The present invention relates to a kitchen obtained from chitin which is easily decomposed in nature. When the water-soluble kitchen-chitosan oligosaccharide obtained by chemical or enzymatic method from the chitosan is chemically or enzymatically obtained, the water-soluble kitchen-chitosan oligosaccharide is prepared so that the plant can immediately absorb the water-soluble chitosan oligosaccharide. When the soil is sprayed or dissolved in water, Soil with effective effects such as growth inhibition, growth promotion of useful soil microorganism, prevention of pest disease, improvement of bibility, promotion of growth, promotion of rooting, increase in seedling, increase in sugar content, increase in sugar content, prevention of fallout, Improving agents, fertilizers and fertilizer compositions.
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