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Plant Food Elements State Chemist's Letter No 4
In this detailed treatise the State Chemist explains how plants obtain nitrogen, why air nitrogen cannot be used directly, and how soil nutrients become available. It covers nitrate and citrate forms, the role of humus, mineral elements like phosphorus and potash, and the importance of soil analysis and crop rotation for sustained fertility.
MENTIONED IN THIS ARTICLE
SeRy
Department of Agriculture
Atlanta
T. KR. Sawtell
Brooks County
Union
Georgia