This paper deals with the forms and content of N, P, K, Ca, Mg, available SiO2 and micronutrients in soils of tropical region in South China according to which fertility of the soils are evaluated. The hyrolyzable N extracted by 6 N HCl in soils under the tropical rain forest and high grass was about 60-80% of the total N, and it was only 30% of the total N in lateritic upland field. It may be because the frequent ploughing on lateritic upland field accelerates the rapid decomposition of nitrogenous compounds in soil. Results of the study are summarized as follows.
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何电源.华南热带土壤养分含量状态及肥力评价[J].土壤学报,1983,20(2):154-166. He Dianyuan. FORMS AND CONTENT OF NUTRIENTS IN SOIL OF TROPICAL REGION IN SOUTH CHINA AND THE EVALUATION OF THEIR FERTILITY[J]. Acta Pedologica Sinica,1983,20(2):154-166.