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배수로 물 관개 벼농사의 비점오염원 경감효과

Use of Drainage Water as Irrigation Resource in the Paddy Field to Mitigate Non- point Source Pollutants

박성태|이재생|정기열|고지연|김춘송|구연충|강항원
한국환경농학회 (The Korean Society Of Environmental Agriculture)|2007.06|한국환경농학회지 (Agricultural and Environmental Sciences)|제30권 제2호|pp. 107-115

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참고문헌

주제분류농학

초록

본 연구는 농경지와 농촌마을로부터 발생하여 소하천으로 유입되는 비점오염물질을 경감시키기 위하여 농업간선배수로 끝의 논에서 배수로 물을 관개수로 이용하였을 때 수질정화효과를 살펴보고, 비점오염물질 정화를 위한 효과적인 벼 재배양식을 탐색하기 위하여 수행하였다. 모든 벼 재배양식에서 하천으로 유입되는 비점오염물질이 정화되는 효과를 확인할 수 있었다. 잡초의 건물량을 포함한 벼 재배양식별 총건물생산능력은 기계이앙재배에서 가장 높았으나, 무경운자연재배와는 차이가 적었고, 비점오염물질인 T-N과 P2O5, K2O의 흡수량은 기계이앙재배 > 무경운자연재배 > 건답직파재배 순으로 높았다. 벼 전 생육기간동안 Table 7. Grain quality of brown rice and palatability as affected by different rice cultivation practicesCultivations

Abstract

Objective of this study was to assess the efficient rice cultivation practice to mitigate the non-point source pollutants loading to the adjacent watershed. Cultivation practices consisted of machine transplanting, direct seeding on dry paddy, and no tillage in which no fertilizer and pesticide were applied to paddy field. Water in drainage canal was used as irrigation source during the entire rice growing season. Loading of the non-point source pollutants to the adjacent small stream was mitigated by all treatments. Rice yield, total biomass (rice + weeds), and uptake of T-N, P2O5, and K2O were higher in machine transplanting practice than those in direct seeding and no tillage practices. However, the purification effects of non-point source pollutants were followed in orders of no tillage > direct seeding > machine transplanting due to quantity of irrigation water. The annual purification quantity of T-N, T-P, and K by rice cultivations ranged from 46 to 369 kg ha-1, 4.1 to 16.4 kg ha-1, and 55 to 238 kg ha-1, respectively, during the entire rice growing season. Results revealed that no tillage practice of rice cultivation was the best management option in reducing the loading of the non-point source pollutants from the drainage canal into stream.

참고문헌 (25)

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