河西灌漠土施钾效应的定位试验研究

Effects of potassic fertilizer on crop growth in bushy sierozem:a long-term experiment in Hexi district of Gansu

4年定位试验表明，小麦、玉米、甜菜单作条件下施K无明显效果。带状间作条件下小麦作物第3、4年出现施K显效效应，平均增产12.4%～14.9%；带田玉米当年出现施K效应，连续4年平均增产率为16%～27.9%。K肥对带田作物品质也有改善作用。

A long-term (for four years) experiment on the effects of potassic (K) fertilizer on crop growth in bushy sierozem in Hexi distict was conducted by the authors and the results showed that potassium application had no obvious effect on the yield of single-planted wheat, maize and beetroot. However, evident response arose on the yield of band-unterplanted wheat in the third or fourth year after potassium application and the yield increased 12.4% to 14.9% on average. The yield of band-interplanted maize showed remarkable response in the same year of potassium application and had increased 16% to 27.9% on average per year for four consecutive years. In addition, potassic fertilizer could improve the quality of band-interplanted crops.