河西走廊稻区土壤K素动态及K肥施用效果

Dynamics of soil potassium and effects of fotassium fertilizer application in the rice growing areas of Hexi Passage

摘要

摘要:通过6年的试验示范，对河西走廊中部的张掖市稻区土壤K素动态变化，进行了长期定位踊跃测试。结果表明，该区各类土壤速效钾含量均呈下降趋势，且下降程度因土壤类型、N、P、Zn肥及有机肥施用量等不同而异。同时，设多点对K肥施用量和效果进行了长期试验，从而找出了最佳施用量，为肥料结构的调整、合理施用K肥提供了科学依据。

Abstract:Six years' location investigations and tests on soil K dynamics in the rice growing areas of Zhangye City, which locates in the central part of Hexi passage,showed that soil Kcontents of different type of soil are all decreasing,the decreasing rate is in relation to soil type,amouns of N,P and Zn fertilizers applied.Based on long-period tests the optimum amount of K fertilizer application was got. This provided the base for rational application of potassium fertilier to rice.