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Modeling of nitrogen leaching by using urea fertilizer in sandy loam soil

机译：含沙土土壤中尿素肥料氮浸出的建模

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To study of the N leaching process in sandy loam soil under drip irrigation system a full drip system was designed in Agricultural Research Farm, Shahrood Iran. Selected crop panted for study was radish. In this experiment the lateral lines were spaced at 50 cm interval. The lateral lines were laid in such a manner that the same lateral line supplied water and fertilizer to all the randomized replicated plots. Plant to plant and row to row spacing were 10 cm and 30 cm, respectively. The recommended dose of fertilizers were 120 kg/ha of N, 50 kg/ha of P and 70 kg/ha of K. In this study urea was main source of applied nitrogen. Amount of water applied during each irrigation varied with water requirement. Amount of nitrogen applied varied according to the crop requirement and fertigation schedule. Modeling of nitrogen leashing blow the crop root zone was done by Hydrus- 2D model. Amount of N going below the root zone depth was obtained by this model. Water and nitrogen patterns in the entire field described by analyzing the flow in the single volume element irrigated by single emitter. Simulation of nitrogen leaching was done in three types of soils. Results revealed that N leaching was highest in case of sandy loam soil and negligible in case of silty clay loam soil. This implies that in case of permeable soils like sandy loam, fertigation strategies play role in N leaching.
机译：在滴灌系统下，在农业研究农场设计了全滴水系统的砂土土壤中的N浸出过程，Shahrood Iran。选择的作物喘着粗地进行研究是萝卜。在该实验中，横向线间隔50cm间隔。以这样的方式铺设横向线，使得与所有随机复制的图相同的横向线提供水和肥料。植物到植物和行间距分别为10厘米，30厘米。推荐剂量的肥料为120kg / ha，N，50kg / ha的p和70kg / ha的K.在本研究中，尿素是施加氮的主要来源。每次灌溉过程中施加的水量随着水需求而变化。施用的氮气量根据作物需求和培养表而变化。氮腰侧吹吹的造型造型根区由氢化2D模型完成。通过该模型获得了下方的N下方的n的量。通过分析单个发射器灌注的单个体积元件中的流动描述的整个领域中的水和氮图案。氮浸出的仿真在三种类型的土壤中进行。结果表明，如果含沙土土壤的情况下，N次浸出是最高的，因为粉质泥土土壤的情况下可忽略不计。这意味着，如果砂土壤土这样的渗透性土壤，灌溉策略在N浸出中发挥作用。

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