作物营养需求

试验前后土壤有效硫的变化进一步说明施用硫肥可以维持土壤硫素平衡，满足作物营养需求。

It was necessary to fertilize S which can maintain the balance of S in soils , and meet the plants needed .

以磷石膏和氮肥为主要原料，制备能根据作物营养需求控制氮素释放的磷石膏基硫氮肥。

Phosphogypsum-based sulphur-nitrogen fertilizer , which could control the nitrogen release according to the crop nutrient requirement , was prepared from phosphogypsum and general fertilizer ( ammonium bicarbonate and urea ) as the material .

化肥生产企业根据土壤养分及作物营养需求开发研制价格适宜、配方合理的补钾专用肥，满足平衡施肥的需要。

According to soil nutrients and nutritional requirements of crops , the chemical fertilizer production enterprises have developed and produced potassium sulfate-type special fertilizer for vegetables with suitable prices and rational formulae , which can satisfy the balanced fertilization .

根据果蔬作物的营养需求特点研制的专用配方复混肥，适应了果蔬作物高产高效生长发育的营养平衡需求，获得了显著的增产效果和较好的经济效益，作物品质得到了良好的改善；

The specific compound fertilizer was developed according to the nutrient requirement of fruit and vegetable , which met not only nutritional balanced demand for fruit and vegetable crop for high yield and growth , but also significantly increased yield , economic and quality .