【摘要】 通过70组田间试验研究了湖北省主产区小麦施钾的增产、增收效应及钾利用效率。结果表明,增施适量钾肥具有显著的增产增收效果,小麦平均增产556～978 kg/hm2,增产率为9.5%～16.7%;施钾平均增加经济收益192～897元/hm2,产投比为1.2～4.7;钾的偏生产力和农学效率分别为71.0 kg/kg和7.4 kg/kg。应用直线加平台模型拟合小麦产量与钾用量的关系,求得湖北省小麦钾的最佳用量平均约为87 kg/hm2。更多还原

【Abstract】 Seventy field trials of potassium(K) fertilizer application to wheat were conducted in Hubei province.The effect of K fertilization on yield,profit of wheat,and K use efficiency of wheat in Hubei province were studied.The results showed that K application promoted both the yield and profit of wheat significantly.The average yield increment with K fertilization was 556～978 kg/hm2 and the increasing rate was 9.5%～16.7%.Compared to the control(no K treatment),profit of K application increased 192～897 yuan/hm2 and the value cost ratio(VCR) averaged 1.2～4.7.The partial factor productivity of applied K(PFPK) and agronomic K use efficiency(AEK) averaged 71.0 and 7.4 kg/kg K2O,respectively.According to linear plus platform model,the average optimum K application rate was 87 kg K2O/hm2 for wheat in Hubei province.更多还原