of a decreasing NO3- : Cl- ratio (80:20, 60:40, 40:60 or 20:80) and nitrate deprivation (0, 5, 10 or 15 days before harvest) on biomass production, leaf chlorophyll content and fluorescence, mineral composition, and phytochemicals in leaves of cardoon ‘Bianco Avorio’ grown in a floating system. Total phenols, flavonoids and antioxidant capacity increased linearly with Cl- availability, especially when nitrate was replaced by 80% of chloride (20:80 NO3- : Cl- ratio), without having a detrimental effect on yield. Total nitrogen and nitrate concentration in leaves decreased linearly with increasing Cl- in the Nutrient Solution. Total phenols and antioxidant capacity recorded after 15 days of nitrate deprivation were higher by 43.1%, 42.8% and 44.3% and by 70.5%, 40.9% and 62.2%, at 59, 97 and 124 DAS, respectively compared to the control treatment. The decrease in leaf nitrate content recorded under N-deprivation occurred more rapidly than the reduction in total nitrogen. Thus, up to 15 days of nitrate withdrawal could lower nitrates without sharply reduce total nitrogen or affecting growth and biomass of cultivated cardoon. The use of N-free Nutrient Solution prior to harvest or the replacement of nitrates with chlorides could be adopted among growers to improve the quality of the product and enhance sustainability of crop production system.
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effect of nitrogen form and Nutrient Solution ph on growth and mineral composition of self grafted and grafted tomatoes
Scientia Horticulturae, 2013Co-Authors: Daniela Borgognone, Youssef Rouphael, Mariateresa Cardarelli, Giuseppe Colla, E Rea, Dietmar SchwarzAbstract:Abstract Three greenhouse experiments were carried out to determine the effect of the nitrogen form and the Nutrient Solution pH on growth, yield, leaf gas exchange, carbohydrate, N-compound concentrations and mineral composition of tomato cv. Moneymaker (Solanum lycopersicum L.) self-grafted and grafted onto ‘Maxifort’ (S. lycopersicum L. × S. habrochaites S. Knapp and D. M. Spooner) grown in hydroponics. Exp. 1 included five pH levels in the Nutrient Solution (3.5, 4.5, 5.5, 6.5, and 7.5) while in the Exps. 2 and 3 four different ratios of NO3− to NH4+ (100:0, 70:30, 30:70, and 0:100) were used. The Exps. 1 and 2 were performed in a short period of time (about 20 days) while Exp. 3 was a long-term experiment. No significant differences among treatments were observed in shoot and root dry biomass of tomato in the pH experiment (Exp. 1), whereas shoot dry biomass, Ca and Mg concentrations decreased sharply when N was exclusively provided as NH4+ (Exp. 2). When averaged over the pH level of the Nutrient Solution, the highest Ca, Fe, Zn, and Cu concentrations were recorded in grafted than self-grafted plants (Exp. 1), whereas in Exp. 2 shoot and root biomass values recorded in grafted plants were significantly higher than those observed for self-grafted plants, by 20%, and 24%, respectively. In the long-term experiment, the plant growth and yield decreased in response to an increase of NH4+ in the Nutrient Solution. The decrease in marketable yield with decreasing NO3−:NH4+ ratio resulted mainly from the increase of blossom-end rot, which reduced the number of marketable fruits per plant. The adverse effects of an increased supply in NH4+ have been associated to a fall in Ca and Mg levels in plant tissues. The carbohydrate concentrations, amino acids and proteins increased under NH4+ in comparison to NO3− based nutrition. Moreover, NH4+ toxicity was associated with reduced rates of net photosynthesis. Our results also demonstrated that grafting ‘Moneymaker’ into ‘Maxifort’ did not mitigate the negative effects of ammonium nutrition on tomato productivity.
