2019 ASHS Annual Conference

The purpose of this study was to investigate the effects of some organic fertilizers for the organic cultivation of maize and selection of a substitute for oil-cake in Goesan, Chungbuk province in 2018. As a result, nitrogen, phosphoric acid, potassium, calcium and magnesium contents of each organic fertilizer were in the order of oil-cake > amino acid fertilizer > fermented liquid fertilizer = compost tea. Each of these organic fertilizers had little influence on the chemical change of soil, but amino acid fertilizer and oil-cake for weight of an ear as well as all treatments for the fresh weight of 100 kernels showed significant increase, compared to the untreated control. After all, the market quality of corn from each treatment was in the range of 83.2∼86%, which was improved by 2.5∼5.9%. On the other hand, as a result of mixed treatment of amino acid fertilizer and compost tea to explore a substitute for oil-cake, the change of chemical property of soil was insignificant. The mixed treatment, nonetheless, showed significant increase for stem height to 1^st ear, grain setting length in an ear, weight of an ear, and fresh weight of 100 kernels, compared to the control. After all, the market quality of corn by the mixed treatment was 91.2%, which was 3.9% higher than the control. Therefore, our study is considered that the mixed treatment of amino acid and compost tea is an organic material that can replace oil-cake in maize.