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M Prabhakar - One of the best experts on this subject based on the ideXlab platform.
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Studies on NPK drip Fertigation in field grown tomato (Lycopersicon esculentum Mill.)
European Journal of Agronomy, 2004Co-Authors: S.s Hebbar, B.k Ramachandrappa, H.v Nanjappa, M PrabhakarAbstract:Abstract A field experiment was conducted during the summer seasons of 1999–2000 and 2000–2001 at the Main Research Station, University of Agricultural Sciences, Hebbal, Bangalore to study the effect of Fertigation with sources and levels of fertilizer and methods of fertilizer application on growth, yield and fertilizer-use efficiency of hybrid tomato in red sandy loam soil. There were eight treatments including furrow-irrigated and drip-irrigated controls, which was replicated three times. The investigations revealed that the total dry matter (TDM) production and leaf area index (LAI) were significantly higher in drip irrigation (165.8 g and 3.12, respectively) over furrow irrigation (140.2 g and 2.25, respectively). Water-soluble fertilizer (WSF) Fertigation recorded significantly higher total dry matter and LAI (181.9 g and 3.69, respectively) over drip irrigation. Chlorophyll concentration was significantly higher in Fertigation treatments over soil applied treatments at 90 DAT. The fruit yield of tomato was 19.9% higher in drip irrigation (71.9 Mg ha −1 ) over furrow irrigation (59.50 Mg ha −1 ). Fertigation with 100% WSF increased the fruit yield significantly (79.2 Mg ha −1 ) over furrow-irrigated control and drip irrigation. Subsurface drip Fertigation (76.55 Mg ha −1 ), nitrogen–potassium Fertigation (76.57 Mg ha −1 ) and 1/2 soil–1/2 Fertigation (76.51 Mg ha −1 ) had given fruit yields similar to WSF Fertigation. Significant yield reduction was recorded with 75% rate Fertigation (72.7 Mg ha −1 ) and normal fertilizer Fertigation (73.27 Mg ha −1 ) compared to WSF Fertigation. WSF Fertigation recorded significantly higher number of fruits per plant (56.9) and fertilizer-use efficiency (226.48 kg yield kg −1 NPK) compared to drip- and furrow-irrigated controls. Fertigation resulted in lesser leaching of NO 3 -N and K to deeper layer of soil. Subsurface drip Fertigation caused higher assimilable P in deeper layer. Root growth and NPK uptake was increased by WSF Fertigation.
Marcello Guiducci - One of the best experts on this subject based on the ideXlab platform.
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high Fertigation frequency improves nitrogen uptake and crop performance in processing tomato grown with high nitrogen and water supply
Agricultural Water Management, 2015Co-Authors: Michela Farneselli, Paolo Benincasa, Giacomo Tosti, Eric Simonne, Marcello GuiducciAbstract:A 2-year field experiment was carried out in Central Italy on processing tomato (Lycopersicon esculentum Mill., cv. PS1296) to assess the effect of Fertigation–irrigation frequency on crop N uptake and yield. The crop was grown with three N-fertiliser rates (0, 100 and 300kgNha−1: N0, N100 and N300, respectively) applied at three different Fertigation–irrigation weekly schedules: one Fertigation (F1) for the fertilised treatments, or one irrigation (I1) for the unfertilised control; three Fertigations (F3) for the fertilised treatments, or three irrigations (I3) for the unfertilised control; one Fertigation+two irrigations (F1+I2) for the fertilised treatments. The N rates and Fertigation–irrigation schedules were combined to realise a total of eight treatments: N0I1, N0I3, N100F1, N100F3, N100F1+I2, N300F1, N300F3, and N300F1+I2 (Table 1). All treatments received the same weekly water volume based on crop ETc estimated by the Penman–Monteith equation. We performed fortnightly measurements of crop growth and N accumulation, weekly measurements of NO3-N concentration in soil solution taken from suction lysimeters at depth of 0.6m, and a post-harvest measurement of soil mineral N content. At the highest N rate, a high frequency of Fertigation and/or irrigation increased the uptake of fertiliser-N, guaranteed optimal crop N nutritional status even in the early stages and promoted crop growth but did not significantly affect fruit yield. Compared to Fertigation frequency, irrigation frequency seems to be the main factor affecting N recovery at high fertiliser-N rate. Thus, high Fertigation and/or irrigation frequency may represent a strategy to increase N uptake efficiency in processing tomato fed with very high N and water supply, which is often the case in intensive processing tomato production.
Maryam Navabian - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of Fertigation management impacts of surface drip irrigation on reducing nitrate leaching using numerical modeling.
