施钾对紫色土稻麦产量及土壤钾素状况的影响  

EFFECTS OF LONG-TERM POTASSIUM APPLICATION ON YIELD AND SOIL POTASSIUM IN RICE-WHEAT CROPPING SYSTEM IN PURPLE SOIL

作　　者：熊明彪[1] 舒芬 宋光煜[1] 石孝均[1] 毛知耘[1] 

机构地区：[1]西南农业大学资源环境学院,重庆400716 [2]重庆市合川农业技术服务站,重庆401538

出　　处：《土壤学报》2003年第2期274-279,共6页Acta Pedologica Sinica

摘　　要：通过 9年定位试验 ,研究了水稻—小麦轮作中 ,连续施用钾肥对紫色土钾素形态、含量变化及钾肥产量效应的影响。结果表明 ,长期施钾明显提高稻麦产量 ,维持紫色土有效钾库的平衡 ,提高并保持土壤的持续供钾能力 ;在每年 75 0 0kghm- 2 稻秆还田的基础上 ,每季配施 70kghm- 2 (K2 O)左右的化学钾肥是维持紫色土土壤钾库平衡的有效措施。Summary Effects of long term K application on crop yield and soil K content and forms in rice wheat rotation were studied. The results showed that long term K application markedly increased crop yield, the balance of the available K in purple soil was maintained and the ability of soil to supply K was raised. A joint application of rice straw (7 500 kg hm -2 a -1 ) and chemical K fertilizer (about K 2O 140 kg hm -2 a -1 ) is recommended to keep the balance of K in purple soil.

关 键 词：紫色土 稻 麦 产量 土壤钾素 定位试验 含量 

分 类 号：S511[农业科学—作物学] S512.1