不同种植密度和施肥量对湘杂油763产量及养分吸收的影响

Effect of Planting Density and Fertilizer Application Amount on the Yield and Nutrient Uptate of Xiang Hybrid No.763

采用大田小区试验,研究了优质杂交冬油菜新品种湘杂油763在6种不同密度和5种不同施肥水平下,籽粒产量和N、P2O5、K2O、S、B吸收量的变化。结果表明,无论密度高低籽粒产量均随着施肥量的增加而增加,但是高密度条件下的增加幅度小于低密度条件;施肥量较低时籽粒产量随着密度的增加而增加,高施肥量高密度条件下反而下降。所有处理中以中密度(22.5万/hm2)和高施肥量(N、P2O5、K2O、B施用量为240、120、210、1.2 kg/hm2)处理的籽粒产量最高。养分吸收量,相同密度条件下随施肥量的变化趋势与产量相同,均随着施肥量的增加而增加;相同施肥量条件下随密度的变化趋势则与产量不同,高施肥量条件下N、P、K吸收量以密度为22.5万/hm2的最高,其余施肥量条件下,N、P吸收量随着密度的增加而增加,而K的吸收量随密度的变化较小。S、B的吸收量均没有随密度的变化而发生有规律的变化。

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.