密度与施肥对赣油杂5号产量及产量结构的影响

为确定新育杂交油菜品种赣油杂5号直播生产的适宜密、肥参数,在大田小区试验条件下,进行了密度(22.5万、37.5万、52.5万株/hm2)与施肥水平(N0、N8、N12、N16)对赣油杂5号产量及产量结构影响的研究。结果表明:施肥处理与不施肥对照产量差异达极显著水平;在中低密度条件下,施肥水平N12与N16的产量差异不显著,与N8差异显著;在高密条件下,高施肥水平没有增产作用,反而减产。不同密度间的总体产量差异不显著,但以22.5万～37.5万株/hm2为宜,过高的密度对增产不利。江西适播期内,赣油杂5号的适宜密度为22.5万～37.5万株/hm2,适宜施肥量为氮180、磷(P2O5)90、钾(K2O)90和硼砂16.5 kg/hm2。

Effects of Planting Density and Fertilization on Yield and Yield Components of Ganyouza No.5

In order to optimize the planting density and fertilizer application rate of hybrid rapeseed new variety Ganyouza No.5,which was directly sown,the effects of different planting densities(225000,375000,525000 plants/hm2) and fertilizer application rates(N0,N8,N12,N16) on the yield and yield components were studied through the field plot experiments.The results showed that there was very significant difference in the yield between the fertilization treatments and the control(without fertilization).Under the condition of low and middle planting densities,the yield in treatment N12 was not significantly different from that in treatment N16,but the yield difference between the treatment N12 and N8 was significant.Under the condition of high planting density,high levels of fertilization did not produce high yield,and it even reduced the yield.The yield of rapeseed among different planting density treatments was not obviously different.Therefore,when Ganyouza No.5 was sown during the proper date in Jiangxi,its appropriate application rates of N,P2O5,K2O and borax were 180,90,90 and 16.5 kg/hm2 respectively,and its suitable planting density was 225000~375000 plants per hectare,the higher density was disadvantage to yield increase.