Environmental science and pollution research international, 2019Co-Authors: Nasrin Azad, Javad Behmanesh, Vahid Rezaverdinejad, Fariborz Abbasi, Maryam NavabianAbstract:The objective of this study was to investigate the impacts of Fertigation strategies on nitrate leaching and its uptake into maize plants. Field experimental data were employed to calibrate a numerical model (HYDRUS 2D/3D) for a surface drip irrigation system in a sandy clay loam soil. The calibrated model was used to simulate nitrate plant uptake and its leaching in different Fertigation scenarios based on various Fertigation durations and different start times of Fertigation. Finally, nitrogen plant uptake was compared with maize N requirement during growth stages in two Fertigation frequency scenarios. These simulations were also performed in sandy loam soil. The results show that, if Fertigation is done at the end of irrigation, nitrate leaching in shorter Fertigation duration will be less than the leaching in longer Fertigation duration. However, in the case of Fertigation at the beginning of irrigation, the nitrate leaching is higher if the Fertigation duration is short, and vice versa. Furthermore, reducing the number of Fertigation events in the sandy clay loam soil increases the nitrate plant uptake. However, in the sandy loam soil, a lesser number of Fertigation events reduce nitrate uptake.
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simulation of 1d surface and 2d subsurface water flow and nitrate transport in alternate and conventional furrow Fertigation
Irrigation Science, 2013Co-Authors: Hamed Ebrahimian, Fariborz Abbasi, Abdolmajid Liaghat, Masoud Parsinejad, E Playan, Maryam NavabianAbstract:Increasing water and fertilizer productivity stands as a relevant challenge for sustainable agriculture. Alternate furrow irrigation and surface Fertigation have long been identified as water and fertilizer conserving techniques in agricultural lands. The objective of this study was to simulate water flow and fertilizer transport in the soil surface and in the soil profile for variable and fixed alternate furrow Fertigation and for conventional furrow Fertigation. An experimental data set was used to calibrate and validate two simulation models: a 1D surface Fertigation model and the 2D subsurface water and solute transfer model HYDRUS-2D. Both models were combined to simulate the Fertigation process in furrow irrigation. The surface Fertigation model could successfully simulate runoff discharge and nitrate concentration for all irrigation treatments. Six soil hydraulic and solute transport parameters were inversely estimated using the Levenberg–Marquardt optimization technique. The outcome of this process calibrated HYDRUS-2D to the observed field data. HYDRUS-2D was run in validation mode, simulating water content and nitrate concentration in the soil profiles of the wet furrows, ridges and dry furrows at the upstream, middle and downstream parts of the experimental field. This model produced adequate agreement between measured and predicted soil water content and nitrate concentration. The combined model stands as a valuable tool to better design and manage Fertigation in alternate and conventional furrow irrigation.
S.s Hebbar - One of the best experts on this subject based on the ideXlab platform.
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Studies on NPK drip Fertigation in field grown tomato (Lycopersicon esculentum Mill.)
European Journal of Agronomy, 2004Co-Authors: S.s Hebbar, B.k Ramachandrappa, H.v Nanjappa, M PrabhakarAbstract:Abstract A field experiment was conducted during the summer seasons of 1999–2000 and 2000–2001 at the Main Research Station, University of Agricultural Sciences, Hebbal, Bangalore to study the effect of Fertigation with sources and levels of fertilizer and methods of fertilizer application on growth, yield and fertilizer-use efficiency of hybrid tomato in red sandy loam soil. There were eight treatments including furrow-irrigated and drip-irrigated controls, which was replicated three times. The investigations revealed that the total dry matter (TDM) production and leaf area index (LAI) were significantly higher in drip irrigation (165.8 g and 3.12, respectively) over furrow irrigation (140.2 g and 2.25, respectively). Water-soluble fertilizer (WSF) Fertigation recorded significantly higher total dry matter and LAI (181.9 g and 3.69, respectively) over drip irrigation. Chlorophyll concentration was significantly higher in Fertigation treatments over soil applied treatments at 90 DAT. The fruit yield of tomato was 19.9% higher in drip irrigation (71.9 Mg ha −1 ) over furrow irrigation (59.50 Mg ha −1 ). Fertigation with 100% WSF increased the fruit yield significantly (79.2 Mg ha −1 ) over furrow-irrigated control and drip irrigation. Subsurface drip Fertigation (76.55 Mg ha −1 ), nitrogen–potassium Fertigation (76.57 Mg ha −1 ) and 1/2 soil–1/2 Fertigation (76.51 Mg ha −1 ) had given fruit yields similar to WSF Fertigation. Significant yield reduction was recorded with 75% rate Fertigation (72.7 Mg ha −1 ) and normal fertilizer Fertigation (73.27 Mg ha −1 ) compared to WSF Fertigation. WSF Fertigation recorded significantly higher number of fruits per plant (56.9) and fertilizer-use efficiency (226.48 kg yield kg −1 NPK) compared to drip- and furrow-irrigated controls. Fertigation resulted in lesser leaching of NO 3 -N and K to deeper layer of soil. Subsurface drip Fertigation caused higher assimilable P in deeper layer. Root growth and NPK uptake was increased by WSF Fertigation.
Neelam Patel - One of the best experts on this subject based on the ideXlab platform.
