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http://dx.doi.org/10.17137/korrae.2020.28.3.27

Change in Fertilizer Characteristics during Fermenting Process of Organic Fertilizer and Effect on Lettuce Growth  

An, Nan-Hee (Organic Agriculture Division, National Institute of Agricultural Science)
Lee, Sang-min (Organic Agriculture Division, National Institute of Agricultural Science)
Oh, Eun-mi (Organic Agriculture Division, National Institute of Agricultural Science)
Lee, Cho-Rong (Organic Agriculture Division, National Institute of Agricultural Science)
Gong, Min-Jae (Organic Agriculture Division, National Institute of Agricultural Science)
Publication Information
Journal of the Korea Organic Resources Recycling Association / v.28, no.3, 2020 , pp. 27-36 More about this Journal
Abstract
This study investigates the changes in inorganic composition and the microbial counts during the process of fermentation of mixed domestic organic resources for the development of alternatives for imported oil cake, and examines the characteristics of mixed fermentation organic fertilizer (MFOF). The effect of the MFOF on the lettuce growth is investigated in order to evaluate the possibility of replacing the existing mixed oil cake with the MFOF. Six kinds of domestic by-product resources, which are rice bran, distiller's dried grains, sesame meal, fish meal, and spent mushroom substrate, are mixed by mixing ratio and the composition was analyzed during the fermentation process for 90 days under moisture content 30% and sealed condition. During the 90 days of fermentation, the pH change of the MFOF was little, and the moisture content was maintained at 34-35% until the 60th day of fermentation, and then decreased to 30-31% on the 90th day. Total nitrogen content remained unchanged during the fermentation period, but total carbon content showed a significant difference on the 21st day of fermentation. It was confirmed that the content of fertilizer composition (nitrogen, phosphate, and potash) of the MFOF was 8.7% or more, which is suitable for the minimum amount standard of the main nutrients to be contained in the organic fertilizer. During the fermentation process of organic fertilizer, the density of bacteria and actinomycetes increased until 60 days and 30 days, respectively, and thereafter little changes were shown, and fungal population showed an increasing trend. As a result of lettuce cultivation test in the greenhouse by applying the MFOF, the growth and yield were comparable to that of using the existing mixed oil cake fertilizer when 100% was applied based on crop standard nitrogen fertilizer level. The use of mixed fermentation organic fertilizer made with domestic by-product resources can be used for use in farms in the future and is expected to contribute to the stable production of environment friendly agricultural products.
Keywords
agricultural by-products; fertilizer source; castor oil-cakes; organic fertilizer;
Citations & Related Records
Times Cited By KSCI : 10  (Citation Analysis)
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