| Abstract:Small plot experiment was carried out in the fields to study the changes in grain yields and uptake amounts of nutrients N, P2O5, K2O, S, B of new hybrid winter rapeseed variety Xiang hybrid No.763, under conditions of six planting densities and five fertilizer rates.The results of measured grain yield showed that whether density was high or low, grain yield under same planting density increased with applying fertilizer rate, but the intensity of yield increase under high planting density was smaller than that under low planting density; under same applying fertilizer rate, yield of lower applying fertilizer rate increased with planting density, but yield of high applying rate decreased, grain yield under high density and applying rate also decreased.The grain yield reached the highest 2 300.94 kg/hm2 at treatment of medium density (225 000 plant/hm2) and high applying rate (amounts of N,P2O5, K2O,S,B were 240 kg/hm2,120 kg/hm2,210 kg/hm2,15 kg/hm2 and 12 kg/hm2, respectively).Measure ment of nutrients uptake indicated that under same planting density, nutrient uptake increased with applying rate, changes of nutrient uptake was similar to yields; but under same applying fertilizer rate, the change of nutrient uptake was not similar to yield.Under high applying fertilizer, uptake amounts of N,P2O5, K2O were highest at planting density 225 000 plant/hm2, under others applying rate, uptake amounts of N, P2O5 increased with density, while change of K2O uptake was smaller.The uptakes of S, B were not changed regularly with planting density. |
