特早熟夏玉米不同时期追施氮磷钾三要素吸收与分配

本文研究了山西省晋中盆地麦收后直播特早熟夏玉米冀承单 3号 ,不同时期追肥对氮、磷、钾三要素吸收与分配的影响。结果表明 ,三要素的吸收数量和平均吸收强度均以大喇叭口期追肥为高 ;追肥时期不影响三要素的吸收趋势 ,氮、磷的吸收趋势均符合Logistic曲线 ,钾的吸收均符合一元三次曲线 ,且吸收强度均出现两个高峰 ,但大口期追肥处理则使氮、磷的第二个吸收高峰推迟出现。成熟期 ,氮多集中于籽粒中 ,钾多分布于秸秆中。特早熟夏玉米每生产百千克籽粒需吸收氮 3 2 6～ 3 33 ,五氧化二磷 1 84～ 2 33 ,氧化钾 5 1 8～ 5 1 9 。

Absorption and Distribution of the Three Main Elements in Especial-early Summer Corn at Different Top Dressing Times

The paper studies the absorption and distribution of N、P and K by especial-early summer corn, Jichengdan No.3, under two kinds of top dressing times in Jinzhong basin. The results showed that the amounts and the rates of absorbing N、P and K was bigger top dressing at the 9th spreading-leaf, while the trends weren't affected by top dressing times, and the accumulation rates appeared two peaks. But the second peaks of absorbing N\,P were delayed by top dressing at the 9th spreading-leaf. At the period mature, more N is in grains, and more K plants. The requirements of N\,P\-2O\-5, and K\-2O were 3\^26～3\^33 , 1\^84～2\^33 , and 5\^18～5\^59  respectively in order to gain 100  grain yield for the especial-early summer corn.