套作模式下播期对不同熟性大豆茎叶形态及产量的影响

在麦/玉/豆套作模式下,研究了不同播期对不同熟性大豆茎叶形态及产量的影响。结果表明:3种熟性大豆在当地均有各自最适宜的播期。浙春3号的最适播期是7月6日,乐豆1号的最适播期是6月15日,而贡选1号的适宜播期是6月15日和6月22日,两者间产量差异不显著。晚熟大豆品种(贡选1号)较早熟品种(浙春3号)和中熟品种(乐豆1号)能显著缩短与玉米的生殖生长共生期,独立生长期最长,从而减轻了生育前期玉米对它的弱光伤害,保证了适宜的株高、较大的茎粗和茎干重以及理想的叶面积指数和比叶重。综合大豆的熟性和播期2个因素,麦/玉/豆套作模式下的最优组合为贡选1号在6月15日至6月22日之间播种。

Effects of Different Sowing Date and Maturing Cultivars on Stem and Leaf Morphological Characters and Yield of Soybean under Relay-cropping System

The effects of different sowing date and maturing cultivars on the stem and leaf morphological characters and yield of relay-cropping soybean under wheat/maize/soybean pattern were studied.The results showed that different maturing soybean had different best sowing dates in local area.The best sowing date of Zhechun No.3 was July 6;and Ledou NO.1 was June 15.The feasible sowing date of Gongxuan NO.1 was June 15 and June 22,the difference of yield under these two sowing date was insignificant.Comparing with early maturing variety(Zhechun No.3) and mid-maturing variety(Ledou NO.1),the single growth period of the late maturing vatiety(Gongxuan NO.1)was the longest,and it's symbiotic period of reproductive growth with maize was the shortest,which could reduce the shading stress of soybean during early growth stage.So it guaranteed that suitable plant height,bigger stem diameter and dry mater,ideal LAI and SLW.So,considering sowing date and maturing cultivars,the optimum combination of this experiment was Gongxuan NO.1 sowed during June 15 to June 22.