Modelling and Simulation of Nutrient Release from Neem (Azadirachta Indica) Oil Coated Urea

S. Meena, M. Vashishtha, Ankush Meena
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引用次数: 2

Abstract

Urea is an important Nitrogenous fertilizer. However, uncoated Urea when applied to crops is prone to nutrient losses due to run off, volatilisation and leaching. Answer to this problem lies in application of controlled release urea which plays a dual role of enhancing nitrogen use efficiency by plants leading to improved crop yields and also controls environmental pollution by reducing hazardous gaseous emissions and water eutrophication. The present study aims to model and simulate the nutrient release from urea coated with Neem (Azadirachta indica) oil coating (NCU) unveiling the three stages of nutrient release as explained in literature for other coated fertilizers. Multi diffusion model is developed for multilayer including the Neem Oil coating, water domain and couples the Finite element approximation with 2D geometry, to improve the accuracy of simulation urea diffusivity in water is taken as a function of its concentration. The simulation results agree well with the experimental data with standard error of estimate varying from 0.016 to 0.023. The model not only predicted nutrient release from NCU but also described the internal release mechanism from the core to coating interface and coating interface to water environment. The model was also validated with experimental results for urea coated with other materials also differing from NCU in core and coating thickness.
印楝油包覆尿素中养分释放的建模与模拟
尿素是一种重要的氮肥。然而,未包膜尿素在施用于作物时,由于径流、挥发和淋滤,容易造成养分损失。这一问题的答案在于控释尿素的应用,它具有提高植物氮素利用效率从而提高作物产量和通过减少有害气体排放和水体富营养化来控制环境污染的双重作用。本研究旨在模拟印度楝油包衣(NCU)包衣尿素的养分释放过程,揭示其他包衣肥料中养分释放的三个阶段。为了提高模拟的准确性,建立了包括印楝油涂层在内的多层水域的多重扩散模型,并将有限元逼近与二维几何耦合,将尿素在水中的扩散率作为其浓度的函数。仿真结果与实验数据吻合较好,估计的标准误差在0.016 ~ 0.023之间。该模型不仅预测了NCU的养分释放,还描述了从核心到涂层界面、涂层界面到水环境的内部释放机制。对尿素包覆其他材料的实验结果进行了验证,这些材料的包覆厚度和包覆芯数也与NCU不同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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