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Water and nitrate dynamics in baby corn (Zea mays L.) under different Fertigation frequencies and operating pressures in semi-arid region of India
Agricultural Water Management, 2015Co-Authors: Mukesh Kumar, T.b.s. Rajput, Rohitashw Kumar, Neelam PatelAbstract:Improved water use efficiency, under drip irrigation is reduce percolation and evaporation losses, and provides for environmentally safer fertilizer application through irrigation water in the vicinity of the root zone. The present study was conducted at Water Technology Centre (WTC), Indian Agricultural Research Institute (IARI), New Delhi, India to investigate the impact of Fertigation frequency and system operating pressure on the dynamics of NO3-N in the soil root system of baby corn. The study was conducted during the year 2010–11 for three consecutive seasons consisted of nine treatments which included three system operating pressures (0.5kgcm−2, 1.0kgcm−2 and 1.5kgcm−2) and three Fertigation frequencies (biweekly, weekly and fortnightly). Higher NO3-N content was found at surface soil (0–15cm soil depth) in all the treatments. During initial and developmental stages, total applied nitrogen per Fertigation was not fully utilized by plants especially in fortnightly Fertigation at 1.0kgcm−2 system operating pressure resulting in increase in NO3-N content at 0–30cm soil depth. At maturity stage, when Fertigation was over, NO3-N present in 0–30cm soil depth leached up to 45cm soil depth and rest of soil profile remained practically unchanged in its content. NO3-N in lower soil profiles (30–60cm soil depth) was marginally affected in biweekly and weekly Fertigation frequency schedule. Fluctuations of NO3-N content at all the depths were more in fortnightly Fertigation frequency schedule. Yield attributes of baby corn were significantly affected by Fertigation at different system operating pressures.
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Water and nitrate movement in drip-irrigated onion under Fertigation and irrigation treatments
Agricultural Water Management, 2006Co-Authors: T.b.s. Rajput, Neelam PatelAbstract:Abstract Frequent Fertigation of crops is often advocated in the technical and popular literature, but there is limited evidence of the benefits of high-frequency Fertigation. Field experiments were conducted on an Indo-American Hybrid var., Creole Red, of onion crop during three winter seasons of 1999–2000 through 2001–2002 in coarse-textured soil of Delhi under the semi-arid region of India. Three irrigation levels of 60, 80 and 100% of the crop evapotranspiration (ET) and four Fertigation frequencies of daily, alternate day, weekly and monthly comprised the Fertigation treatment. Analysis of soil samples indicated considerable influence of Fertigation frequency on NO 3 -N distribution in soil profile. NO 3 -N in lower soil profiles (30.0–60.0 cm soil depth) was marginally affected in daily, alternate day and weekly Fertigation. However, fluctuations of NO 3 -N content in 0.0–15.0, 15.0–30.0, 30.0–45.0 and 45.0–60.0 cm soil depth was more in monthly Fertigation frequency. The level of soil NO 3 -N after the crop season shows that more NO 3 -N leached through the soil profile in monthly Fertigation frequency. Amounts of irrigation water applied in three irrigation treatments proved to be too small to cause significant differences in the content of NO 3 -N leached beyond rooting depth of onion. Yield of onion was not significantly affected in daily, alternate day and weekly Fertigation, though there was a trend of lower yields with monthly Fertigation. The highest yield was recorded in daily Fertigation (28.74 t ha −1 ) followed by alternate day Fertigation (28.4 t ha −1 ). Lowest yield was recorded in monthly Fertigation frequency (21.4 t ha −1 ). Application of 56.4 cm irrigation water and 3.4 kg ha −1 urea per Fertigation (daily) resulted in highest yield of onion with less leaching of NO 3 -N.
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Effect of Fertigation frequency on onion (Allium cepa) yield and soil nitrate-nitrogen
Indian Journal of Agricultural Sciences, 2005Co-Authors: Neelam Patel, T.b.s. RajputAbstract:A field experiment was conducted during 3-winter seasons of 2001-2002 through 2003-2004 to study the effect of Fertigation daily, alternate day, weekly and monthly on an Indo-American hybrid 'Creole Red' of onion (Allium cepa L.) crop and NO 3 -N of soil. Analysis of soil samples indicated considerable influence of Fertigation frequency on NO 3 -N distribution in soil profile. The NO 3 -N in lower soil profiles (30-60 cm soil depth) was marginally affected in daily, alternate day and weekly Fertigation 41.9, 42.0, 43.6 ppm, respectively. However, fluctuations of NO 3 -N concentration in 0-15 cm, 15.0-30 cm, 30-45 cm and 45-60 cm soil depth was more in monthly Fertigation frequency. After the crop season 29.85% NO 3 -N was leached through the profile in monthly Fertigation. Daily, alternate day and weekly Fertigation did not significantly affect yield of onion, 29.2 tonnes/ha, 28.0 tonnes/ha, 27.4 tonnes/ha respectively. The highest yield was recorded in daily Fertigation (29.2 tonnes/ha) followed by alternate day Fertigation (28 tonnes/ha) while the lowest in monthly Fertigation (22.4 tonnes/ha). Application of 57.7 cm irrigation water and 3.4 kg/ha urea in daily Fertigation resulted in maximum yield of onion (29.2 tonnes/ha) with least amount of leaching of NO 3 -N (23%).