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Nutrient Solution concentration and growing season affect growth and quality of potted petunia in a recirculating subirrigation and drip-irrigation system
Journal of Food Agriculture & Environment, 2010Co-Authors: Mariateresa Cardarelli, Alejandra Salerno, Youssef Rouphael, Giuseppe CollaAbstract:Petunias (Petunia × hybrida Hort. Vilm.-Andr. ‘Giove’) were grown in closed soilless systems to evaluate the effects of irrigation system (drip and subirrigation) and Nutrient Solution concentration (half and full) during two consecutive growing seasons (spring and winter) in terms of substrate electrical conductivity (EC s ), growth, quality, crop evapotranspiration (ET c ), growth index water use efficiency (WUE GI ) and Nutrient uptake. At the end of the cultural cycle the highest EC s in the upper and lower layers were recorded in the spring season on plants grown in subirrigation using a full Nutrient Solution concentration. The higher EC s recorded with subirrigation under full strength Nutrient Solution in the spring season, had no negative effect on plant growth parameters and quality index indicating that petunia can be considered tolerant to salinity. The highest shoot biomass, leaf area, and plant growth index were recorded in the winter season on plants grown in both drip-irrigation and subirrigation using full Nutrient Solution concentration, whereas the lowest values were observed in the winter season on plants grown using the half Nutrient Solution concentration. Higher total evapotranspiration was recorded in the winter compared to spring season (4.3 vs. 3.5 L m -2 ), because the plants grown during the winter season required more days (20) to reach the commercial maturity in comparison to those grown during the spring season. The WUE GI recorded on plants grown during the spring season was significantly higher by 24% than those recorded during the winter season. The highest N, P, K, Ca and Mg uptake values were measured during winter season using full strength Nutrient Solution. The variation of the EC in the Nutrient Solution during the spring growing cycle was less pronounced in the subirrigation than with a drip-irrigation system which represents an important aspect for the simplification of the closed loop management of the Nutrient Solution.
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Nutrient Solution concentration and growing season affect yield and quality of lactuca sativa l var acephala in floating raft culture
Journal of the Science of Food and Agriculture, 2009Co-Authors: C Fallovo, Alberto Battistelli, Youssef Rouphael, Giuseppe CollaAbstract:BACKGROUND:Thereisgrowinginterestamongconsumersinbabyleafvegetables,mostlyrequestedformixedsalads,bothas fresh market products and ready-to-use vegetables. Fertilisation is one of the most practical and effective ways of controlling and improving the yield and nutritional quality of crops for human consumption. The optimal fertiliser concentration for baby leafvegetablesdependsontheenvironmentalconditions.Theaimofthepresentwork wastodeterminetheeffectsofNutrient Solution concentration (2, 18, 34, 50 or 66 mequiv L −1 ) during two consecutive growing seasons (spring and summer) on the yield and leaf quality of LactucasativaL. var. acephalagrown in a floating system. RESULTS: Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in Nutrient Solution concentration, while the opposite trend was observed for root/shoot ratio and glucose, fructose, starch, total carbohydrate and protein contents. Plants grown in the spring season exhibited lower yield and growth (total dry biomass and leaf area index) but higher leaf quality (higher carbohydrate content and lower nitrate content) than those grown in the summer season. CONCLUSION: The use of Nutrient Solution concentrations of 37 and 44 mequiv L −1 for the spring and summer seasons respectively could be adopted in the present conditions to improve marketablefresh yield and leaf mineralcontent, but with a slight reduction in some nutritional parameters. c � 2009 Society of Chemical Industry
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the influence of drip irrigation or subirrigation on zucchini squash grown in closed loop substrate culture with high and low Nutrient Solution concentrations
Hortscience, 2009Co-Authors: Youssef Rouphael, Giuseppe CollaAbstract:Zucchini plants (Cucurbita pepo L. cultivar Afrodite) were grown during a summer-fall season in closed-soilless systems using a mixture peat-pumice to evaluate the effects of irrigation system (drip irrigation and subirrigation) and Nutrient Solution concentration (half = 1 dSm -1 and full = 2 dSm -1 ) in terms of substrate electrical conductivity (ECs) using the dilution 1:1.5 media:water method, growth, yield, leaf mineral composition, fruit quality, and mineral Solution composition. At the end of the cultural cycle, the highest ECs at the upper (0 to 7.5 cm) and lower (7.5 to 15.0 cm) layers were recorded with subirrigation using a full Nutrient Solution concentration. The highest plant growth, yield, and leaf macroelements concentration (nitrogen, phospho- rus, and potassium) were recorded in both irrigation systems using a full-strength Solution, followed by drip irrigation, and finally by subirrigation treatment using a half- strength Nutrient Solution. Fruit yield, fruit mineral composition (phosphorus, potas- sium, calcium, and magnesium), and leaf macroelements concentration (nitrogen, phosphorus, potassium, and magnesium) were substantially reduced when the concen- trations of macroNutrients in the feed Solution were lowered to 50% of control. Using half-Nutrient Solution concentration, the marketable yield reduction was more pro- nounced with subirrigation (58%) than with drip irrigation (42%). The variation of the macroNutrient and EC in the Solution during the growing cycle was less pro- nounced in the subirrigation than with the drip irrigation system, which represents an important aspect for the simplification of the closed-loop management of the Nutrient Solution.
