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本文以禾谷类作物(水稻)为对象进行盆栽和田间试验,用化学方法和电超滤法研究土壤供钾状况与水稻吸钾间的关系。作者初步试验结果已证明,非交换性钾(即缓效性钾)是水稻钾素的主要给源,根据禾谷类作物(稻、麦)的吸钾特点,我们提出用冷的2N HNO_2溶液提取法有可能作为测定水稻土有效钾的快速而简便的方法。本研究证明水稻土有效钾量小于10—12mgk/100克土为缺钾土壤。
In this paper, potted plants and field experiments were conducted on cereal crops (rice). The relationship between K supply and K uptake in soil was studied by chemical methods and electrofiltration. The preliminary results of the authors have proved that non-exchangeable potassium (ie, slow-acting potassium) is the main source of potassium for rice. Based on the characteristics of potassium uptake by cereal crops (rice and wheat), we propose a cold 2N HNO 2 solution The method may be used as a quick and easy method to determine the available potassium in paddy soil. This study shows that available potassium in paddy soil is less than 10-12mgk / 100 grams of soil potassium-deficient soil.