牧草の生育と消化率 : 2.グリーンパニックの出現時期別分げつ構成と乾物消化率

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  • Growth and Digestibility of Grasses : 2. Digestibility and tillering habit of green panic (Panicum maximum var. trichoglume cv. Petrie)
  • ボクソウ ノ セイイク ト ショウカリツ 2 グリーン パニック ノ シュツゲ

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The relationships with the tillering habit reported in the preceding paper and the change of digestibility with the advance of growth stage and the digestibility of the aftermath were examined. Dry matter digestibility was determined by in vitro method. Tillers appeared at late vegetative stage brought an effect to draw up the digestibility of the yield in the first growth, as the digestibility of the main shoot and tillers appeared at younger stage decreased rapidly with the advance of growth. As for the aftermath, the digestibility of the yield at T_2-2 was slightly higher than at T_4-2, and the digestibility of the yield composed of new tillers was higher than that produced by the regrowth of the tillers existing at defoliation. Significant correlation coefficients were obtained between days of growth of the tillers and their digestibility at respective sampling times, but as for the aftermath the coefficient at T_2-2 was not significant and the decline of digestibility with the growth were not big as in the first growth. The rate of decline of digestibility with days of growth was progressively rapid for the tillers appeared at the advanced stage in the first growth. The difference of the rate might come from the difference in growth performance of tillers according to the date of appearance reported in the preceding paper. There was not a significant correlation between the mean growth temperature of a tiller and its digestibility (r=-0.342). Comparing the digestibility of tillers of the same days of growth among the sampling times all the digestibility of the tillers declined rapidly from T_3 to T_4. Some other factors than environmental factors, such as "physiological senescence" of whole plant with heading should be considered. For the purpose of obtaining a higher yield with higher feeding value, it is necessary to harvest at about flag leaf expanding stage prior to heading, and it may be profitable to practice suitable fertilizations to ensure the appearance of larger number of tillers at late vegetative stage in the first growth and ensure the larger number and better growth of tillers which appear immediately after defoliation in the aftermath.

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