The old calculation formula for fertilizer requirement did not fit to fertilizer requirement.
原需肥量计算公式纯粹是利用率不妥计算的逆运算。
There was a range for parameters of fertilizer requirement, so it should be adjusted according to soil fertility and yield.
需肥量参数具有较大幅度的变化，应按照土壤肥力以及产量目标来合理调整并确定这个重要参数。
Based on the present status of decreasing marketing in chemical fertilizer, a primary prediction of fertilizer requirement in future 5~15 years is made at home and abroad.
分析国内外化肥市场销量下降的原因，介绍有关部门对今后5～15年国内外需求量的初步预测。
The reasons of low use efficiency of fertilizer and serious pollution are the imbalance between fertilizer releasing nutrient and crop requirement.
化肥利用率低和污染严重的主要根源是因肥料释放的养分与作物需求间不平衡所致。
This algorithm fits both the principle for fertilizer according to the crop characteristics, soil type, the fertilizer characteristics, and the requirement of the lowest price.
该算法既满足根据作物的特点、土壤类型、肥料本身的特性确定施用肥料的原则，又满足价格最低的要求。
The requirement of community cultivation on community compound fertilizer are analyzed, several formulae of the community compound fertilizer are presented.
提出群落栽培对群落复混肥研制的要求，介绍群落复混肥的配方实例。
Presented the process flow and BFW system of ammonia plant in Jilin Chemical Fertilizer Factory, analyzed the problem of the BFW system, proposed revamp plan and technical requirement.
介绍了中国石油吉林石化公司化肥厂合成氨装置的生产工艺和锅炉给水系统流程，分析了锅炉给水系统存在的问题，提出了改造方案和技术要求；
According to the experimental data in the paper, the isothermal phosphate adsorption curves of soils could be used for predicting the requirement of phosphorus fertilizer for soils.
根据本试验数据，土壤对磷的等温吸附曲线可以用来预测土壤需磷量。
According to the experimental data in the paper, the isothermal phosphate adsorption curves of soils could be used for predicting the requirement of phosphorus fertilizer for soils.
根据本试验数据，土壤对磷的等温吸附曲线可以用来预测土壤需磷量。
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