논의 경운방법 (耕耘方法) 이 연차간 벼수량과 토양특성에 미치는 영향

Field experiment was carried out to investigate the annual changes of rice yield and soil properties. Hwaseongbyeo was cultivated by different tillage methods and fertilizer levels for 5 years in the paddy soil. Tilth efficiency of power tiller(PT) rotary plot was higher by 74.8%, but that of tractor tillage plot was lower by 59.0%. Water requirement in depth of no-tillage plots after rice transplanting was highest and also those of the early growing stage was higher than those of the middle growing stage. Rice yield of PT rotary plot by recommended fertilizer application was increased by 17% than that of no-tillage plot by conventional fertilizer application. By the rotary of PT and tractor, rice yield increased by 6∼17% than those of no-tillage. In case of cultivating years, rice yield of 2nd year was highest, but that of 4th year was lowest. Sail bulk density and solid phase of no-tillage plot which took not tillage were highest than the other plots. The changes of soil chemical properties in the all treatments had not definite tendency.