Effect of mineral nutrition on contents of organic constituents in sweet potato plants during growth

Abstract

Abstract Although chinese yam plants are an important crop in Japan, relatively little is known about their content of the organic constituents. IZAWA and NATAKE (1,2,3) showed some aspects of the effect of the fertilizer treatment on the organic composition of chinese yam plants at various phase of their vegetation. Many reports on chinese yam plants have appeared; nevertheless, the nature of carbohydrate and nitrogen metabolism has remained unknown. However, there are a number of excellent reports (4, 5, 6) which directly or indirectly have a bearing on these biochemical phase in sweet Potato plants. Therefore, the objectives of the Present study were twofold : a) to determine the contents of sugars, starch, alcohol-insoluble solids, and various nitrogen constituents in sweet potato plants during growth as affected by mineral nutrition, and b) to compare the effect of mineral nutrition on sweet potato plants with its effect on chinese yam plants.