Youssef Rouphael - One of the best experts on this subject based on the ideXlab platform.
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changes in biomass mineral composition and quality of cardoon in response to formula see text cl ratio and nitrate deprivation from the Nutrient Solution
Frontiers in Plant Science, 2016Co-Authors: Daniela Borgognone, Youssef Rouphael, Mariateresa Cardarelli, Luigi Lucini, Giuseppe CollaAbstract:Leaf extracts of cultivated cardoon (Cynara cardunculus L. var. altilis DC) is an important source of phenols. Soilless culture represents an important and alternative tool to traditional agriculture, since it allows a precise control of plant nutrition and the maximization of yield and quality of the products. Reducing N supply, while keeping quantity as high as possible is desirable for environmental and health-related reasons, especially that N deficiency can lead to improved concentrations of secondary plant metabolites. Two greenhouse experiments were carried out in order to determine the effect of a decreasing NO3- : Cl- ratio (80:20, 60:40, 40:60 or 20:80) and nitrate deprivation (0, 5, 10 or 15 days before harvest) on biomass production, leaf chlorophyll content and fluorescence, mineral composition, and phytochemicals in leaves of cardoon ‘Bianco Avorio’ grown in a floating system. Total phenols, flavonoids and antioxidant capacity increased linearly with Cl- availability, especially when nitrate was replaced by 80% of chloride (20:80 NO3- : Cl- ratio), without having a detrimental effect on yield. Total nitrogen and nitrate concentration in leaves decreased linearly with increasing Cl- in the Nutrient Solution. Total phenols and antioxidant capacity recorded after 15 days of nitrate deprivation were higher by 43.1%, 42.8% and 44.3% and by 70.5%, 40.9% and 62.2%, at 59, 97 and 124 DAS, respectively compared to the control treatment. The decrease in leaf nitrate content recorded under N-deprivation occurred more rapidly than the reduction in total nitrogen. Thus, up to 15 days of nitrate withdrawal could lower nitrates without sharply reduce total nitrogen or affecting growth and biomass of cultivated cardoon. The use of N-free Nutrient Solution prior to harvest or the replacement of nitrates with chlorides could be adopted among growers to improve the quality of the product and enhance sustainability of crop production system.
