The Effect of Sward Height at the End of Each Grazing Period on Vegetation Change and Pasture Production under Rotational Grazing in Japanese Lawngrass (Zoysia japonica Steud.) Pastures

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  • Kaneko Makoto
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology:(Present office)National Agricultural Research Center for Kyushu Okinawa Region
  • Kurokawa Yuzo
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology:(Present office)Graduation School of Biosphere Science, Hiroshima University
  • Qing Hai
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology
  • Ebashi Kaori
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology:(Present office)Japan Agricultural Cooperatives of ZEN-NOH Ibaraki
  • Kamada Toshihiko
    United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology:(Present office)Faculty of Veterinary Nursing, Yamazaki Gakuen University

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Other Title
  • 異なる退牧時草高が輪換放牧下のシバ(Zoysia japonica Steud.)草地の植生と草地生産に及ぼす影響
  • コトナル タイボクジソウ コウ ガ リンカンホウボク カ ノ シバ Zoysia japonica Steud ソウチ ノ ショクセイ ト ソウチ セイサン ニ オヨボス エイキョウ

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Abstract

We studied two grazed pastures (10a×2) in order to establish an appropriate sward height at the end of grazing period to allow sustainable vegetation and pasture production under rotational grazing in Japanese lawngrass (JL) pasture. The herbage in the pastures was consumed by grazing cows until the sward height reached the low sward height (LS) of 5cm or the high sward height (HS) of 10cm during each rotational grazing period in 2006 and 2007. In JL-covered areas in the pastures, JL maintained its domination both in LS and HS pasture, while plants other than JL increased in HS pasture. Though the dominance of unpalatable plants in non-JL-covered areas increased in HS pasture, it did not increase in LS pasture. A decrease in the regrowth rate of aboveground biomass and herbage consumption in HS pasture was observed. The total number of grazing cows in both years was more than 1.3 times larger in LS pasture (over 900 cow-day ha^<-1> year^<-1>) compared to that in HS pasture. Therefore, in rotationally grazed JL pasture, the sward height at the end of each grazing period must be considered as part of the grazing management.

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