施肥水平和种植密度对冬油菜生长的影响

采用大田小区试验,在高/低施肥水平条件下研究了3种种植密度对杂交冬油菜新品种湘杂油763的产量的影响。结果表明:高施肥量条件下,密度增加对茎叶生长的抑制作用明显大于低施肥量条件,在所测定的3种茎叶形态指标中,对叶长和叶宽的抑制作用最大,其次是根茎粗,第三是绿叶数;而在低施肥量条件下,密度增加对茎叶生长没有明显的抑制作用。籽粒产量施肥量较低时随着密度的增加而增加;产量构成因素,无论施肥水平高低,单株有效角果数、每角果粒数均随着密度的增加而减少,而千粒重随密度的变化较小。

Impacts of Different Fertilizer Rates and Planting Densities on Growth of Winter Rape

A field plot experiment was conducted to study the impacts of three planting densities on the yield of Xiangzayou763 under two fertilizer rates(high and low fertilizer rates).The results showed that under high fertilizer rate,the inhibitory effects of increasing planting density on growth of stem and leaf were obviously stronger than that under low fertilizer rate,and the strongest inhibitory effect was on the length and width of leaf,the following was on the diameter of root and stem,the last one was on the number of green leaves;under low fertilizer rate,increase of planting density had no obvious inhibitory effect on the growth of stem and leaf.The yield of seeds increased with increasing planting density when fertilizer rate was low;no matter the fertilizer rate was high or low,the number of effective pod per plant and the number of seeds per pod all decreased with increasing planting density,but the 1000-seeds weight changed little.