Effects of the Application of Livestock Manure Compost on Reducing the Chemical Fertilizer Use for the Lettuce Cultivation in Green House
2011
Kang, C.S., Gyeonggido Agricultural Research and Extension Services, Whaseong, Republic of Korea | Roh, A.S., Gyeonggido Agricultural Research and Extension Services, Whaseong, Republic of Korea | Kim, S.K., Gyeonggido Agricultural Research and Extension Services, Whaseong, Republic of Korea | Park, K.Y., Gyeonggido Agricultural Research and Extension Services, Whaseong, Republic of Korea
Livestock manure compost (LC) generally contains high content of phosphorus, therefore can be a substitute for phosphorus fertilizers. In this experiment of the cultivation of lettuce in green house, the possibility of LC as a subsitute for phosphorus fertilizer was investigated and the fertilizer efficiency of nitrogen and potassium in LC as compared with chemical N fertilizer (urea) and K fertilizer (potassium chloride) was examined. In proportion to the increase in the application rate of nitrogen fertilizer, soil pH declined, whereas EC and NO₃-N content became higher. The application of LC appeared to increase the soil content of organic matter, available phosphate, exchangeable calcium, magnesium and sodium more than that of chemical fertilizer. Supplementation of the K fertilizer by the lack amount from the application of LC resulted in the same exchangeable potassium content in soil with NPK plot in which N, P and K fertilizers were applied by the amount of soil test recommendation. The relationship between soil NO₃-N content and nitrogen application rate from fertilizer and compost showed as y=0.57717a+0.19760b+74.65 (R²=0.6347) in which y is the soil NO₃-N content (mg kg-¹), a is nitrogen application rate from fertilizer and b is nitrogen application rate from compost (kg ha-¹), respectively. From this equation, the supply ability of NO₃-N into soil of LC exhibited about 34% (pig manure compost 37.0, chicken manure compost 34.7, cattle manure compost 23.3) of nitrogen fertilizer (urea).
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