The influence of fertilizers on the carotene and vitamin C content of plants

Abstract

Spinach was grown in pots and treated with different amts. of fertilizers. Under the conditions prevailing in the exps., the influence of P, Ca and Mg salts is small. A higher level of N results in a greater carotene and vitamin C content. An increasing K content of the soil causes a decrease in carotene content and an increase in vitamin C. An attempt is made to show a relationship between chlorophyll and carotene; on the other hand the suggestion that ascorbic acid only can be a product of photosynthesis is discussed. During storage under different circumstances spinach leaves show a rather rapid decrease in vitamin C. A modified method for estimating the carotene content of vegetables is given.