Effects of Directly Sowing Density on Morphological Property,Yield and Its Components of Vegetables

[Objective] The aim was to explore the corresponding close planting techniques of directly sowing vegetables. [Method] Taking Suzhouqing No. 2 as tested variety,and using The Dutch AL-640-SNT Type Vegetable Precision Suction Seeder,4 kinds of plants space were designed under 12 kinds of combinations of land preparation method and sowing depth to study the effects of directly sowing density on morphological property,yield and its components of vegetables. [Result] Under the same land preparation method and sowing depth,with the increase of sowing density,stem diameter,plant height,branch number per plant,effective pod number per plant,1 000-grain weight,grain number per pod and weight per plant showed the decrease tendency,while group branch number and group pod number showed the rising tendency; with the increase of sowing depth,plant height,effective pod number per plant,group pod number showed the decrease tendency,while 1 000-grain weight showed rising tendency,the other indices had no significant corelation with the land preparation method and sowing depth. The combination of rotary tillage twice,covering soil 1 level,and plant spacing 7. 2 cm had the highest yield,and its yield components were more reasonable: basic seedling number was 24. 0 × 104plants per ha,effective pod number was 293. 5,group pod number was 7017. 0 × 104 per ha,grain number per pod was 10. 01,1 000-grain weight was 2. 18 g. [Conclusion]The study provides a technical reference for promoting directly sowing vegetables mechanized cultivation of Shanghai Farm in a large scale.