施氮量对杂交油菜生物性状及产量的影响

The effects of nitrogen on biological character and yield of hybrid rape(Brassica napus L.)

为了获得油研9号和油研10号高产栽培的适宜施氮量，进行了不同施氮量对叶面积系数、群体干物重、植株性状和产量影响的试验。结果表明，不同施氮量处理间的产量、平均叶面积系数差异极显著，平均干物重差异显著。各生育时期的叶面积系数随施氮量增加而增大，整个生育进程叶面积系数发展动态呈抛物线型变化，现蕾至初花期迭最大值，平均为1．85—7．05；各生育时期的群体干物重随施氮量增加而增大，但成熟期施氮量最高（375kg·hm^-2）时干物重则降低；群体干物重随生育进程逐渐增加，成熟期达最大值，平均为8937．0—20313．5kg·hm^-2；施氮量对植株性状有明显的影响。油研9号和油研10号适宜施氮量（纯氮）为205—225kg·hm^-2，能获得3100kg·hm^-2以上高产。

In order to obtain suitable nitrogen amount applied for high yield of Youyan No. 9 and Youyan No. 10 ,study was done for different nitrogen amount applied on yield and average leaf area index, dry wright, plant character and yield. There is an extremely significant difference among different nitrogen amount applied on yield and average leaf area index, significant difference on average dry weight. With nitrogen amount applied increasing,leaf area index increases. There is a the parabolieal curves change in the progress of growth,the largest leaf area index can be obtained from shoot to bud, mean is 1.85 - 7.05. With nitrogen amount applied increasing in different treatment,dry weight increases, When nitrogen amount applied reached the highest in mature period,dry weight is the lowest,with the pragrass of growth increasing,dry weight reached maximum in mature period,the mean is 8 937.0 -20 313.5kg·hm^-2 ,there is a parabolieal curves eorrelatien between dry weight and nitrogen amount applied, Suitable amount of applied nitrogen is 205 -225kg·hm^-2, the yield can reach more than 3100kg·hm^-2.