DIFFERENCES IN GROWTH LIMITATION OF CERTAIN PLANTS BY MAGNESIUM AND MINOR ELEMENT DEFICIENCIES

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Abstract
The growth response of a number of plants to Mg and "minor" element fertilization on 16 Alabama soils was compared. The plants were grown in pots in the greenhouse. To the basic fertilizer, NaNO3, KH2P04 and CaSO4 (especially purified salts were used), Mg, Mg +"minor" elements, and "minor" elements alone were added. Cultures without these additions were included. Corn (in the vegetative stage) was least affected by low Mg and minor element content of the soils. The greatest depression in yield due to Mg deficiency and little due to the lack of minor elements was observed with crotalaria. Turnips showed marked effect of minor element and little effect of Mg deficiencies. Crimson clover showed somewhat less the effect of minor element deficiency and more the effect of Mg deficiency than did turnips. Cotton was about equally affected by Mg and minor element deficiencies. Peanuts showed little effect of minor element deficiency but the yield of nuts was markedly decreased when Mg was deficient.

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