论文部分内容阅读
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。
Through years of plot positioning experiments and NPK three-factor multi-level incomplete design, 12 suitable NPK dosage formulations were screened for the appropriate amount of fertilizer suitable for soybean-corn rotation in this region. Since each plot contains many years of fertilizer effect, in theory, can provide more nutrients, production is more practical and practical. The preliminary results showed that there were obvious differences between different nitrogen application rates and yield increasing effects. The demand of nitrogen for soybean increased, so far more nitrogen supply was needed for soybean production in black soil area. The optimum nitrogen application rate was 45 kg hm-2 ~ 60 kg hm-2 for soybean and 166 kghm-2 for corn. Different amount of phosphorus application, no significant difference in yield. Due to the accumulation of soil phosphorus, the effect of increasing phosphorus fertilizer has been significantly lower than the 80s of last century, soybeans, maize to reduce the demand for phosphorus, but nitrogen has a significant role in helping phosphorus, nitrogen can significantly promote the crop phosphorus Absorption.