需肥量

原需肥量计算公式纯粹是利用率不妥计算的逆运算。

The old calculation formula for fertilizer requirement did not fit to fertilizer requirement .

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。

There was a range for parameters of fertilizer requirement , so it should be adjusted according to soil fertility and yield .

保护地作物具有产量高、需肥量大等特点。

Crops in protected field possess the advantage of high yield , high fertilizer demand and so on .

该模型反映了作物产量、需肥量和土壤供肥量三者之间的关系。

The relationships among fertilizer requirements , crop yields and soil nutrient supplying amounts were established in the fertilization models .

常规设施栽培中，蔬菜养分投入量远高于其生长需肥量，过量施肥造成了土壤环境质量的恶化，影响农业设施栽培的可持续发展。

The fertilizer input in vegetables growth was far exceeded its necessary nutrient in conventional protected cultivation . As a result , soil quality degradation and prevented sustainable development of protected cultivation .

系统可针对不同的作物、不同地域、不同时期的气候与作物生长状况，判断农田土壤储水量是否下降至作物灌水的下限指标，根据作物需肥量，精确确定灌溉、施肥量；

According to different crop , different regions , climate and crop of different periods , the system can judge whether the amount of water stored of farmland and soil drops to the lower limit index that the crop pours water and confirm quantity of irrigation and fertilization .

施肥量对高产夏玉米需肥规律的影响原需肥量计算公式纯粹是利用率不妥计算的逆运算。

Effect of Rate of Applied Fertilizer on Fertilizer Requirement of High-yield Summer-sown Corn The old calculation formula for fertilizer requirement did not fit to fertilizer requirement .