Effect of Certain Deficiencies on Nitrogen Metabolism of Plants

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Abstract
Peking soy beans and Connec-ticut field pumpkins grown in sand were watered with salt solutions, essentially Knop''s solution diluted to 1/10 concentration, and in the solution just mentioned with the omission, in different cultures, of each of the elements, Mg, K, and Ca. Five days after emergence the cotyledons were removed and at 35 days the plants were harvested and divided into leaves and stems. The 3 parts were analyzed separately. No particular effect of Mg deficiency on the appearance of the plants or on chemical composition could be observed. K-deficiency affected the color of the leaves and apparently interfered somewhat with carbohydrate transport as well as with the proportion of the different N fractions. Ca deficiency had the greatest effect, resulting in stunted plants with very poor, discolored roots, with leaves containing an accumulation of nitrate, and with lower amounts of amino acid and insoluble N.

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