低丘红壤春大豆种植密度的研究

本文分析了在低丘红壤的生态条件下,春大豆不同种植密度与产量的关系;植株性状的变化特点;以及不同种植方式对产量的影响。试验结果表明,春大豆群体是一个高度自我调节的系统,其适宜种植密度范围较大。每亩穴数相同每穴株数不同种植方式的密度差别为21.26～43.25千株/亩,当种植密度为30.968千株/亩时,期望最高产量为174.3kg/亩,单株最高产量为15.2961g。每亩穴数不同每穴株数相同种植方式的密度差别为24.01～53.18千株/亩,当种植密度为36.678千株/亩时,期望最高产量为146.7kg亩,单株最高产量为10.8713g。在相同的种植密度条件下,种植方式前者优于后者,增产幅度分别达5.56～34.26％。综合试验结果,在本试验条件下,浙春2号每亩种植7.500～12.000穴,每穴留苗4株左右,这样的群体结构较为合理。

STUDY ON SPRING SOYBEAN PLANT DENSITY IN LOW-HILLY RED SOIL

Relationships between plant density, plant pattern and yield, variation characteristic of plant character in ecologcal condition of low - hilly red soil were analyzed. The results showed that spring soybean population was a highly self regulating system. Its suitable plant density scpoe was great. The plant pattern with same hole per mu and different plant per hole was 21. 26-43. 25 thousand plants/mu. Its expected highest yield was 174. 3kg/mu, 15. 2961g/plant with the plant density of 30. 968 thousand plants/mu. The plant: pattern with different hole per mu and same plant per hole was 24. 01-53. 18 thousand plants/mu. Its expected highest yield was 146. 7kg/ mu, 10. 8713g/plant with the plant density of 36. 678 thousand plants/mu. The former plant pattern was better than the latter when they have same plant density, the increase range of yield was 5. 56-34. 26%. The result indicated that the density of 7,500-12,000 holes/mu and 4 plants/hole are suitable population structure of Zhechun 2 under the experimental condition.