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effect of nitrogen form and Nutrient Solution ph on growth and mineral composition of self grafted and grafted tomatoes
Scientia Horticulturae, 2013Co-Authors: Daniela Borgognone, Youssef Rouphael, Mariateresa Cardarelli, Giuseppe Colla, E Rea, Dietmar SchwarzAbstract:Abstract Three greenhouse experiments were carried out to determine the effect of the nitrogen form and the Nutrient Solution pH on growth, yield, leaf gas exchange, carbohydrate, N-compound concentrations and mineral composition of tomato cv. Moneymaker (Solanum lycopersicum L.) self-grafted and grafted onto ‘Maxifort’ (S. lycopersicum L. × S. habrochaites S. Knapp and D. M. Spooner) grown in hydroponics. Exp. 1 included five pH levels in the Nutrient Solution (3.5, 4.5, 5.5, 6.5, and 7.5) while in the Exps. 2 and 3 four different ratios of NO3− to NH4+ (100:0, 70:30, 30:70, and 0:100) were used. The Exps. 1 and 2 were performed in a short period of time (about 20 days) while Exp. 3 was a long-term experiment. No significant differences among treatments were observed in shoot and root dry biomass of tomato in the pH experiment (Exp. 1), whereas shoot dry biomass, Ca and Mg concentrations decreased sharply when N was exclusively provided as NH4+ (Exp. 2). When averaged over the pH level of the Nutrient Solution, the highest Ca, Fe, Zn, and Cu concentrations were recorded in grafted than self-grafted plants (Exp. 1), whereas in Exp. 2 shoot and root biomass values recorded in grafted plants were significantly higher than those observed for self-grafted plants, by 20%, and 24%, respectively. In the long-term experiment, the plant growth and yield decreased in response to an increase of NH4+ in the Nutrient Solution. The decrease in marketable yield with decreasing NO3−:NH4+ ratio resulted mainly from the increase of blossom-end rot, which reduced the number of marketable fruits per plant. The adverse effects of an increased supply in NH4+ have been associated to a fall in Ca and Mg levels in plant tissues. The carbohydrate concentrations, amino acids and proteins increased under NH4+ in comparison to NO3− based nutrition. Moreover, NH4+ toxicity was associated with reduced rates of net photosynthesis. Our results also demonstrated that grafting ‘Moneymaker’ into ‘Maxifort’ did not mitigate the negative effects of ammonium nutrition on tomato productivity.
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Nutrient Solution concentration and growing season affect growth and quality of potted petunia in a recirculating subirrigation and drip-irrigation system
Journal of Food Agriculture & Environment, 2010Co-Authors: Mariateresa Cardarelli, Alejandra Salerno, Youssef Rouphael, Giuseppe CollaAbstract:Petunias (Petunia × hybrida Hort. Vilm.-Andr. ‘Giove’) were grown in closed soilless systems to evaluate the effects of irrigation system (drip and subirrigation) and Nutrient Solution concentration (half and full) during two consecutive growing seasons (spring and winter) in terms of substrate electrical conductivity (EC s ), growth, quality, crop evapotranspiration (ET c ), growth index water use efficiency (WUE GI ) and Nutrient uptake. At the end of the cultural cycle the highest EC s in the upper and lower layers were recorded in the spring season on plants grown in subirrigation using a full Nutrient Solution concentration. The higher EC s recorded with subirrigation under full strength Nutrient Solution in the spring season, had no negative effect on plant growth parameters and quality index indicating that petunia can be considered tolerant to salinity. The highest shoot biomass, leaf area, and plant growth index were recorded in the winter season on plants grown in both drip-irrigation and subirrigation using full Nutrient Solution concentration, whereas the lowest values were observed in the winter season on plants grown using the half Nutrient Solution concentration. Higher total evapotranspiration was recorded in the winter compared to spring season (4.3 vs. 3.5 L m -2 ), because the plants grown during the winter season required more days (20) to reach the commercial maturity in comparison to those grown during the spring season. The WUE GI recorded on plants grown during the spring season was significantly higher by 24% than those recorded during the winter season. The highest N, P, K, Ca and Mg uptake values were measured during winter season using full strength Nutrient Solution. The variation of the EC in the Nutrient Solution during the spring growing cycle was less pronounced in the subirrigation than with a drip-irrigation system which represents an important aspect for the simplification of the closed loop management of the Nutrient Solution.
