不同氮磷钾肥施用量对甘薯产量及养分利用率的影响

Effects of Different Fertilization of Nitrogen, Phosphorus and Potassium on the Yield and Nutrient Use Efficiency in Sweet Potato

采用田间小区试验,研究不同施肥处理对甘薯产量及养分吸收利用率的影响。结果表明,平衡施肥(N2P2K2)增产效果明显;甘薯氮磷钾素的偏因子生产力随养分施用量的提高而降低,且从高到低依次为磷素、氮素和钾素。甘薯氮磷钾素的农学效率随着养分施用量的提高呈先增大后减小的趋势;氮、磷素的养分回收利用率随着氮、磷肥施用量的提高呈先增后降的趋势,钾素养分回收利用率随着养分施用量的提高而降低。平衡施肥(N2P2K2)的氮磷钾素农学利用率与氮磷素的养分回收利用率显著高于其他处理,且差异显著。

A field plot experiment was conducted to study the effects of different fertilization treatments on the yield and nutrient use efficiency in sweet potato. The results showed that the effect was obvious and significant difference of increased production in the balanced fertilization（N2P2K2）. The partial factor productivity of NPK in sweet potato reduced as the increase of applying nutrient content,and removal from high to low in turn was phosphorus, nitrogen and potassium. The agronomic efficiency of NPK in sweet potato with the increase of applying nutrient content, the trend of first increases and then decreases. The nutrient recovery efficiency of NP with the fertilization first increased and then droped. The nutrient recovery efficiency of K reduced as the increase of applying nutrient content. The balanced fertilization（N2P2K2）could significantly improve the yield, agronomic use efficiency and nutrient recovery efficiency of NPK in sweet potato, and the difference was significant with other treatments.