【摘要】 <正> 大豆“长农4号”是生产上推广的主要良种之一,为了给生产上提供配套的综合栽培技术,使良种良法密切结合,1987～1989年在四平地区中等肥力土壤上进行了种植密度、尿素、三料磷肥、氯化钾施用量等栽培措施优化研究。根据试验产量结果,通过微机计算,更多还原

【Abstract】 The relation of seed yield with different agricultural practices composition for "Changnong No. 4" c. v were studied by using second-degree polynomial regression analysis and orthogonal rotation design. The exprimental results showed that 1. the yield of 160 kg/mu or above could be obtained by means of plant density 10000plant/mu, with applying Urea 3. 0-6. 0kg/mu, 3Ca (H2PO4)2 · H2O 10kg/mu, KCl 1. 5-3. 0kg/mu. 2. plant density was a vital agricultural factor for soybean high yield. Application of Urea and KCl were importent for further high yield-Applying 3Ca(H2PO4)2 · H4O worked less in the place. 3. when the applying amount of Urea was 4. 5kg/mu, 3Ca(H2PO4)2 · H2O 10kg/mu, KCk 3.0kg/mu, the best economical effect of applying fertilizer could be obtained.The results was obtained under medium soil fertility condition in Shiping Region Jiling province.更多还原