Case studies for estimation nitrogen and phosphorous balance with different cropping systems in upland

Cropping system is very important for environment conservation and improvement of nutrient recovery rates in agricultural land. This case study was conducted to identify the nutrient balance of major upland cropping types with different districts. Typical cropping systems at MuAn and HaeNam located in the south coast district were cultivated with soybean-chinese cabbage or garlic and garlic-soybean-chinese cabbage-hot pepper. Alpine district, PyeongChang was cultivated with double cropping of chinese cabbage and potato-radish or chinese cabbage for one year. Typical cropping type of AnDong, YeongYang where are well known for hot pepper cultivation was hot pepper's mono cropping and hot pepper-soybean or hot pepper-sesame for one year. But SeoSan and HongSeong, where are located in mid-west coast had variety cropping system compareed to other districts. Double cropping of chinese cabbage, a heavy fertilizing crop, caused higher nutrient balance in the field when it was cultivated consistently. Experiment showed that heavy fertilizing crops, such as chinese cabbage, garlic and onion, need to be rotated with soybean and sesame cultivation which need smaller fertilizer level. Alpine arable land has shown higher nutrient balance than other areas, and the introduction of rotation crops are needed to reduce nutrient balance and environmental protection.

현장사례를 통한 밭 작부의 질소와 인산양분 수지 평가

밭작물의 양분효율 증진을 도모코자 몇몇 지역의 대표작물을 중심으로 행해지는 작부유형을 조사하고 이의 작부유형별 양분수지를 분석하였다. 해남, 무안의 경우 마늘,양파 및 월동배추의 동작물과 콩, 참깨 등 시비량이 적은 하작물의 작부가 많았으며, 반면 평창은 배추를 년 간 2기작 재배 또는 봄 감자-가을배추 또는 무 재배가 전형적인 작부로 하작물 위주였다. 고추재배가 중심인 안동과 영양은 고추단작 그리고 고추-콩 또는 참깨가 주요 작부 유형이었으며, 중서부 해안지역인 홍성과 서산은 타 지역에 비해 비교적 작부유형이 다양한 편이였다. 작부유형별 양분수지는 배추를 1년 2기작 재배할 경우 질소 및 인산수지 모두 가장 높게 평가되어 환경적, 경제적 측면을 고려할 때 불리한 작부유형으로 나타났다.