牧草の生育と消化率 : 1.グリーンパニックにおける分げつの出現と分げつ構成

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  • Growth and Digestibility of Grasses : 1. Pattern of tiller appearance and their relative weight as yield components in green panic (Panicum maximum var. trichoglume cv. Petrie)
  • ボクソウ ノ セイイク ト ショウカリツ 1 グリーン パニック ニ オケル

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A field experiment was conducted to study the change of the digestibility of green panic with the advance of growth and the digestibility of the aftermath, in relation to the pattern of tiller appearance. Plants were sown on May 12, 1976, and cut at 5cm from ground level at 6 stages of growth ; vegetative stage (T_1), culm elongation stage (T_2), flag leaf expanding stage (T_3) and heading stage (T_4) of the main shoot in the first growth, and 21 days regrowths after the defoliations at T_2 (T_2-2) and T_4 (T_4-2). Tillers consisting yield portion were assorted according to the appearance interval of three days. Two active-tillering stages were observed in the first growth, one was at late vegetative stage and the other was after culm elongation. In the aftermath, many tillers appeared immediately after defoliation, decreased subsequently and again increased. As the yield components in the first growth, the proportional weight of tillers appeared at vegetative stage was high and had the ratio of more than 60% even at heading stage. About a half of the yield of the aftermath was occupied by the regrowth of the tillers existing at defoliation at T_2-2 and T_4-2. Tillers appeared immediately after defoliation occupied a considerably high portion of the yield produced by new tiller formation. Tiller size and stem weight ratio in its early growth stage were progressively larger in accordance to its appearance date with advancing stage of the main shoot. This fact suggests that the nutritive value of a tiller may differ with the date of appearance. In conclusion, the auther considers that the differences in the date of appearance of the tillers consisting a plant and in their relative weight as components of the yield portion among the stages of growth, will give an explanation of the differences of digestibility.

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