Dry Matter Digestibility and Nitrogen Content of Tropical Forage Legume Aeschynomene americana L. Grown in the Drained Paddy Field and Upland Field

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  • 暖地型マメ科Aeschynomene americana L.の生育に伴う乾物消化率及び窒素含有率の推移
  • 暖地型豆科 Aeschynomene americana L. の生育に伴う乾物消化率及び窒素含有率の推移
  • ダンチガタ マメカ Aeschynomene americana L ノ セイイク ニ トモナウ カンブツ ショウカリツ オヨビ チッソ ガンユウリツ ノ スイイ

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In this field experiment, in vitro dry matter digestibility (IVDMD) and nitrogen content of tropical forage legume Aeschynomene americana L. grown in drained paddy field and upland field in 1994 and 1995 were examined. Three Aeschynomene americana strains (cv. Glenn, CPI 93556 and cv. Lee) and phasey bean (Macroptilium lathyroides (L.) Urb. cv. Murray) were sown in the drained paddy field and the upland field on June 1 every year. IVDMD and nitrogen content were measured at intervals of 15-20 days from July to November. IVDMD and nitrogen concentration in Aeschynomene and phasey bean reduced with plant growth, especially, from August to September of high air temperature period. In 1994, water stress was occurred in upland field grown plants, but large decreases in IVDMD and nitrogen concentration did not arise. Compared with upland field grown plants, drained paddy field grown plants had lower IVDMD, owing to rapid growth and higher dry matter yields. Significant partial correlation coefficients were recognized between IVDMD and dry matter yield or stem/leaf ratio, and between nitrogen concentration and dry matter yield or stem/leaf ratio in Aeschynomene. The main contribution factor to the rate of decrease in stem IVDMD of plant grown in the drained paddy field was days of vegetation in all Aeschynomene strains, and that in leaf IVDMD was air temperature in Glenn, days of vegetation in 93556 and solar radiation in Lee, respectively.

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