Effects of organic manures on production of lettuce (Lactuca sativa L.) in reference to chemical fertilizer
2004
Paudel, Krishna Prasad(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Horticulture) | Sutevee Sukprakarn(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Agriculture. Department of Horticulture) | Krung Sidathani(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Tropical Vegetable Research Center) | Yongyut Osotsapar(Kasetsart University. Kamphaeng Saen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture. Department of Soil Science)
Effect of three types of organic manures, its combination within and with chemical fertilizer was studied under the nylon net house. A lettuce cultivar of Green Fancy was grown during December, 2002, February and April 2003. The same amount of nitrogen from organic manures and chemical fertilizers was applied to the experimental plots for each crop. Cow dung (CD), chicken manure (CM) and duck manure (DM) were applied 4.5, 4.7 and 5.8 t/ha, respectively, contributing 81 kg nitrogen each. In the case of combination treatments each combination contributed 1:1 ratio of nitrogen. A treatment with recommended dose of chemical fertilizer (CF) providing 81 kg nitrogen was also included. The crop grown with 4.7 t/ha of CM alone and its combination with CF (2.35 ton CM plus 156 kg complete fertilizer i.e., 15-15-15 together with 82 kg/ha of ammonium sulfate) gave a significantly higher yield throughout the crop season. Combination treatments within organic manures did not establish any statistical significance. In spite of the differences in total yield, fiber content and dry matter percentage showed not significant results irrespective of treatments and crop seasons.
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