【摘要】 通过大田试验研究磷肥用量对油菜产量、养分含量、养分累积量及磷肥利用效率的影响。结果表明,与不施磷相比,施磷肥(P2O5)37.5、75.0和112.5kg/hm2平均分别增产24.2%、42.9%和43.2%,籽粒含磷量增加10.5%、16.7%和27.1%,植株地上部磷素总累积量提高36.1%、59.1%和78.7%。施磷促进油菜生长,提高油菜对磷素的吸收和累积,显著增加100kg籽粒需磷量。但磷肥农学利用率、偏生产力、表观利用率和生理利用率均随磷肥用量的增加显著下降。磷肥用量为75.0kg/hm2时可达到油菜的高产高效生产。更多还原

【Abstract】 Field experiments were carried out to study the effects of phosphorus(P) application rate on rapeseed yield and P fertilizer use efficiency in Hubei Province during 2007-2008.Compared to the control with zero P application,the yield of P2O5 treatments(as 37.5,75.0 and 112.5kg/hm2,respectively) increased 24.2%,42.9% and 43.2%,as well as the P content increased 10.5%,16.7% and 27.1%,and total P absorbed by aboveground parts increased 36.1%,59.1% and 78.7%,respectively.The results indicated significant promotion of P application to growth,yield and P accumulation.With the increase of P application rate,the P required for 100kg seeds was increased,while the P agronomic use efficiency(AUE),partial factor productivity(PFP),apparent recovery efficiency(ARE) and physiological use efficiency(PUE) of rapeseed were decreased significantly.75.0kg/hm2 of P fertilizer was the optimum to both yield and P use efficiency.更多还原