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Nutrient Solution concentration and growing season affect yield and quality of lactuca sativa l var acephala in floating raft culture
Journal of the Science of Food and Agriculture, 2009Co-Authors: C Fallovo, Alberto Battistelli, Youssef Rouphael, Giuseppe CollaAbstract:BACKGROUND:Thereisgrowinginterestamongconsumersinbabyleafvegetables,mostlyrequestedformixedsalads,bothas fresh market products and ready-to-use vegetables. Fertilisation is one of the most practical and effective ways of controlling and improving the yield and nutritional quality of crops for human consumption. The optimal fertiliser concentration for baby leafvegetablesdependsontheenvironmentalconditions.Theaimofthepresentwork wastodeterminetheeffectsofNutrient Solution concentration (2, 18, 34, 50 or 66 mequiv L −1 ) during two consecutive growing seasons (spring and summer) on the yield and leaf quality of LactucasativaL. var. acephalagrown in a floating system. RESULTS: Marketable fresh yield, total dry biomass, leaf area index, macroelement (N, P, K and Mg) concentrations and nitrate and total chlorophyll contents increased in response to an increase in Nutrient Solution concentration, while the opposite trend was observed for root/shoot ratio and glucose, fructose, starch, total carbohydrate and protein contents. Plants grown in the spring season exhibited lower yield and growth (total dry biomass and leaf area index) but higher leaf quality (higher carbohydrate content and lower nitrate content) than those grown in the summer season. CONCLUSION: The use of Nutrient Solution concentrations of 37 and 44 mequiv L −1 for the spring and summer seasons respectively could be adopted in the present conditions to improve marketablefresh yield and leaf mineralcontent, but with a slight reduction in some nutritional parameters. c � 2009 Society of Chemical Industry
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the influence of drip irrigation or subirrigation on zucchini squash grown in closed loop substrate culture with high and low Nutrient Solution concentrations
Hortscience, 2009Co-Authors: Youssef Rouphael, Giuseppe CollaAbstract:Zucchini plants (Cucurbita pepo L. cultivar Afrodite) were grown during a summer-fall season in closed-soilless systems using a mixture peat-pumice to evaluate the effects of irrigation system (drip irrigation and subirrigation) and Nutrient Solution concentration (half = 1 dSm -1 and full = 2 dSm -1 ) in terms of substrate electrical conductivity (ECs) using the dilution 1:1.5 media:water method, growth, yield, leaf mineral composition, fruit quality, and mineral Solution composition. At the end of the cultural cycle, the highest ECs at the upper (0 to 7.5 cm) and lower (7.5 to 15.0 cm) layers were recorded with subirrigation using a full Nutrient Solution concentration. The highest plant growth, yield, and leaf macroelements concentration (nitrogen, phospho- rus, and potassium) were recorded in both irrigation systems using a full-strength Solution, followed by drip irrigation, and finally by subirrigation treatment using a half- strength Nutrient Solution. Fruit yield, fruit mineral composition (phosphorus, potas- sium, calcium, and magnesium), and leaf macroelements concentration (nitrogen, phosphorus, potassium, and magnesium) were substantially reduced when the concen- trations of macroNutrients in the feed Solution were lowered to 50% of control. Using half-Nutrient Solution concentration, the marketable yield reduction was more pro- nounced with subirrigation (58%) than with drip irrigation (42%). The variation of the macroNutrient and EC in the Solution during the growing cycle was less pro- nounced in the subirrigation than with the drip irrigation system, which represents an important aspect for the simplification of the closed-loop management of the Nutrient Solution.
Mariateresa Cardarelli - One of the best experts on this subject based on the ideXlab platform.
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changes in biomass mineral composition and quality of cardoon in response to formula see text cl ratio and nitrate deprivation from the Nutrient Solution
Frontiers in Plant Science, 2016Co-Authors: Daniela Borgognone, Youssef Rouphael, Mariateresa Cardarelli, Luigi Lucini, Giuseppe CollaAbstract:Leaf extracts of cultivated cardoon (Cynara cardunculus L. var. altilis DC) is an important source of phenols. Soilless culture represents an important and alternative tool to traditional agriculture, since it allows a precise control of plant nutrition and the maximization of yield and quality of the products. Reducing N supply, while keeping quantity as high as possible is desirable for environmental and health-related reasons, especially that N deficiency can lead to improved concentrations of secondary plant metabolites. Two greenhouse experiments were carried out in order to determine the effect of a decreasing NO3- : Cl- ratio (80:20, 60:40, 40:60 or 20:80) and nitrate deprivation (0, 5, 10 or 15 days before harvest) on biomass production, leaf chlorophyll content and fluorescence, mineral composition, and phytochemicals in leaves of cardoon ‘Bianco Avorio’ grown in a floating system. Total phenols, flavonoids and antioxidant capacity increased linearly with Cl- availability, especially when nitrate was replaced by 80% of chloride (20:80 NO3- : Cl- ratio), without having a detrimental effect on yield. Total nitrogen and nitrate concentration in leaves decreased linearly with increasing Cl- in the Nutrient Solution. Total phenols and antioxidant capacity recorded after 15 days of nitrate deprivation were higher by 43.1%, 42.8% and 44.3% and by 70.5%, 40.9% and 62.2%, at 59, 97 and 124 DAS, respectively compared to the control treatment. The decrease in leaf nitrate content recorded under N-deprivation occurred more rapidly than the reduction in total nitrogen. Thus, up to 15 days of nitrate withdrawal could lower nitrates without sharply reduce total nitrogen or affecting growth and biomass of cultivated cardoon. The use of N-free Nutrient Solution prior to harvest or the replacement of nitrates with chlorides could be adopted among growers to improve the quality of the product and enhance sustainability of crop production system.
