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Characteristics of soil humic substances extracted with some organic and inorganic solvents and
purified by the HCl HF treatment

Soil
https://www.viagrasansordonnancefr.com/viagra-et-autres/ Science, 146 (6) 418 426 (1988). A.PICCOLO

Phosphorus status of some Ethiopian soils
Tropical Agriculture, 63(2) 137 142 (1986). A.PICCOLO, G.Huluka