Growth Tendency,Dry Matter Accumulation and Distribution of Summer Sowing Vegetable Soybean

Developing characteristics and population structures of vegetable soybean in summer sowing were studied by using four soybean varieties(lines).Also the rules of dry matter accumulation and distribution and fresh pod yield were studied.The result showed that plant height and leaf area index(LAI)increased quickly in earlier stages,but decreased slowly after mid-August.The growing course between emergence to fresh pod harvest was different among varieties,and Hefeng lines had the shortest growth period of about 64 days,Liao 99011 had the longest growth period of 79 days.Leaf area index of Liao 00128 was higher than others in any period.The population dry matter accumulation sharply increased after August 25 and peaked on September 22.Liao-00128 had higher dry matter accumulation,and distributed more dry matter to fresh pod in later stages and got the highest fresh pod yield of 8143.9 kg·ha-1.Therefore Liao 00128 is suitable for summer growing in Shenyang area.