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    Chapter and Conference Paper

    On the Potential of K-Nutrition and the Requirement of K-Fertilizer in Important Paddy Soils of China

    The appearing of potassium deficient symbols on rice plant and the good response of rice crops to potassium fertilizer have been recently revealed in important types of the paddy soil in China(l).

    **e Jian-chang, Ma Mao-tong, Du Cheng-lin… in Proceedings of Symposium on Paddy Soils (1981)