摘要
研究了特早熟夏玉米冀承单 3号的密度效应 ,结果表明 :(a)生物产量—密度方程呈渐近线型 ;经济系数—密度方程呈指数下降型。 (b)密度在 7 5万株 /h ,最大LAI在 3左右 ,成熟期LAI在 2 35左右 ,出苗—吐丝LAD在 5 4 3万 ·d/h ,吐丝—成熟LAD在 1 1 4 9万 ·d/h ,平均NAR在 8 2 4g/ ·d ,源库比在 0 0 5 5 ,经济系数 0 3左右时 ,为最佳群体结构 ,单产可达 5 0 2 5kg/h 。
In this paper, we study density effects on especial —early summer corn, jichengdan 3. The results show that: (a) Biological yield —density assume asymptote model ;economic coefficient —density ,exponential decay curve.(b)At the density of 75 000 plants/h , the most LAI was about 3 and at mature it was about 2.35,LAD was about 543 000 ·d/ h from emergence to spin and 1 149 000 ·d/h from spin to mature, the average NAR was 8 24 g/ ·d, source—sink ratio was 0 055 and economic coefficient ,about 0 3. Those conditions constituted the best population structure, with the yield of 5 025 /h.
