摘要
采用施肥比例试验和施肥量试验统一在同一试验中的研究方法 ,对土壤养分类型及其施肥比例变化规律等进行了研究。结果表明 ,在把土壤和作物结合起来考虑时 ,作物苗期土壤供肥存在平衡与不平衡养分类型 ,并具有特定施肥比例。在此条件下 ,在极点施肥量范围内 ,作物产量随施肥量的增加呈线性增加 ,极点施肥量后产量开始降低。
Fertilizer application amount experiment and fertilizer application ratio experiment were combined to study nutrient types and the changing rule of application ratio. The study showed when considering soil and crop at the same time, there exists balanced nutrient type or unbalance nutrient type for fertilizer supply during seedling period of crops as well as specific application ratio. Below the application amount at pole, crop yield increased linearly with increased application amount and when reaching the amount at pole, it began to decrease. Its functional diagram was a reversed one, not the traditional one. at the polar amount, the traditional decreasing returns rate did not work., the optimum application amount and polar application amount were unified. Based on the study, we develop a theory of nutrient balance at polar point and the new concept of once-for-all fertilizer application before sowing.
出处
《山西农业科学》
2002年第3期25-28,共4页
Journal of Shanxi Agricultural Sciences
