Citation

Nakashima, Y. and S. Kumagai, Studies on increase in feeding value of fibrous feeds. I. Effect of nitrogen top-dressing applied after the full heading time on the dry matter yield and chemical composition of rice straw. Journal of the Faculty of the Agriculture, Iwate University 11: 129-143, 1972.

Abstract

Experiments were carried out to investigate the effect of nitrogen top-dressing applied after the full heading time on the dry matter yields and chemical compositions of rice straw and unhulled rice.

1. Top-dressing with nitrogenous fertilizer applied after the full heading time increased the yields of fresh rice straw and unhulled rice as determined on the dry matter basis.

2. No obvious influence of the quantity of nitrogen top-dressing applied after the full heading time was found on the dry matter yields of fresh rice straw and unhulled rice. These dry matter yields, however, were affected remarkably by the data of application of nitrogen top-dressing after the full heading time. Namely, nitrogen top-dressing at the full heading time increased the dry matter yields of fresh rice straw and unhulled rice exceedingly. When applied after the full heading time, nitrogen top-dressing caused a rapid decrease in these dry matter yields with the lapse of time.

3. The dry matter yield of unhulled rice showed almost the same trend to change as the yield of fresh rice straw, decreasing due to retarded nitrogen top-dressing after the full heading time. The yield of unhulled rice, however, decreased more slowly that that of fresh rice straw.

4. Changes were observed in the crude protein content of fresh rice straw in relation to the quantity (1-4gN/M2 and the date of nitrogen top-dressing after the full heading time. It was shown that the lager he quantity of nitrogen applied and the nearer the time of application to full heading, the higher became the crude protein content. Namely, the crude protein content of fresh rice straw ranged from 5.55 to 7.45 per cent in D1, (top-dressing at the full heading time) and from 3.29 to 4.97 per cent in D2 (top-dressing 20 days after the full heading time)m while that of the control plot only with basal dressing was 4.29 per cent. As a result, nitrogen top-dressing at the full heading time increased the crude protein content of fresh rice straw by about 70 per cent.

5. The crude protein content of fresh rice straw showed a negative correlation with that of unhulled rice, as determined on the dry matter basis.

6. It was presumed that nitrogen top-dressing at the rate of 3.0 to 4.0g per square meter at the full heading time might be desirable in order to increase the crude protein content of fresh rice straw.

7. The crude protein content of fresh rice straw increased by the application of nitrogenous fertilizer after the full heading time in accordance with an increase in the non-protein nitrogen content of the straw.

Country, State, District, etc.

Japan

Language

Japanese (English abstract and title)

Material

rice straw

Use category

animal feed