친환경농업(親環境農業) 상추재배의 EM(유효미생물군(有效微生物群)) 미생물제제 시용효과(施用效果)에 관한 연구(硏究) = The Study of Effects of the EM (Effective Microorganisms) on Organic Agriculture of Lactuca sativa L. (Leaf Type)

다국어 초록 (Multilingual Abstract)

This study was conducted to investigate the effects of EM(Effective Microorganisms) on growth and quality of lettuce for system of organic agriculture. Chemical characteristics such as soil acidity, organic matters, and conductivity were nor significantly changed between before and after the experiment. Those were not different between treated and untreated. Therefore treatment of EM did not affect on chemical characteristics of soil. Total production of EM and chemical fertilizer treated plants were 22.6 to 33.6% more than that of untreated plant. Ratio of total weight from dry weight were 22.0 to 32.2% in above ground part of plant and 31.0 to 43.7% in under ground plant. However there was no difference between EM and chemical fertilizer treated of total production. Leaf production of EM and chemical fertilizer treated plants were 27.1 to 30.4% more than that of untreated plant. However there was no difference between EM and chemical fertilizer treated plants. Therefore EM application on organic agriculture may have effective on reclamation of soil eco-system and improvement of plant cultivation environment without any yield loss. Calorie and general contents such as water, fat, protein, and carbohydrate were not different between treated and untreated plant. Inorganic matters such as T-N, P2O5, K2O, CaO, and MgO were also not different. Vitamin C contents were 11.7, 14.3~15.8, and 17.5mg/100g in chemical, EM, and untreated plants, respectively. However nitrates contents were 132, 78~81, and 72mg/100g in chemical, EM, and untreated plants, respectively. Therefore vitamin C and nitrate contents were negatively correlated. EM treatment did not produce any malformation and, less differences among newly formed leaf form a original individual. Lettuce treated with EM did not have any problem on quality and did not give any aversion to people. Therefore use of EM could produce organic agriculture without any damage to plant when it is used in the way as used in this study.