移栽密度与施氮量对油菜生长发育和产量的影响

以华杂油9号为材料,研究了不同移栽密度与施氮量对油菜生长发育、植株生物学特性、产量构成因素和产量的影响。研究结果表明:在15～45万株/hm2的移栽密度下,移栽密度对油菜生育期无明显影响,前期施用氮肥能促进油菜苗期的生长发育。在相同的施氮条件,各处理油菜植株的单株叶干重、茎干重、叶面积均随着种植密度的增加而降低。各处理油菜产量均显著高于对照,其产量大小顺序为T4>T5>T6>T3>T1>T2,分别比对照增加175.90%、168.83%、180.97%、222.55%、220.54%和203.29%。试验条件下油菜获得高产的适宜施氮量为180.0 kg/hm2、移栽密度15万株/hm2。

Effects of Different Transplanting Densities and Nitrogen Fertilizer Rates on Growth and Yield of Rape

The effects of different transplanting densities and nitrogen fertilizer rates on growth,biological characteristics,yield components and yield of Huazayou 9 were studied.The results showed that with the transplanting density of 15～45×104 shoots/hm2,the growth period of rape was not affected by transplanting density,and application of nitrogen fertilizer in early period can promote the growth of rape in seedling stage;with the same nitrogen fertilizer rate,dry weight of leaf,dry weight of stem and leaf area per rape plant in each treatment all decreased with increasing transplanting density;the yield of rape in each treatment was all obviously higher than that in control,and the yield in each treatment ordered as T4>T5>T6>T3>T1>T2,which respectively increased by 175.90%,168.83%,180.97%,222.55%,220.54% and 203.29% than control;when nitrogen fertilizer rate was 180.0 kg/hm2 and transplanting density was 15×104 shoots/hm2,the rape can achieve high yield.