EFFECT OF ORGANIC MATERIALS AND FERTILIZER TREATMENTS UPON THE SOLUBLE NUTRIENTS IN SOILS

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Abstract
Organic materials commonly returned to the soil contain water-soluble nutrients, the greater portion of which may be absorbed by the soil colloids, organic and inorganic, and held against future crop needs. Similarly, soluble fertilizers when added to soils are partially absorbed and held. Microorganisms no doubt play an important part in the absorption of both N and the inorganic nutrients. The liberation of nutrients depends largely on biol. processes and especially on the solvent effect of the strong acids such as nitric acid. The conc. of cation solutes tends, in general, to follow the abundance of nitrates in the soils studied. Carbonic acid does not appear to cause much solvent action, particularly in acid soils; in neutral or alkaline soils its effect is probably greater. The greatest quantity of water-soluble nutrients is found in the surface soil, where organic matter is most abundant and where biol. processes are most active.

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