底肥量追肥期对夏大豆产量性状的影响

EFFECTS OF AMOUNT OF BASE FERTILIZER AND STAGE OF TOP DRESSING ON YIELD CHARACTERS IN SUMMER SOYBEAN

用盆栽方法研究了底肥量、追肥期对夏大豆主要产量性状的影响。结果表明：底肥量、追肥期对夏大豆株荚数、株粒数、百粒重、株粒重都有极显著影响。底施２０克·株￣（－１）复合肥比不施底肥株产量增加３２％，结荚末期追尿素３克·株￣（－１）比不追肥株产量增加４３．２％。追肥期对株产量影响大小的顺序为：结荚末期＞鼓粒中期＞始花期＞分枝期＞不追肥。追肥过早，株荚数、株粒数都减少。底施２０克·株￣（－１）复合肥，于结荚末期追施氮肥，株产量最高。

The effecrs of amount of base fertilizer and stage of top dressing on yield characters ofsummer soybean were studied by pot culture. The results indicated that the effects of amount of base fertilizer and stage of top dressing on pods per plant,seeds per plant,weight of 100 seeds and seed weight per plant were extremely significant. The yield of treatment of applying 20g/plant complex fertilizer as base fertilizer was 32% higher than that of treatment without application of base fertilizer,and the yield of top dressing treatment applying urea 3g/plant at late pod formation stage was 43. 2% highter than that of treatment without top dressing. The effect of different stases of top dressing on yield per plant were as follows:late pod formation stage>middle seed fillins stage> initial flowering stase>branching stage>witout top dressing. If aplication of top dressing was too early,pods per plant and seeds per plant were reduced. In the treatment of applying 20g/plant complex. fertilizer as base fertilizer and additional N fertilizer as top dressing at late pod formation stage,the yield per plant was hasher than that of any other treatments.