摘要
本文测定了２０个低丘红壤的钾位值，研究了钾位与土壤钾素含量和玉米钾肥反应之间的关系，探讨了钾位用于玉米需钾诊断的可能性。结果表明：低丘红壤钾位变幅在２．５４～３．４６之间，平均为２．９６。钾位与土壤速效钾，酸溶性钾，玉米籽粒相对产量、总干物质相对产量和无钾处理玉米吸钾量之间达极显著相关，相关系数分别为－０．９５６８＊＊、－０．８７２３＊＊、－０．８１１３＊＊、－０．８４５４＊＊和－０．７６４７＊＊；钾位与土壤缓效钾之间达显著相关，相关系数为－０．５０９３＊＊。玉米钾位的临界指标为２．９５。钾位可以说明土壤供钾能力和诊断玉米需钾。
The present paper measured potassium potential, pK-1/2p (Ca+Mg), of twenty hilly red soils in Zhejiang Province, studied the relationships of potassium potential to soil K contents and K fertillzer effect of 20 corn field experiments, and further explored the possibility of diagnosing corn K requirement using potassium potential. Results showed that the potassium potential ranged from 2.54 to 3.46, with an average of 2.96. Potassium potential was significantly correlated with soil available K, HNO 3 soluble K, relative corn grain yield, relative total corn dry matter yield, and K uptake of corn in NP treatment, with the correlation coefficients of -0.9568 ** , -0.8723 ** , -0.8113 ** , -0.8454 ** , and -0.7647 ** , respectively; potassium potential was also significantly correlated, -0.5093 *, with the slowly available K. The critical value of potassium potential for corn is 2.95. Potassium potential could be used to indicate K supplying power of soil and to diagnose K requirement of corn.
出处
《浙江农业学报》
CSCD
1996年第2期82-85,共4页
Acta Agriculturae Zhejiangensis
基金
国家自然科学基金
浙江省自然科学基金
关键词
钾位
低丘红壤
玉米
诊断
Potassium potential
Hilly red soil
Corn
Diagnosis
