摘要
以 1季作物生产为基本单元 ,在单养分限制模型基础上 ,根据限制—稀释假定 ,建立了多养分综合作用下的作物氮磷钾吸收—供应关系模型。用有效化指数将施用的磷钾肥换算为土壤有效养分作为养分供应能力的指标。提出养分综合利用效率的概念与计算方法。图 2 ,参 19。
Bsaed non single nutrient limited models on relations of biomass,grain yield,nutrient uptakes by crops,nutrient contents in crop plants to initial soil nutrient and fertilizer application doses,the models on the relationship between nutrient uptake and nutrient supply were constructed under multi nutrient limited conditions.The fertilizer effectivebess index was defined to unify the effects of fertilization and soil nutrients on nutrient supplies.The comprehensive uptake efficiency of nitrogen,phosphorus and potassium was calculated as a main criterion of balance fertilization.
出处
《农业系统科学与综合研究》
CSCD
北大核心
2003年第1期71-74,共4页
System Sciemces and Comprehensive Studies In Agriculture
基金
国家"8 63"计划项目 ( 2 0 0 1AA115 42 0
2 0 0 1AA0 45 0 41)
国家自然科学基金重点项目 ( 3 0 0 3 0 0 90 )内容
