Effects of Cutting Interval and Heading on the Dry Matter Production of Guineagrass (Panicum maximum Jacq. var. maximum cv. Natsukaze) and Green panic (P. maximum Jacq. var. trichoglume Eyles)

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  • ギニアグラス(Panicum maximum Jacq.)とグリーンパニック(P. maximum Jacq. var. trichoglume Eyles)の乾物収量に及ぼす刈取り間隔と出穂の影響
  • ギニアグラス Panicum maximum Jacq.ト グリーン パニック

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Abstract

The effects of cutting interval and heading on the dry matter production were investigated in guineagrass (cv. Natsukaze) (GN) and green panic (GG). The grasses were subjected to three levels of cutting frequencies; every 21 days, each time the canopy intercepted about 95% of solar radiation, and twice at the maximum heading stage. The annual dry matter yield increased with decrease in the cutting frequency in both species, and the response was greater in GN than in GG. The heading ratio (percentage of heading tiller number to total tiller number, HP) decreased as the cutting frequency increased in both species. In GG, the crop growth rate of top (CGRt) increased with increasing HP at the early heading stage. However the increase in CGRt was gradually depressed with the progress of the heading stage, and finally CGRt decreased with increasing HP at the maximum heading stage. On the other hand, CGRt in GN did not show a decreasing tendency with increasing HP. It was suggested that the difference in the annual dry matter production between the two grasses was caused by the different responses of CGRt to HP.

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