丰水年施钾量对不同肥力土壤玉米产量的影响

Effect of Potassium Fertilizer on Corn Yield in Soils with Different Fertility in a Higher Rainfall Year

在不同土壤肥力(风沙土和黑土)条件下,通过田间试验研究不同施钾量对玉米产量、钾肥利用率的影响。结果表明:在丰水年,风沙土(低钾)的玉米产量高于黑土(中高钾);风沙土的玉米植株吸钾量明显高于黑土;施钾可导致收获后黑土速效钾含量明显升高,而对风沙土速效钾含量无明显影响;低中高肥力土壤的最佳施钾量分别为98.2 kg/hm2、39.5 kg/hm2和49.5 kg/hm2。

Field trial for studying the effect of different potassium levels on corn yield of different potas- sium fertility soils was carried out. The results showed that in higher rainfall year the yield and K use effi- ciency on Aeolian sand of low potassium fertility was higher than that on Black soil of middle and high potas- sium fertility. Application of potassium fertilizer significantly enhanced available K in Black soil after har- vest, but available K in Aeolian sand soils did not change. The optimum potassium fertilization in low, middle and high fertility soils was 98.2 kg/hm2, 39.5 kg/hm2 and 49.5 kg/hm2, respectively.