大豆不同品种类型对播期及密度的反应

选取结荚习性、分枝性不同的四个品种为试材,采用二因素最优化设计,进行了品种、播期、密度的综合试验,并建立了数学模型。 结果表明:各类型品种在同一地区种植均可获得高产,但需配有相应的最佳栽培模式;播期与密度对产量影响均较大。播期早晚主要影响花前期长短,进而影响产量。无限型品种适宜的密度较低且范围较窄;分枝性强的有限型品种,适宜密度较高,范围较宽;独秆型品种则要求密度高,范围最窄。产量与单位面积总荚数相关最为密切(r=0.934),每平方米总荚数高于700,可获得每亩高于150公斤的产量。

RESPONSE OF DIFF ERENT TYPE OF SOYBEAN CULTIVARS TO THE PLANTING DATE AND DENSITY

To study the effects of planting date and density on yield of soybean, 4 cultivars, Jindou 2 (DT. branch), Jindou 5 (INDT. branchy), Jindou 6 (INDT. branchless) and Jindou 8 (INDT) were planted on 4 dates from 26th, April to 24th, May and on 4 density from 8000 to 18000 plants per mu, with the design of optimum of two factors. The mathematical models for high yield was established. The results shown that each type of cultivar can produce higher seed yield with specific culture schemes. Planting date and density are fators affectting seed yield. The effect of planting date was through changes of time from plantting flowering. The cultivars differing in growth and branch habit vary in response to density. INDT and branchy type produce higher yield in lower density and within limited density range, DT, and branchy type in higher density and within large range, and branchless type in more limited density range. The seed yields were significantly increased with increasing pod number per unit area (r = 0. 934). The pod number can be taken as indecator of designing yield model in specific region; >700 pods per m2 may produce yield > 150kg per mu.