Effects of Spraying Urea on the Foliage with Respect to the Protein Eomponents of Forage Crops

[摘要] (1) On the old leaves of Jerusalem artichoke plant, of which growth had stopped, 1% urea solution was sprinkled at the rate of 100 c. c. per pot. After the treatment, observation of growth and chemical analysis of the plant materials were made twice a week. (2) The green colour of the leaves became deep, and the tuber growth increased by 17%. However, the height of the top and the dry weight of it showed almost no changes. (3) Increase in crude protein and true protein was proved in the leaves and stems as well as in the tubers, while the ratios of true protein to crude protein decreased more or less. (4) In the leaves, almost no change was observed in carbohydrate contents. In the stems, however, the content decreased rapidly after the sprinkling treatment with urea solution. Poly-saccharide decreased remarkably, while reducing sugars increased to a great extent. Almost no change was seen in total sugar. (5) The urea sprinkling with suitable quantities, when applied 1 or 2 weeks before harvest improved rapidly the quality of leaves and simultaneously helped the tuber growth, thus serving double prupose.

[学科分类] 农业科学（综合）