This paper is one part of the study on the essence of soil fertility.It proves again that the characteristics of binding status and the content of various components of soil humic substances and the quantitative distribution of different fractions of microaggregates strongly influence the "physique" and the "pedon structure" of soil.The constituent characteristics and functioning mechanism of fundamental substances of fertility in red earth are related to a certain eztent to the higher content of free ferric oxides in soil and their different distribution in various fractions of microaggregates.
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周礼恺,严昶昇,武冠云,陈恩凤.土壤肥力实质的研究Ⅲ.红壤[J].土壤学报,1986,23(3):193-203. Zhou Likai, Yan Changsheng, Wu Guanyun, Chen Enfeng. STUDY ON THE ESSENCE OF SOIL FERTILITY Ⅲ. RED EARTH[J]. Acta Pedologica Sinica,1986,23(3):193-203.