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제주혼파초지에서 하고기 예취시기와 질소시비수준에 따른 목초생산의 계절적 변화
김문철,김영휘,조남기,이수일,이승협 濟州大學校 農科大學 動物科學硏究所 1993 動物科學論叢 Vol.8 No.1
To study management practices suitable for the least production loss of temperate pasture under summer stress. two different cutting dates (late June and mid July) under summer stress and five different nitrogen treatment application levels (0. 100. 200. 300 and 400 kg/ha) were tried during the trial period between Oct. of 1986 and Oct. of 1989. The late June cutting showed a statistically significant increase of dry matter yield of pasture in comparison with the mid-July cutting( P<0.05). Nitrogen application also gave significant increase in dry matter yield. Botanical composition at the 4th cuttings in 1988 and 1989 was dominated by weeds to the level of 50%. Application of nitro-gen at 200 kgs per ha was found to be the best with production of grasses at 70%. legumes at 10% and weeds at 20% in botanical composition comparison of pastures at the 4th cutting time the last year. showing a great decrease of weeds. K contents of pasture in June cuttings showed to be more than them in July cutting. and N and Na contents increased with increases of the nitrogen application level. It was concluded that treatment with June cutting and nitrogen application of 200kg per ha was a way to keep temperate pasture from summer stress in the Cheju area.