直播白菜适宜种植密度及其增产机理的研究

Study on Suitable Density and Mechanism of Increasing Yield Direct Seeding of Chinese Cabbage

[目的]为了研究不同密度条件对直播白菜产量形成的影响。[方法]以苏州青1号、苏州青2号为试验材料,采用随机区组设计,设4个密度处理,分别为18.0万、19.5万、21.0万、24.0万株/hm2。[结果]密度为24.0万株/hm2的处理理论产量最高,为1 918.2kg/hm2;密度与产量呈二次曲线的关系,由方程可得最高产量的密度为28.0万株/hm2;群体总茎枝数、群体总角果数和群体总粒数较高,源库协调是直播白菜高产的重要原因。[结论]从提高直播白菜产量的角度出发,直播白菜种植密度仍可适当增加,但不宜超过28.0万株/hm2。

[ Objective ] To study effects of different density conditions on yield of direct seeding Chinese Cabbage. [ Method ] Taking Suzhouqing No. 1, Suzhouqing No. 2 as test material,using randomized block design, setting 4 treatments,include 18.0 × 10^4, 19.5 × 10^4 ,21.0 × 10^4 ,24.0 × 10^4 planta/hm^2. [ Result] The theoretical yield of treatment with 24.0 × 10^4plants/hm^2 is the highest（ 1 918.2 kg/hm^2 ） ; density and yield indi- cate quadric curve relationship,the density of highest yield is 28.0× 10^4 plants/hm^2 ; The total stem and branch number,total silique number, and total grains are higher, source sink relation is an important reason for the high yield of direct seeding of Chinese Cabbage. [ Conclusion ] From perspective of increasing yield of direct seedling of Chinese Cabbage, the planting density can be appropriately increased,but not more than 28.0 × 10^4plants/hm^2.