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Efectos de algas marinas sobre la disponibilidad de fósforo en suelos derivados de cenizas volcánicas.
(Chile, Instituto de Investigaciones Agropecuarias, 1976)
Effect of seaweed on phosphorus available of a soil derived from volcanic ash.
(American Society of Agronomy, 1971)
A modified resin exchange method for measurement of available phosphate in soils derived from volcanic ash
(The Williams & Wilkins Co., 1975)
Determination of maximum complexing ability of water-soluble complexants
(The Williams & Wilkins Co., 1972)