Effect of nitrogen fertilization levels on the regrowth carbohydrate reserves and dry matter yield of sorghum sudan grass hybrid and other forage crops

Lee, J.K.; Seo, S.

Korean Journal of Animal Science 30(7): 441-445

1988


Accession: 007254622

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Abstract
This field experiment was carried out to determine the effects of nitrogen (N) fertilization on the dry matter yield, crude protein yield, carbohydrate reserves in stubble, dead stubble after cutting, tillering and branching of sorghum-sudangrass hybrid (Sorghum bicolor (L.) MoOench), pearl millet Pennisetum typhoides (Burm.) Staf and C.E. Hubb.) and teosinte (Euchiaena maxicana Schrab.). The main plot was three summer forage crops, and the subplot was three N levels (0, 200 and 400 kg/ha). The experiment was performed at College of Agriculture, SNU, Suweon in 1984. The results obtained are summarized as follows: 1. Dry matter yield ws significantly (P < 0.05) increased with increasing N level, regardless of forage crops. Among three species, the yield of sorghum-sudangrass hybrid. 2. The percentage of crude protein was increasing level of N. Pearl millet showed the highest percentage of crude protein at the second cutting, and the sorghum-sudangrass hybrid produced the highest total protein yield. 3. The content of carbohydrate reserves in stubble was decreased rapidly after the second cutting, and it was recovered to original state after two weeks. And the carbohydrate reserves was tended to be decreased with higher N level, but it was affected little by forage crops. 4. The number of dead stubble after cutting was significantly (P < 0.05) increased with increasing N level. Dead stubble after the second cutting was observed more than that of the first cutting. The number of tiller and branch after cutting were tended to be increased with increasing level of N. 5. In conclusion, this experiment suggested that the more yield of three forage crops could be obtained favorably with 200 kg N/ha, and the sorghum-sudangrass hybrid produced the highest yield during summer season.