Abstract
Effects of Soluble Salts on Insoluble Phosphates
Highlights
This study has been taken up from two viewpoints
The most phosphorus is extracted from the unweathered phosphate by the ammonium compounds, magnesium sulphate, and potassium nitrate
Disregarding the result obtained with the soil and phosphate mixed, we find that magnesium sulphate and ammonium chloride rendered the phosphate more soluble
Summary
This study has been taken up from two viewpoints. First, a study of field and pot experiments, with a view of determining, if possible, the indirect action of various salts when used as fertilizers; to ascertain if the increase in yield obtained from the use of a fertilizer is not due in part to the solvent action which it exerts on the comparatively insoluble phosphorus in the soil. That some fertilizers have an indirect effect has long been an acknowledged fact It is no longer believed, that the increase in yield obtained from the use of one ton of barnyard manure, is alone due to the addition of the two or three pounds of phosphorus and the ten or twelve pounds each of nitrogen and potassium which it contains; but no small part of the increase is due to the liberation of more plant food. This (I) is brought about by the decaying of organic matter with the formation of various acids which in turn act as solvents on insoluble plant food already in the soil.
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