본 연구는 폐자원 재활용 측면에서 농업적 유용활용(beneficial use)이 가능할 것으로 판단되는 영가철과 석탄회로 제조한 토양개량제를 투입하여 토양 염류 농도와 작물 생산량에 미치는 영향을 배양시험과 재배시험으로 평가하였다. 토양개량제는 석탄회를 구형으로 제형하고 영가철이 함유된 용액(0.1, 1.0%)을 표면에 살포하여 제조하였다. 토양개량제는 밭토양으로 충진된 와그너포트에 40 g/10a과 400 g/10a를 처리하였고, 30일 간 배양한 후 토양 EC와 염 농도를 분석하였다. 토양의 EC는 400 g/10a 실험구에서 대조구 대비 약 50% 감소한 것으로 나타났다. 국내 대표적인 염류인 유효인산의 경우 개량제의 처리 후 1/3 수준으로 감소되었다. 개량제 처리에 따른 토양 내 EC와 염 농도의 감소는 매우 유의한 수준으로 분석되었다(r=0.672~0.985). 또한 개량제 처리 후 뿌리와 줄기의 생육은 약 10% 증가였고, 건중량 또한 대조구에 비해 줄기와 뿌리에서 각각 30-50%와 60-75% 유의하게 증가하였다. 석탄회와 영가철을 농업용 토양개량제로 재활용할 경우 농업 환경 개선뿐만 아니라 농업 생산성 증대에도 기여할 수 있을 것으로 판단된다.
본 연구는 폐자원 재활용 측면에서 농업적 유용활용(beneficial use)이 가능할 것으로 판단되는 영가철과 석탄회로 제조한 토양개량제를 투입하여 토양 염류 농도와 작물 생산량에 미치는 영향을 배양시험과 재배시험으로 평가하였다. 토양개량제는 석탄회를 구형으로 제형하고 영가철이 함유된 용액(0.1, 1.0%)을 표면에 살포하여 제조하였다. 토양개량제는 밭토양으로 충진된 와그너포트에 40 g/10a과 400 g/10a를 처리하였고, 30일 간 배양한 후 토양 EC와 염 농도를 분석하였다. 토양의 EC는 400 g/10a 실험구에서 대조구 대비 약 50% 감소한 것으로 나타났다. 국내 대표적인 염류인 유효인산의 경우 개량제의 처리 후 1/3 수준으로 감소되었다. 개량제 처리에 따른 토양 내 EC와 염 농도의 감소는 매우 유의한 수준으로 분석되었다(r=0.672~0.985). 또한 개량제 처리 후 뿌리와 줄기의 생육은 약 10% 증가였고, 건중량 또한 대조구에 비해 줄기와 뿌리에서 각각 30-50%와 60-75% 유의하게 증가하였다. 석탄회와 영가철을 농업용 토양개량제로 재활용할 경우 농업 환경 개선뿐만 아니라 농업 생산성 증대에도 기여할 수 있을 것으로 판단된다.
BACKGROUND: Cultivation area using agricultural plastic film facilities in Korea is rapidly increasing every year; however, it accelerates the salt accumulation in soils due to repeated cultivation and excessive use of chemical fertilizers. Coal ash contains various trace elements and has high poten...
BACKGROUND: Cultivation area using agricultural plastic film facilities in Korea is rapidly increasing every year; however, it accelerates the salt accumulation in soils due to repeated cultivation and excessive use of chemical fertilizers. Coal ash contains various trace elements and has high potential to be used in agricultural purposes. This research was aimed to improve the quality of salts-accumulated soils and crop growth grown in the plastic film facilities using the soil amendment derived from coal ash and zero-valent iron powder. METHODS AND RESULTS: Soil amendment used in the study was manufactured using coal ash with iron powder and subjected to a typical upland soil for soil quality enhancement and two salts-accumulated soils for crop growth. After one month incubation of the salts-accumulated soils treated with the soil amendment, soil pH increased significantly and soil EC decreased by approximately 50%, compared to the control or the treatment without the soil amendment. Since the soil salts' concentration is proportional to EC, the subjected soil amendment can be proposed as an effective way to overcome soil salts accumulation in agricultural plastic film facilities. For crop growth, the length of roots and stems increased by approximately 10% and the dry weight also increased by a maximum of 75%, compared to the control. CONCLUSION: The soil amendment made from waste resources such as coal ash and zero-valent iron was found to not only be effective in improving salt-accumulated soils and crop yield but also be safe against harmful heavy metals.
BACKGROUND: Cultivation area using agricultural plastic film facilities in Korea is rapidly increasing every year; however, it accelerates the salt accumulation in soils due to repeated cultivation and excessive use of chemical fertilizers. Coal ash contains various trace elements and has high potential to be used in agricultural purposes. This research was aimed to improve the quality of salts-accumulated soils and crop growth grown in the plastic film facilities using the soil amendment derived from coal ash and zero-valent iron powder. METHODS AND RESULTS: Soil amendment used in the study was manufactured using coal ash with iron powder and subjected to a typical upland soil for soil quality enhancement and two salts-accumulated soils for crop growth. After one month incubation of the salts-accumulated soils treated with the soil amendment, soil pH increased significantly and soil EC decreased by approximately 50%, compared to the control or the treatment without the soil amendment. Since the soil salts' concentration is proportional to EC, the subjected soil amendment can be proposed as an effective way to overcome soil salts accumulation in agricultural plastic film facilities. For crop growth, the length of roots and stems increased by approximately 10% and the dry weight also increased by a maximum of 75%, compared to the control. CONCLUSION: The soil amendment made from waste resources such as coal ash and zero-valent iron was found to not only be effective in improving salt-accumulated soils and crop yield but also be safe against harmful heavy metals.
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