施肥深度对大豆氮磷钾吸收及产量的影响

采用分层施肥和15N示踪方法,研究施肥深度对大豆氮磷钾吸收及产量的影响,为大豆合理施肥深度的确定提供理论依据。研究表明,施肥深度对大豆前、中期植株干物质、氮磷钾的积累影响较大,而对植株成熟期影响较小;大豆苗期(V3)与种子同层施肥处理植株干物质和氮磷钾的积累量最大;盛花期(R2)以种下6cm处理效果最明显。施肥深度对大豆产量的影响也表现为种下6cm处理最高,但与种子同层施肥、种下12、18和24cm施肥处理差异不显著;施于种子同层至种下6cm最有利于大豆苗期氮肥吸收,表层施肥、种下24cm施肥处理氮肥吸收效果不好。

EFFECT OF FERTILIZATION DEPTH ON N,P,K ABSORPTION AND YIELD IN SOYBEAN

Layered fertilization and15N tracer method were applied to investigate,the experiment researched the effect of fertilization depth on N,P,K absorption and yield in soybean,which provides theoretical basis for the determination of reasonable fertilization depth.Affected the accumulation of N,P,K and plant dry matter in early and medium period than that in maturity period;in seedling stage(V3) the accumulation of plant dry matter and N,P,K were the largest which the fertilizer treatment was the same depth with seeds;At blooming stage(R2),the treatment of 6cm below the seeds was the most obvious.Effect of fertilization depth on yield also presented that the treatment of 6cm below the seeds was the largest,but not significant with the treatment of the same depth with seeds and 12,18 and 24cm below the seeds.Fertilization from the same depth with seeds to 6cm below the seeds was the most beneficial to absorption of nitrogen at seedling stage,surface fertilization and 24cm below seeds was the most unfavorable to absorption of nitrogen.