大豆-玉米轮作区适宜NPK用量试验研究

通过连续多年的小区定位试验,采用NPK三因素多水平的不完全设计,在12个不同NPK用量的配方中筛选出适合本地区大豆-玉米轮作条件下的适宜肥料用量。由于每小区包含有连续多年的肥料效应,理论上可提供更多的养分信息,生产实践上更为实用。初步研究结果表明:大豆施氮不同用量之间,增产效果有明显的不同,大豆对氮的需求量增高,目前黑土区大豆生产需要有更多的氮素供应。大豆适宜施氮量为45 kg hm-2~60 kg hm-2;玉米适宜施氮量为166 kghm-2。施磷不同用量之间,增产效果无明显差别。由于磷素的土壤积累,磷肥增产作用已经明显低于上世纪80年代,大豆、玉米对施磷的需求量降低,但氮素对磷素有显著的协助作用,施氮能显著促进作物对磷的吸收。

The Research on Optimal NPK Dosage in Soybean - Corn Rotation System

We selected apt NPK dosages through a long-term continuous field test,which was based on twelve levels of fertilizer amaunts in soybean-corn rotation fileld.The result showed: the increase production effect was different among the treatment groups.Because the Nitrogen requirement for soybean growth was increased with time,so the amount of nitrogen for soybean was 45-60 kg hm~(-2).The amount of nitrogen for corn was 166 kg hm~(-2).It was not distinct ly difference among the different phosphoric treatment groups.The role of phosphoric fertilizer to increase production decreased since 1980's.Soybean and corn requirements for phosphoric fertilizer were decreased,and nitrogen had assistance role to promote phosphoric absorb tion.