大豆品种及播期对套作大豆产量的影响

在甘肃中部沿黄灌区早熟马铃薯套作大豆模式下，研究了不同品种与播期对套作大豆产量的影响。结果表明，大豆品种间产量差异极显著，以晚熟大豆品种的产量最高，达2553.15 kg/hm2，中熟品种次之，早熟品种最低；与早中熟大豆品种比较，晚熟品种与早熟马铃薯的生殖共生期较短，分枝数、主茎节数、单株有效荚数和单株粒数较多，适合套作。播期间产量也有差异，播期为4月30日时产量最高。中晚熟大豆品种的适宜播期为4月30日，播期为5月10日的早熟品种产量较高。

Effect of Different Varieties and Sowing Dates on the Yield of Early Potato Intercropping Soybean

The effect of different varieties and sowing dates on the yield in early potato intercropping soybean was studied in Gansu irrigation areas along Yellow River . The results indicated that the yield among three varieties was the most significantly different,the yield of late maturing variety was the highest,which reached 2 553.15 kg/hm2,and that of mid-maturing variety took second place,that of early maturing variety was the lowest.Compared with early maturing variety and mid-maturing variety,the symbiotic period of reproductive growth with early potato was short,the branch number increased,the number of stem node increased,the pod number per plant and seed number per plant was much higher. Therefore,the late maturing variety was suitable to intercrop . The yield among sowing dates was also significantly different,the best sowing date was April 30 . As the variety was different,it＇s performance under different sowing dates was slightly different . The optimum sowing date of mid-maturing variety and late maturing variety was April 30,the optimum sowing date of early maturing variety was May 10 .