密度和施肥水平对双低油菜苏油1号产量及分枝习性的影响

Effect of density and nitrogen on the yield and branch characteristics of double low rapeseed ( Brassica napus L.) Suyou No.1

密度和施肥水平两因子对苏油 1号产量及分枝习性影响的研究结果表明 :( 1)移栽 11.2 5万株 /hm2 、施纯氮 2 70kg/hm2 是适宜苏油 1号的种植密度和施肥处理 ,产量达到 34 5 2 .0kg/hm2 。 ( 2 )产量结构因子以单位面积有效角果数对产量的影响较大 ,其次为千粒重和每角粒数。 ( 3)随密度和施氮量增加 ,单位面积有效角果数呈先增后减的趋势。千粒重与施氮量关系密切 ,但过量施氮则降低千粒重。 ( 4)单位面积分枝数多、分枝角果数多和分枝籽粒多是苏油

This experiment was conducted to investigate the effect of plantation density and nitrogen application on the yield and branch characteristics of double-low rapeseed Suyou No.1. The results showed as follows: (1) The highest yield in this experiment appeared in the treatment with density of 11.25×10 4 plants per hectare and nitrogen of 270kg per hectare. (2) Yield components showed that number of effective pods per hectare was more important than 1000 seeds weight and number of seed per pod. (3) The number of effective pods increased firstly and then decreased as density and nitrogen increased. There were close relationship between 1000 seed weight with amount of nitrogen applied, the 1000 seed weight was decreased when nitrogen applied over 225kg/hm 2. (4) High yielding population of Suyou No.1 had more branches, more pods per branch and more seeds produced by each branch.