Labor-saving Stocking Management of Kentucky Bluegrass (<i>Poa pratensis</i> L.) Dominant Pasture. 2. Effect of early turning out to pasture and reduced fertilizer rate on animal performance and herbage production in set stocking

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  • ケンタッキーブルーグラス（<i>Poa pratensis</i> L.）を基幹とする放牧草地の省力的利用管理技術　2．固定放牧条件下における減肥と早期入牧が家畜や草地の生産性に及ぼす影響
  • ケンタッキーブルーグラス(Poa pratensis L.)を基幹とする放牧草地の省力的利用管理技術(2)固定放牧条件下における減肥と早期入牧が家畜や草地の生産性に及ぼす影響
  • ケンタッキーブルーグラス(Poa pratensis L.)オ キカン ト スル ホウボク クサチ ノ ショウリョクテキ リヨウ カンリ ギジュツ(2)コテイ ホウボク ジョウケン カ ニ オケル ゲンヒ ト ソウキ ニュウボク ガ カチク ヤ クサチ ノ セイサンセイ ニ オヨボス エイキョウ

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Abstract

<p>To establish a labor-saving cattle stocking management regime for Kentucky bluegrass (Poa pratensis L.) and white clover (Trifolium repens L.) mixed sward, the effects of early turning out to pasture and reduced fertilizer rate on animal performance and herbage production in set grazing were investigated for 3 years in Hokkaido. On the control plot (with standard management), grazing was started at a plant length of 12-14 cm, and the sward received 3 fertilizer applications equating to 72, 96 and 132 kg/ha/year of N, P2O5 and K2O, respectively. On the plot with the improved management, grazing was started at a plant length of 4-5 cm, and the annual fertilization rate was reduced to one-third of that in the control, with the aim of reducing the magnitude of seasonal fluctuation of sward productivity. On the improved management plot, the spring flash in June was suppressed, and the dry matter ratio of white clover was higher than that in the control plot. Moreover, stocking capacity (547 cow-day/ha) and body weight gain (862 kg/ha and 0.981 kg/head/day) observed for the improved management plot were equivalent to those observed for the control plot. It was concluded that the early turning out to pasture and reduced fertilizer rate were effective for labor-saving stocking management regime on the Kentucky bluegrass and white clover mixed sward under set stocking in Japanese subarctic areas.</p>

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