And study the nitrogenous fertilizerresponse trial, phosphorous fertilizerresponse trial, potassium fertilizerresponse trial and nitrogen, phosphorous, potassium nutrition balance separately.
分别从氮肥效应试验、磷肥效应试验、钾肥效应试验和氮磷钾养分平衡进行了研究。
2
The difference in the response of yield components to fertilizer among rice varietal types was studied.
研究了水稻品种类型间产量构成因素对肥力反应差异。
3
The quota system of competitiveness was established in response to the characteristic of phosphate fertilizer enterprises, and the mathematic model for quantitative assessment was put forward.