Humic substances in soil substances in soil subsctances in soil and crop sciences
Humic substances in soil substances in soil subsctances in soil and crop sciences Selected readings : edited by P. MacCarthy, et. al. - Madison American Society of Agronomy 1990 - 281 p.
Humus
Soil
Soils-Humic Acid
631.417.2(063) / S 989 P