As resulted from long-time cultivation and fertilization,a high fertile soil has been developed from loessial materials on high terrace of Wei-ho basin,Shensi.The soil possesses a dark,friable and porous upper horizon up to 50 cm.in thickness.
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彭祥林,李玉山,朱显谟.关中红油土地区的轮作制[J].土壤学报,1961,9(Z1):42-55. C. L. PENC, Y. S. LEE, H. M. CHU. ROTATION SYSTEM OF FERTILE CINNAMON SOIL DEVELOPED ON HIGH LOESSIAL TERRACE OF WEI-HO BASIN, SHENSI[J]. Acta Pedologica Sinica,1961,9(Z1):42-55.