THE RELATION BETWEEN THE CONCENTRATION OF MINERAL ELEMENTS IN A CULTURE MEDIUM AND THE ABSORPTION AND UTILIZATION OF THOSE ELEMENTS BY PLANTS

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Abstract
Maize was grown in large volumes of culture solution, the phosphate content of which ranged from 0.05 p.p.m. to 0.50 p.p.m. PO4. The results indicate that it makes maximum growth at 0.10 p.p.m. PO4 if that concentration can be maintained throughout the growing period. Maize and soybeans were grown in culture solutions which varied in K concentration from 0.5 p.p.m. to 25 p.p.m. K. Growth was at a maximum at a concentration of 2.0 p.p.m. K or possibly less. The bearing of these data on the question of the nutrition of plants growing in soils is discussed. The results are taken to indicate that in many soils the displaced soil solution is adequate for the K nutrition of plants, but that root-soil contact is necessary for phosphate nutrition.

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