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KMID : 0525720160210020118
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Journal of Chitin and Chitosan
2016 Volume.21 No. 2 p.118 ~ p.127
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Development of Chemical Fertilizer Substitute Type Organo-Mineral Fertilizer Evaluation on the Efficiency of Fertilizer for Nutrient Solution Fertilizer OCHT-F Manufactured with Chitosan as a Substrate Targeting Lettuce
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Noh Hye-Ji
Cho Hyang-Hyun
Lee Chul-Kyu
Kim Hee-Kyong
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Abstract
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The present study has conducted a fertilizer equivalency test for 10 weeks under the condition of soil cultivation in a facility house, targeting lettuce (Lactuca sativa L, Jeok Chi Ma) with OCHT-F as a test fertilizer, which has been manufactured by chelating essential minerals with Chitosan-oligosaccharide (Hereinafter “OCHT”) substrate to solve the demerit of existing chemical fertilizers (declination of body absorption capability, cohesion and sedimentation out of ion bonding, necessity of nutrient solution supply system, accumulation of soil salt and environmental contamination). OCHT-F has been manufactured with a type of powder compound fertilizer to have chemical fertilizer Ringer-F, fertilizer composition and NPK content to be 9.2%: 3.78%: 30.5%. As for its characteristic, it has non-sedimentary and water-soluble pattern and its molecular weight is 500 or less. It secures an optimum physical property regarding the root absorption of minerals and an enhancement of bioavailability. OCHT-F can be mixed with general water immediately without an exclusive nutrient solution system to secure the convenience to fertilization. A simultaneous fertilization was possible for soil drench and foliar or foliar.soil drench. In addition, sedimentation has not occurred by chemical reaction at dissolution different from chemical fertilizer. It was the range of a general exclusive nutrient solution fertilizer with 1,000~4,000 times at use. In evaluation regarding safety, the safety of Ringer-F and OCHT-F has been confirmed in entire concentration range (p<0.05). As a result of onsite evaluation on OCHT-F, its superiority has been confirmed which shows the effect of growth stimulation in both aerial part and rhizosphere portion not only within normal (21 o C) temperature of soil but also within high (25~31 o C) temperature range along with the strengthening of tissue density (control: 5.18%, Ringer-F: 5.11~6.04%, OCHT-F: 4.77~5.61%) and increasing effectRinger-F: 118~122%, OCHT-F: 104~118%) of high harvest (p<0.05). Conclusively, it has been confirmed that OCHT-F manufactured with Chitosan as a substrate procures an excellent efficiency of fertilizer that increases growth and harvest simultaneously solving the existing problems of chemical fertilizers such as the sedimentation phenomenon, the body absorption capability of minerals and the installation and use of exclusive nutrient solution system.
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KEYWORD
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Nutrient Solution Agriculture, Fertilizer, chitosan Substrate, Lettuce
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