摘要
本文用盆栽耗竭试验为参比，研究了7种化学浸据测钾方法对旱地土壤的适用性。试验结果表明：1．作物吸收的有效钾中非交换性钾占有很大比重，表明它是作物钾素的主要给源。2.供试7种化学浸提方法的测定结果与盆栽试验中的四项参比标准的统计结果表明，2mol／L冷HNO3法和阳离子树脂袋法与参比标准的相关性最好，均达极显著水平。3.2mol／L冷HNO3法和阳离子树脂袋法所提取的非交换性钾与作物吸收非交换性钾总量也都是极最著相关，表明两法提取的非交换性钾均属能被作物吸收的易有效的非交换性钾。4.本文推荐2mol／L冷HNO3法和阳离子树脂袋作为旱地土壤有效钾的测定方法，但2mol／L冷HNO3法在操作上更为简便。
The suitability of seven methods for chemical extrachon of available potassium in the upland fleld was studied by using exhaushon pot experiment as the reference standard. The results were sununarized as follows; 1. Available K absorbed by plants mainly Came from the nonexchangeable K, which was the main souree of K takd upby plants. 2. Der terminahon results of correlahon coefficients between four reference standards of pot exPeriment and results of seven chemical methods showde that correlahon between cold 2 mol / L HNO3 method and Cahon-exchange resion bagmethod was highly significant (0.953 and 0.903 average). 3. The correlahon betweenthe nonexchangeable K extracted by cold 2 mol / L HNO3 method and Cahon-exchange resin bag method and the amount of nonexchangeable K absorbed by plant was highly singificant. 4. Both of the cold 2 mol / L HNO3 method and Cationexchange resin bag method could be recommended as the methods for the detendnahon of available potassium in upland fleld, but the Cold 2 mol / L HNO3 method was more simpleand convenient than the Cation-exchange resin bag method.
出处
《土壤学报》
CAS
CSCD
北大核心
1997年第3期336-343,共8页
Acta Pedologica Sinica
关键词
供钾能力
有效钾
旱地土壤
测定
Exhaustion experiment, K-Supplying power, Available K,Determinahon method
