Journal of The Korean Society of Grassland and Forage Science (한국초지조사료학회지)

The Korean Society of Grassland and Forage Science (한국초지조사료학회)
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Effect of Cutting Height on C and N Reserves and Consequent Regrowth in Frequently Defoliated Turf-Type Perennial Ryegrass(Lolium perenne L.)

잔디형 페레니얼 라이그라스에서 잦은 예취조건하의 예취높이가 저장 탄수화물과 단백질 함량 및 재생에 미치는 영향

  • 김대현 (전남대학교 농과대학 동물자원학과) ;
  • 정우진 (전남대학교 농과대학 동물자원학과) ;
  • 이복례 (전남대학교 농과대학 동물자원학과) ;
  • 김길용 (전남대학교 농과대학 농화학과) ;
  • 김태환 (전남대학교 농과대학 동물자원학과)
  • Published : 2001.06.01
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Abstract

Carbohydrate and soluble protein reserves and regrowth characteristics in response to cutting height were investigated over four regrowth cycles of turf-type perennial ryegrass(Lolium perenne L. cv. preludeII). When the plants were at the full-vegetative stage (twelve weeks-old), three sequential defoliations at 3, 6 and 9 cm above the root base were imposed at 2-week intervals. Shoot dry weight in all three treatments continuously decreased with progressing regrowth cycle and the decreasing rate was higher as cutting height was lowered. TNC (total non-structural carbohydrate) in stubble at the end of the fourth regrowth cycle in 3, 6 and 9 cm cutting height decreased by 98%, 82% and 27%, respectively, comparing the initial content. TNC in roots also largely decreased with similar pattern in response to cutting height, whereas the absolute amount was much less compared to stubble. Soluble protein in stubble in 3, 6 and 9 cm cutting height decreased by 98%, 82% and 57%, respectively, at the end of fourth regrowth. A significant correlations between TNC (r=0.906) or protein (r=0.879) at the fourth defoliation and dry weight of regrowing shoots at the end of fourth regrowth were observed. these results indicated that cutting height closely influences the levels of organic reserves available for new growth, and that the levels of reserves might provide a useful tool as a determinant for regrowth dynamics.

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