Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Method of Environmental-Friendly Fertilization for Rice Cultivation after Vegetable Copping in Green House Soil

시설재배 후작 벼 재배를 위한 친환경적 시비 기술

  • Published : 2005.06.30
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Abstract

Green house soils have been intensively cultivated with excessive application of compost and chemical fertilizer for vegetable growth. The objective of this study was to establish the reasonable fertilizer application system for rice cultivation in green house soil. Field experiment was carried out with rice cv. Geumo-byeo 1 in Jisan series soil (fine loamy, mixed, mesic family of Fluventic Haplaquepts) that was previously cropped with green pepper (Capsicum annuum L.) for the last 3 years. Treatment consisted of conventional fertilization $(N-P_2O_5-K_2O=11-4.5-5.7kg\;10a^{-1})$, no basal fertilization, 50% reduction of basal fertilization no top dressing, bulk blending fertilizer, and no fertilizer. The value of pH, available phosphate, and exchangeable potassium after experiment was lower than those before experiment while organic matter content was not difference in all treatment. The value of salt elusion was the highest in no basal fertilization plot. The amount of $NH_4-N$ in soil was higher in growth stage of rice as fertilizer amount increased in 1998. The changes of plant height and tiller were higher as fertilizer amount increased. Thousand-grain weight as yield component was higher in no basal fertilization plot all the year because of decreasing panicle. There was no significant difference in rice yield between treatments in 1998. However, conventional fertilization resulted in significantly increased rice yield in 1999. Nitrogen use efficiency was the highest in no basal fertilization plot in 1998 and in conventional fertilization plot in 1998. Our results suggest that no basal fertilization be best to increase salt elusion with slightly increased yield in first year for rice cropping after vegetable harvesting, which method improves fertilization efficiency. However, conventional fertilization was good for second rice cropping after vegetable harvesting in greenhouse.

본 시험은 영남지역 과채류 등의 시설재배지 후작으로 벼 재배시 합리적인 시비법에 대한 체계를 확립하여 농자재 절감, 각종 재해 방지 및 수질오염 방지 등을 통한 환경 농업의 기초자료 얻고자 시험을 수행한 결과를 요약하면 다음과 같다. 시험 후 토양의 화학적 특성은 시험전 토양에 비하여 pH, 유효인산, 치환성 칼리는 감소하였으나 유기물은 큰 차이가 없는 경향이었고 EC로부터 산출한 제염의 정도인 제염률은 기비생략구가 높은 경향이었다. 주요시기별 토양 중 $NH_4-N$의 변화는 '98년보다 '99년도가 다소 높은 경향이었다. 시비량이 많을수록 높았다. 주요시기별 초장과 경수의 변화도 토양 $NH_4-N$과 동일한 경향이었다. 수확기 벼 식물체의 T-N은 '98년도에 일정한 경향이 없었고, '99년도에는 시비량이 많을수록 높은 경향이었다. 수량 및 수량구성요소는 '99년에 천립중이 높았고 수당립수도 많은 경향이었다. 수량은 '98년엔 처리간 차이가 없었다. '99년도에는 관행구에서 높은 경향이었다. 시비 질소 이용률은 '98년에는 기비 생략구에서 높았고 '99년도는 관행구에서 높은 경향이었다. 따라서 당해연도에 시설원예작물이 재배된 경우에 후작으로 벼 재배시 기비생략 등의 감비재배법이 비료절감, 수질오염 경감, 안정적 수량 확보 등의 이점이 있을 것으로 생각된다. 그러나 벼 재배 2년차부터는 관행시비가 가능할 것으로 생각되었다.

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References

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