Studies on Sterility of Indica Rice:Part-2 Effect of nitrogen application and depletion at different stages of growth on sterility in indica rice

概要

論文の詳細を見る
This experiment was carried out by pot solution culture using two varieties, H-4 and Murungakayan-302, in 1959 as a part of "studies on sterility of indica rice". Plants were grown with different treatments, consisted of application or depletion of nitrogen at different stages of growth. The main results obtained from this experiment are as follows : 1. Murungakayan-302 gave remarkable decrease in yield accompanied with high sterility when nitrogen applied up to heading stage and the highest yield in this variety was obtained when nitrogen was applied up to five weeks prior to heading and depleted from this stage onward. 2. H-4 gave the highest yield when nitrogen was applied up to three weeks prior to heading and it can produce a fairly high yield even when nitrogen was applied up to heading stage. 3. Nitrogen applied during the reproductive growth period to the plant which has grown without nitrogen during the vegetative growth period caused serious sterility. 4. It was observed that the optimum concentration of nitrogen in culture solution for indica varieties was very much lower than for japonica varieties. The defference might be attributable to the difference in the activity of nitrogen assimilation in the plant. 5. Sensitivity of indica rice to nitrogen might be playing a role in the occurence of high sterility percentage.
日本熱帯農業学会の論文