According to 507 determinations of volumeweight, specific gravity and total porosity of five main soil types in Heilungkiang province, it was found that there is a high correlation between volume weight and total porosity, and the later can be calculated directly from volume weight with an empirical equation.
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趙洪书.从容重计算土壤总孔隙度的初步探讨[J].土壤学报,1964,12(2):230-234. H. S. CHAO. A METHOD FOR THE CALCULATION OF SOIL POROSITY FROM VOLUME WEIGHT[J]. Acta Pedologica Sinica,1964,12(2):230-234.