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effect of nitrogen form and Nutrient Solution ph on growth and mineral composition of self grafted and grafted tomatoes
Scientia Horticulturae, 2013Co-Authors: Daniela Borgognone, Youssef Rouphael, Mariateresa Cardarelli, Giuseppe Colla, E Rea, Dietmar SchwarzAbstract:Abstract Three greenhouse experiments were carried out to determine the effect of the nitrogen form and the Nutrient Solution pH on growth, yield, leaf gas exchange, carbohydrate, N-compound concentrations and mineral composition of tomato cv. Moneymaker (Solanum lycopersicum L.) self-grafted and grafted onto ‘Maxifort’ (S. lycopersicum L. × S. habrochaites S. Knapp and D. M. Spooner) grown in hydroponics. Exp. 1 included five pH levels in the Nutrient Solution (3.5, 4.5, 5.5, 6.5, and 7.5) while in the Exps. 2 and 3 four different ratios of NO3− to NH4+ (100:0, 70:30, 30:70, and 0:100) were used. The Exps. 1 and 2 were performed in a short period of time (about 20 days) while Exp. 3 was a long-term experiment. No significant differences among treatments were observed in shoot and root dry biomass of tomato in the pH experiment (Exp. 1), whereas shoot dry biomass, Ca and Mg concentrations decreased sharply when N was exclusively provided as NH4+ (Exp. 2). When averaged over the pH level of the Nutrient Solution, the highest Ca, Fe, Zn, and Cu concentrations were recorded in grafted than self-grafted plants (Exp. 1), whereas in Exp. 2 shoot and root biomass values recorded in grafted plants were significantly higher than those observed for self-grafted plants, by 20%, and 24%, respectively. In the long-term experiment, the plant growth and yield decreased in response to an increase of NH4+ in the Nutrient Solution. The decrease in marketable yield with decreasing NO3−:NH4+ ratio resulted mainly from the increase of blossom-end rot, which reduced the number of marketable fruits per plant. The adverse effects of an increased supply in NH4+ have been associated to a fall in Ca and Mg levels in plant tissues. The carbohydrate concentrations, amino acids and proteins increased under NH4+ in comparison to NO3− based nutrition. Moreover, NH4+ toxicity was associated with reduced rates of net photosynthesis. Our results also demonstrated that grafting ‘Moneymaker’ into ‘Maxifort’ did not mitigate the negative effects of ammonium nutrition on tomato productivity.
