不同品种及播期对丘区套作大豆产量的影响

在"麦/玉/豆"模式下,研究了不同品种与播期对丘区套作大豆产量的影响.结果表明,品种间产量差异极显著,以晚熟品种(贡选1号)的产量最高,达1375.11 kg/hm2,中熟品种(乐豆1号)次之,早熟品种(浙春3号)最低.与早中熟品种比较,晚熟品种表现为营养生长期较长,与玉米的生殖共生期为零,植株较高,茎粗增加0.13～0.16 cm,分枝多0.38～0.89个,主茎节数多4.47～7.12个,单株有效荚数、每荚粒数极显著高于早中熟品种,适合套作.播期间产量也有差异,以播期6月7日的产量最高.品种不同,表现略有差异.中晚熟品种的适宜播期为6月7日,表现为单株荚数、荚粒数较高;早熟品种以6月14日的产量较高,表现为单株荚数、荚粒数和百粒重较高.

EFFECT OF DIFFERENT VARIETIES AND SOWING DATES ON THE YIELD OF RELAY-CROPPING SOYBEAN IN THE MOUND DISTRICT

The effect of different varieties and sowing dates on the yield of relay-cropping soybean in the mound district were studied under wheat/corn/soybean relay-cropping system.The results showed as follows.The yield among three varieties was the most significantly different,the yield of late maturing variety(Gongxuan No.1) was the highest,and that of mid-maturing variety(Ledou No.1) took second place,that of early maturing variety(Zhechun No.3) was the lowest.Compared with early maturing variety and mid-maturing variety,the nutritive growth period of the late maturing variety was longer,and it's symbiotic period of reproductive growth with maize was 0 day,and it's plant height was higher,stem diameter was wider by 0.13~0.16 cm,it's branch number increased 0.38~0.89,the number of stem node increased 4.47~7.12.The pod number per plant and seed number per pod was much higher.Therefore,the late maturing variety was suitable to relay-cropping.The yield among sowing dates was also significantly different,the best sowing date was June 7.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 June 7,when their pod number per plant and seed number per pod were much higher than other sowing dates;the optimum sowing date of early maturing variety was June 14,when it's pod number per plant,seed number per pod and seed weight was higher than other sowing dates.