秋播甜玉米氮磷钾营养特点及施肥对其影响研究

摘 要：田间试验结果表明，甜玉米生长发育过程中，植株的P含量从苗期到收获基本没有明显变化而NK含量随着生长期后延不断下降，但NPK养分积累随生物量增加而不断增加。施用NK肥料显著提高植株NK含量和NPK吸收累积量，施P对提高植株P含量和累积量效果不明显。从苗期植株NK含量约6倍于收获期，吐丝到成熟收获期间NK吸收累积量出现突跃式增长的营养特点分析认为，甜玉米的苗期(6-10叶)和吐丝期是两个重要的营养敏感期，在优质丰产栽培技术中需提供充足的土壤养分供应。

Characteristics of NPK nutrition and as affected by fertilization for fall-sowing sweet corn

A field trial indicated that plant P content did not significantly change in all growth stages, while NK contents kept declining and NPK uptake kept increasing from early to late stages.Addition of NK fertilizers obviously plant NK contents and NPK uptake, however, addition of P did not significantly influence plant P content and uptake.Based on the fact that plant NK contents at seedling were about 6 times as those at harvesting, and launching of NK uptake occurred during silking, it is believed that the two stages should be the most sensitive nutrition periods for sweet corn production, thus demanding sufficient nutrition supply from the soil.