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.