Based on the results of long-term (10 years) field experiments of potassium (K) application under three cropping systems including rape seed-early rice-later rice, middle rice-wheat, cotton-wheat in Hubei Province, the effect of long-term K application on the yields and profits of the crops is indicated in this paper. The influence of long-term K application on K contents and status in soil is also discussed.
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Chen Fang, Lu Jian-wei, Wan Yun-fan, Liu Dong-bi, Xu You-sheng. EFFECT OF LONG TERM POTASSIUM APPLICATION ON SOIL POTASSIUM CONTENT AND FORMS[J]. Acta Pedologica Sinica,2000,37(2):233-241.