播期对不同大豆品种生育阶段与光合产物积累的影响

Effect of Sowing Date on Accumulation of Assimilate and Growth Period of Soybean Cultivars

以黑龙江省第一积温带的几个主栽品种为试村,研究了播期对其生育阶段与光合产物积累的影响。结果表明:适时晚播缩短了大豆的营养生长阶段,而对生殖生长阶段的影响较小。晚播与正常播期相比较,叶面积指数相近,光合速率降低,呼吸消耗强度大,干物质积累减少。晚播将使大豆的产量水平降低,降低程度因品种生育期差异而不同。

Studies on the effect of sowing date on growing stage and accumulation of assimilate were carried out by using major cultivars in No. 1 accumulation temperature zone of Heilongjiang. province. The results showed that; feasible late sowing reduced nutritive growth period and there was little effect on reproductive growth period. We compared the effect of late planting and normal sowing the results were as follow; there was a similar LAI. Photosynthetic rate was decreased, respiration rate was increased. Amount of dry matter accumulation went down. Yield decreased and the droped yield was related to the length of growth period of soybean.