The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Bruno Gerard - One of the best experts on this subject based on the ideXlab platform.
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nutrient management and use efficiency in wheat systems of south asia
Advances in Agronomy, 2014Co-Authors: Bruno GerardAbstract:Abstract With the advent of Green Revolution era in the mid-1960s, high-yielding wheat ( Triticum aestivum L.) varieties and chemical Fertilizers were introduced in South Asia. Fertilizer consumption is continuously increasing since then, but the productivity of wheat is relatively stagnant during the last decade. In South Asia, Fertilizers have been applied to wheat as blanket recommendations for regions with similar climate and landform. There exists a large variation in nutrient use efficiencies in wheat because of following blanket recommendations for nitrogen, phosphorus, and Potassium in fields differing greatly in nutrient-supplying capacity of the soil. Research carried out in South Asia suggests that further improvement in nutrient use efficiency will become possible by balanced use of nitrogen, phosphorus, and Potassium Fertilizers, and by rational use of organic manures in wheat systems. Long-term fertility experiments also confirm the need of balanced use of nutrients to produce high sustainable yield levels of wheat. In saline alkali soils, wheat needs to be supplied with higher amounts of nutrients, particularly N, than in normal soils. Band placement of Fertilizers, particularly phosphorus, leads to improved fertilizer use efficiency, but appropriate machinery is lacking. Recently introduced site-specific nutrient management strategies for wheat take into account field-to-field variability and can help increase fertilizer use efficiency more than that achieved by following blanket fertilizer recommendations. Conservation agricultural practices consisting of reduced tillage and residue retention in wheat fields have already been introduced in South Asia. Nutrient management strategies for these wheat-growing environments are also being actively worked out. Yield gap analysis shows that productivity of wheat as well as nutrient use efficiencies can be further improved.
Guo Quanzhong - One of the best experts on this subject based on the ideXlab platform.
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effects of Potassium fertilizer on the yield quality and economic benefits of protected vegetables in ankang city
Journal of Anhui Agricultural Sciences, 2008Co-Authors: Guo QuanzhongAbstract:[Objective]The research aimed to solve the unreasonable fertilization problem in the protected vegetable cultivation in Ankang city.[Method]According to the fertilization status of the protected tomato cultivation in Ankang city,the Potassium fertilizer with different amount was applied to study the effects of Potassium fertilizer on the yield,quality and economic benefits of tomato.[Result]Under the conditions of the same application amount of nitrogen and Potassium Fertilizers,the yield and the economic benefits of tomato were increased with the increasing of the application amount of Potassium fertilizer.When the application amount of Potassium fertilizer was 180 kg/hm2,the average yield of tomato was 86 000 kg/hm2,being 50.9% higher than that of treatment without Potassium fertilizer,and the yield increase for unit Potassium fertilizer cost was 80.6 kg/yuan.Adding the application of Potassium fertilizer could enhance the yield and economic benefits of tomato significantly,increase the soluble sugar content of tomato,lower the acidity and improve the tomato quality.[Conclusion]The application amount of Potassium fertilizer should be appropriately added in the production of protected vegetable in Ankang city.
Andrew F Smith - One of the best experts on this subject based on the ideXlab platform.
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effects of forms and rates of Potassium Fertilizers on cadmium uptake by two cultivars of spring wheat triticum aestivum l
Environment International, 2004Co-Authors: Zhongqiu Zhao, Huiying Li, Sally E Smith, Andrew F SmithAbstract:A greenhouse pot experiment was conducted to study the influence of Potassium Fertilizers in different forms and rates on cadmium (Cd) uptake by two cultivars of spring wheat (Triticum aestivum, L.): Brookton and Krichauff. Potassium Fertilizers were added to soil at four levels: 0, 55, 110 and 166 mg K kg−1 soil as KNO3 (N), KCl (C) or K2SO4 (S). CdCl2 was added to all the treatments at a uniform rate equivalent to 15 mg Cd kg−1 soil. Plant shoot and root dry weights (DW) of both cultivars were reduced significantly by the addition of K-fertilizer in C and S treatments but there were only marginal changes in the N treatments. The Cd concentrations in shoots and whole plants increased significantly (P<.001) with increasing K addition, from 37.5 to 81.4 mg kg−1 and from 42.9 to 86.8 mg kg−1 for Brookton and Krichauff, respectively. However, no obvious effect was observed in the N treatments, except for the highest K level (K3) where there was a sharp increase in Cd concentration compared to the lower additions. Forms of K-Fertilizers significantly influenced the Cd concentrations in plant shoots and roots (P<.001), but there was no significant difference between C and S treatments. This experiment showed that anions Cl− and SO42− increase Cd uptake by plants, which can be interpreted as Cl− and SO42− complexing readily with Cd2+ and thereby increasing the bioavailability of Cd2+ in soils. The effect of Potassium itself on plant uptake of Cd was also observed. We suggest that when applying Potassium fertilizer to Cd-contaminated soils, the forms and rates should be considered.