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Nutrient Solution concentration and growing season affect growth and quality of potted petunia in a recirculating subirrigation and drip-irrigation system
Journal of Food Agriculture & Environment, 2010Co-Authors: Mariateresa Cardarelli, Alejandra Salerno, Youssef Rouphael, Giuseppe CollaAbstract:Petunias (Petunia × hybrida Hort. Vilm.-Andr. ‘Giove’) were grown in closed soilless systems to evaluate the effects of irrigation system (drip and subirrigation) and Nutrient Solution concentration (half and full) during two consecutive growing seasons (spring and winter) in terms of substrate electrical conductivity (EC s ), growth, quality, crop evapotranspiration (ET c ), growth index water use efficiency (WUE GI ) and Nutrient uptake. At the end of the cultural cycle the highest EC s in the upper and lower layers were recorded in the spring season on plants grown in subirrigation using a full Nutrient Solution concentration. The higher EC s recorded with subirrigation under full strength Nutrient Solution in the spring season, had no negative effect on plant growth parameters and quality index indicating that petunia can be considered tolerant to salinity. The highest shoot biomass, leaf area, and plant growth index were recorded in the winter season on plants grown in both drip-irrigation and subirrigation using full Nutrient Solution concentration, whereas the lowest values were observed in the winter season on plants grown using the half Nutrient Solution concentration. Higher total evapotranspiration was recorded in the winter compared to spring season (4.3 vs. 3.5 L m -2 ), because the plants grown during the winter season required more days (20) to reach the commercial maturity in comparison to those grown during the spring season. The WUE GI recorded on plants grown during the spring season was significantly higher by 24% than those recorded during the winter season. The highest N, P, K, Ca and Mg uptake values were measured during winter season using full strength Nutrient Solution. The variation of the EC in the Nutrient Solution during the spring growing cycle was less pronounced in the subirrigation than with a drip-irrigation system which represents an important aspect for the simplification of the closed loop management of the Nutrient Solution.
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the influence of irrigation system and Nutrient Solution concentration on potted geranium production under various conditions of radiation and temperature
Scientia Horticulturae, 2008Co-Authors: Youssef Rouphael, Mariateresa Cardarelli, E Rea, Giuseppe CollaAbstract:Abstract Zonal geranium ( Pelargonium × hortorum ‘Real Mintaka’) were grown in closed soilless systems to evaluate the effects of irrigation system (drip and subirrigation) and Nutrient Solution concentration (half and full) under various conditions of radiation and temperature (winter and summer) in terms of substrate electrical conductivity (EC s ), growth, quality, crop evapotranspiration (ET c ) and growth index water use efficiency (WUE GI ) and Nutrient uptake. At he end of the cultural cycle the highest EC s in the upper and lower layers were recorded in the spring season on plants grown in subirrigation using a full Nutrient Solution concentration. The highest shoot biomass, leaf area, plant growth index, and quality index were recorded in the winter season on plants grown in both drip-irrigation and subirrigation using half and full Nutrient Solution concentration, whereas the lowest value was observed in the spring season on plants grown with subirrigation using the full Nutrient Solution concentration. The highest maximum air temperature recorded during the first 20 days after transplanting in the spring growing season was presumably responsible for the reduction in shoot biomass production, growth and quality index, and in time of geranium flowering compared to the plants grown in the winter season. The ET c was 44% higher in spring than in winter season treatment, while the effect of the irrigation system was less pronounced with an increase in 11% in the subirrigation treatment compared with the drip-irrigation system. WUE GI was not stable and showed a seasonal variability. Solar radiaton ( R s ), air temperature ( T a ) and vapour pressure deficit (VPD) were greatly higher in the spring season, which influenced WUE GI negatively. The WUE GI improved especially when R s , T a and VPD were below 12 MJ m 2 , 20 °C and 0.6 kPa, respectively. The highest N, and Mg uptake were recorded in the winter season, especially on plants grown with subirrigation at 2 dS m −1 . The highest P, K, and Ca uptake values were measured during winter season using subirrigation system, and on plants grown under full strength Nutrient Solution. The variation of the nitrate concentration and EC in the Nutrient Solution during the spring growing cycle was less pronounced in the subirrigation than with a drip-irrigation system which represents an important aspect for the simplification of the closed loop management of the Nutrient Solution.
D Nwaga - One of the best experts on this subject based on the ideXlab platform.
