Abstract
In order to estimate the an adequate application level for dry matter production of orchardgrass(Dactylis glomerata L.) were investigated in different application levels of food waste compost and mineral nitrogen in 3 cuttings per annum, and to evaluated the soil improving effect of food waste compost. Annual food waste compost and mineral nitrogen were applied at levels of 0, 10, 20, 40 and $60ton\;ha^{-1}$, and 0, 90, 180 and $270kg\;ha^{-1}$, respectively. Significantly higher dry matter yield of orchardgrass obtained were ranges of $8.92{\sim}9.70ton\;ha-1$ at levels of $180{\sim}270kg\;ha^{-1}\;yr^{-1}$ than that of other levels of mineral nitrogen. Relative yield of each cut to annual dry matter yield were 32.0% 49.2% and 18.8% for 1st cut, 2nd cut and 3rd cut in mineral nitrogen treatment. Significantly higher dry matter yield of orchardgrass obtained were ranges of $8.04{\sim}8.90ton\;ha^{-1}$ at levels of $20{\sim}60ton\;ha^{-1}\;yr^{-1}$ than that of other levels of food waste compost. The efficiency of dry matter production to application of mineral nitrogen(kg DM $kg^{-1}$ N) were 21.2, 19.0 and 15.6kg at levels of 90, 180 and $270kg\;ha^{-1}\;yr^{-1}$, respectively. Higher efficiency of dry matter Production obtained were 27.6~20.2 kg at levels of $90{\sim}180kg\;ha^{-1}$ of mineral nitrogen applied to $20ton\;ha^{-1}$ of food waste compost, it may due to accelerated mineralization by mineral nitrogen application. Highest efficiency of dry matter production to application of food waste compost (kg DM $ton^{-1}$ FWC) obtained was 71.0 kg at level of $40ton\;ha^{-1}\;yr^{-1}$. Maximum dry matter yield of orchardgrass obtained were $9.98ton\;ha^{-1}$ at limiting level of mineral nitrogen of $358.5kg\;ha^{-1}$ and $9.12ton\;ha^{-1}$ at limiting level of food waste compost of $49.3ton\;ha^{-1}$ per annum, respectively. Ranges of $20{\sim}49.3ton\;ha^{-1}$ of food waste compost and $180{\sim}358.5kg\;ha^{-1}$ of mineral nitrogen were estimated an adequate levels for increase in dry matter production, and to maintenance for orchardgrass pastures. Application of food waste compost was affected to improve the soil characteristics.
음식물쓰레기 퇴비와 무기태 질소의 시용이 연간 3회 예취하는 orchardgrass 초지의 건물수량에 미치는 영향을 조사하여 퇴비와 무기태 질소의 적정 사용수준을 추정하고, 퇴비시용에 의한 토양개량효과를 평가하였다. 음식물쓰레기 퇴비는 연간 0, 10, 20, 40, $60ton\;ha^{-1}$의 5수준, 그리고 무기태 질소는 0, 90, 180, $270kg\;ha^{-1}$의 4수준으로 시용하였다. Orchardgrass의 연간 건물수량은 무기태질소 $180{\sim}270kg\;ha^{-1}$ 준에서 $8.92{\sim}9.70ton\;ha^{-1}$을 나타내어 다른 시용수준보다 건물수량이 많았다. 무기태 질소시용구에서 예취번초의 상대수량은 1번초가 32.0%, 2번초가 49.2%, 3번초가 18.8%였다. Orchardgrass의 연간 건물수량은 퇴비 $20{\sim}60ton\;ha^{-1}$ 수준에서 $8.04{\sim}8.90ton\;ha^{-1}$을 나타내어 유의하게 많았다. 무기태 질소의 건물생산효율은 $90kg\;ha^{-1}$ 수준에서 21.2 kg, $180kg\;ha^{-1}$ 수준에서 19.0 kg, $270kg\;ha^{-1}$ 수준에서 15.6 kg을 나타내었다. 퇴비의 건물생산효율은 $20ton\;ha^{-1}\;yr^{-1}$ 수준에서 가장 높은 71 kg을 나타내었다. 퇴비 $40ton\;ha^{-1}$ 수준에 무기태 질소 $90{\sim}180kg\;ha^{-1}$을 시용하였을 때의 건물생산효율은 20.2~27.6 kg의 높은 건물생산효율의 범위를 나타내어 무기태 질소가 음식쓰레기 퇴비의 무기화를 촉진하였다고 생각된다. 무기태 질소의 한계시용수준은 $358.5kg\;ha^{-1}$이었고, 최대건물수량은 $9.98ton\;ha^{-1}$이었다. 또한 퇴비의 한계시용수준은 $49.3ton\;ha^{-1}$이었고, 최대건물수량은 $9.12ton\;ha^{-1}$으로 추정되었다. Orchardgrass의 건물수량은 얻기위한 퇴비의 적정 시용수준은 연간 $20{\sim}49.3ton\;ha^{-1}$의 범위였고, 무기태 질소의 적정 시용수준은 $180{\sim}358.5kg\;ha^{-1}$의 범위로 추정되었다. 퇴비시용에 의하여 토양개량효과가 인정되었다.
(Dept. of Biological Resources & Technology, Yonsei University)
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