Huiying Li - One of the best experts on this subject based on the ideXlab platform.
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effects of forms and rates of Potassium Fertilizers on cadmium uptake by two cultivars of spring wheat triticum aestivum l
Environment International, 2004Co-Authors: Zhongqiu Zhao, Huiying Li, Sally E Smith, Andrew F SmithAbstract:A greenhouse pot experiment was conducted to study the influence of Potassium Fertilizers in different forms and rates on cadmium (Cd) uptake by two cultivars of spring wheat (Triticum aestivum, L.): Brookton and Krichauff. Potassium Fertilizers were added to soil at four levels: 0, 55, 110 and 166 mg K kg−1 soil as KNO3 (N), KCl (C) or K2SO4 (S). CdCl2 was added to all the treatments at a uniform rate equivalent to 15 mg Cd kg−1 soil. Plant shoot and root dry weights (DW) of both cultivars were reduced significantly by the addition of K-fertilizer in C and S treatments but there were only marginal changes in the N treatments. The Cd concentrations in shoots and whole plants increased significantly (P<.001) with increasing K addition, from 37.5 to 81.4 mg kg−1 and from 42.9 to 86.8 mg kg−1 for Brookton and Krichauff, respectively. However, no obvious effect was observed in the N treatments, except for the highest K level (K3) where there was a sharp increase in Cd concentration compared to the lower additions. Forms of K-Fertilizers significantly influenced the Cd concentrations in plant shoots and roots (P<.001), but there was no significant difference between C and S treatments. This experiment showed that anions Cl− and SO42− increase Cd uptake by plants, which can be interpreted as Cl− and SO42− complexing readily with Cd2+ and thereby increasing the bioavailability of Cd2+ in soils. The effect of Potassium itself on plant uptake of Cd was also observed. We suggest that when applying Potassium fertilizer to Cd-contaminated soils, the forms and rates should be considered.
M L Segura - One of the best experts on this subject based on the ideXlab platform.
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reuse of tertiary municipal wastewater effluent for irrigation of cucumis melo l
Irrigation Science, 2013Co-Authors: S Martinez, R Suay, J Moreno, M L SeguraAbstract:The reuse of tertiary wastewater for crop irrigation presents itself as an alternative to the scarcity of quality water suffered by many countries in the Mediterranean region. Furthermore, this resource can provide an important saving of Fertilizers as well as benefits to the environment, as it avoids the discharge of contaminated water into public waterways. This study focuses on the effect of irrigation with ozonized wastewater on the melon crop. In this study, melon crops were irrigated with either ozonized wastewater or ground water commonly used in the agricultural area (control treatment). Fertigation, by means of drip irrigation, was delivered according to the crop’s needs, evaluating the Fertilizers contributed by each of the waters and that added in mineral form. Throughout the crop’s development, the characteristics of the water, soil and plant (leaf and fruit) were studied from a chemical, physicochemical and microbiological perspective. The results obtained show that irrigation with ozonized wastewater, in these conditions of crop growth, produces similar effects as ground water on the soil properties, on the concentration of macroelements in the leaf and fruit and on the yield of melon fruit. Furthermore, the reuse of this effluent leads to a greater saving in nitrogenous and Potassium Fertilizers compared to fertigation of the crop with ground water.