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采用5因素二次正交旋转组合设计试验方法,研究了夏大豆3750kg/hm2以上产量的综合技术措施与应用效果。结果表明,在6月5至30日播期范围内,商豆1099产量显著高于郑9007大豆品种;每晚播1d,夏大豆减产约66~70kg/hm2;在该试验条件下,6月15日为夏大豆适播期下限。在适播期范围内,达到3750kg/hm2以上产量水平的优化农艺措施指标为:氮肥(N)62.4~74.0kg/hm2、磷肥(P2O5)109.2~129.5kg/hm2、钾肥(K2O)78.0~92.5kg/hm2,其施用比例约为1∶1.75∶1.25;种植密度19.2~19.9万株/hm2;应用多效唑1818~1980g/hm2;灌溉时间7月28日至8月1日;叶面喷施硼砂1338~1542g/hm2。优化栽培比常规栽培增产16.0%~22.4%,增产效果十分显著。
A 5-factor quadratic orthogonal rotation combined design test method was used to study the comprehensive technical measures and application effects of summer soybean yield above 3750kg / hm2. The results showed that the yield of 1099 was significantly higher than that of Zheng 9007 during the sowing period from June 5 to June 30; the yield of summer soybean was about 66 ~ 70 kg / hm 2 after sowing for 1d every night; in this experiment, 15th for summer soybean sowing period limit. Within the range of suitable sowing date, the indicators of optimized agronomic practices that reached the level of above 3750kg / hm2 were: 62.4-74.0kg / hm2 of N fertilizer, 109.2-129.5kg / hm2 of P2O5, 78.0-92.5% of K2O, kg / hm2, the application rate of about 1: 1.75: 1.25; planting density of 19.2 to 199,000 plants / hm2; application of paclobutrazol 1818 ~ 1980g / hm2; irrigation time from July 28 to August 1; foliar application of borax 1338 ~ 1542g / hm2. Optimum cultivation increased 16.0% ~ 22.4% than conventional cultivation, and the yield increase effect was very significant.