Changes in the chemical composition and dry matter yield of standing crop of regrowth herbage on pasture of university, farm, Tottori University [Japan]
1990
Yamamoto, T. (Tottori Univ. (Japan). Faculty of Agriculture) | Yamane, M. | Kobara, R. | Masumoto, T. | Oura, R. | Sekine, J.
To obtain fundamental consideration on the period for defoliation after harvesting the first cut grass, the chemical composition and the amounts of a standing crop of herbage were determined 3 to 4 times by using the quadrat method on the pasture of the experimental farm, Tottori University. Results obtained were as follows: 1) The content of organic matter in herbage stayed at about the same level with a slightly increasing tendency. 2) Contents of fiber fractions increased, whereas that of crude protein decreased in herbages dominant with Italian ryegrass as the period elapsed after harvesting the first cut hay. While the inclusion of clover in herbage caused a slower decreasing rate of the crude protein content. 3) The amounts of a standing crop increased exponentially as the period elapsed after defoliation. 4) Second cut hay showed a relatively higher nutrient digestibility determined by Japanese black steers. Digestibilities of dry matter and fibrous fractions were 71% and over 60%, respectively. 5) Considering the dry matter yield of a standing crop and the content of crude protein and digestibility, the second defoliation should be done at 40 days after harvesting the first cut hay for the ryegrass-dominant area and 46-50 days for the clover-dominant area. In addition, 4 times of defoliation with appropriate intervals per a year and proper fertilization are inferred to improve herbage production per unit of pasture
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