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improvement of arbuscular mycorrhizal fungi inoculum production by Nutrient Solution concentration and soil texture variation
2015Co-Authors: Abossolo M Angue, Boyomo Onana, D NwagaAbstract:Arbuscular Mycorrhizal Fungi (AMF) can increase the yield of plants from 50 to 200 %, but the large scale multiplication of AMF inocula is difficult because of their trophic nature, and this represents a big challenge in tropical areas. Within the framework of the study, two separate experiments were conducted in order to determine the most favorable conditions for AMF spore production. The effect of Rorison’s Nutrient Solution (0, 4 and 8 ml/l) was tested on 6 types of AMF strains for spores production, while in the second experiment; it was the effect of soil-sand mixture variation (5-57 % clay content) that was evaluated in AMF spores production. A local variety of Sorghum bicolor was used as the host plant during the trials. Experiments were performed in completely randomized design with 4 replicates. Results showed that Rorison’s Nutrient Solution and soil texture significantly (P<0.05) influenced plant growth, symbiotic and biochemical parameters. Nutrient Solution induced significant increase in root colonization (5 to 36 %), and AMF spore production (12 to 23 spores/g of soil). The highest concentration of Rorison’s Nutrient Solution promoted more spore formation, but that was not translated in plant yield. Soil texture variation had a significant impact on AMF root colonization and spores production, since mixture of sand and clay, with clay variation from 20-43% was found to favor both parameters. These data suggest that soil texture variation and Nutrient Solution concentration can significantly improve AMF spores production and Sorghum symbiotic performances.
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improvement of arbuscular mycorrhizal fungi inoculum production by Nutrient Solution concentration and soil texture variation
2015Co-Authors: Abossolo M Angue, Boyomo Onana, D NwagaAbstract:Arbuscular Mycorrhizal Fungi (AMF) can increase the yield of plants from 50 to 200 %, but the large scale multiplication of AMF inocula is difficult because of their trophic nature, and this represents a big challenge in tropical areas. Within the framework of the study, two separate experiments were conducted in order to determine the most favorable conditions for AMF spore production. The effect of Rorison’s Nutrient Solution (0, 4 and 8 ml/l) was tested on 6 types of AMF strains for spores production, while in the second experiment; it was the effect of soil-sand mixture variation (5-57 % clay content) that was evaluated in AMF spores production. A local variety of Sorghum bicolor was used as the host plant during the trials. Experiments were performed in completely randomized design with 4 replicates. Results showed that Rorison’s Nutrient Solution and soil texture significantly (P<0.05) influenced plant growth, symbiotic and biochemical parameters. Nutrient Solution induced significant increase in root colonization (5 to 36 %), and AMF spore production (12 to 23 spores/g of soil). The highest concentration of Rorison’s Nutrient Solution promoted more spore formation, but that was not translated in plant yield. Soil texture variation had a significant impact on AMF root colonization and spores production, since mixture of sand and clay, with clay variation from 20-43% was found to favor both parameters. These data suggest that soil texture variation and Nutrient Solution concentration can significantly improve AMF spores production and Sorghum symbiotic performances.
F Saccardo - One of the best experts on this subject based on the ideXlab platform.
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changes in antioxidant content of tomato fruits in response to cultivar and Nutrient Solution composition
Journal of Agricultural and Food Chemistry, 2006Co-Authors: S Fanasca, Youssef Rouphael, Giuseppe Colla, Giuseppe Maiani, Eugenia Venneria, Elena Azzini, F SaccardoAbstract:The aim of this study was to investigate the effect of cationic proportions (K/Ca/Mg) in the Nutrient Solution on fruit quality (quality attributes and antioxidant content) using a high-pigment, ‘Lunarossa', tomato cultivar and a standard tomato cultivar (‘Corfu') grown in soilless culture. Treatments were defined by a factorial combination of three Nutrient Solutions having different cationic proportions and two indeterminately growing round tomato cultivars. A high proportion of K in the Nutrient Solution increased the quality attributes (fruit dry matter, total soluble solids content) and the lycopene content of tomato fruit, whereas a high proportion of Ca improved tomato fruit yield and reduced the incidence of blossom-end rot (BER). The highest total antioxidant activity was observed in the treatment with a high proportion of Mg in the Lunarossa cultivar. The high-pigment hybrid has provided a higher antioxidant content (lycopene and α-tocopherol content) than the commercial hybrid, but it was more ...
