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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Organic Manures on Production of Lettuce
(Lactuca sativa L.) in Reference to Chemical Fertilizer) ผู้เขียน: Krishna PRASAD PAUDEL,  นางสุเทวี ศุขปราการ, รองศาสตราจารย์ , Krung Sidathani, Yongyut Osotsapar สื่อสิ่งพิมพ์:pdf AbstractThe 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. |
หัวเรื่อง:การพัฒนาและการแก่ของเมล็ดพันธุ์ผักกาดหอมชนิดต่างๆ ผู้เขียน:นางสุเทวี ศุขปราการ, รองศาสตราจารย์, Surapong Ratanakosol สื่อสิ่งพิมพ์:pdf AbstractFlowering pattern and seed development were studied to determine the optimum time of harvest for lettuce seed production. Lettuce plants showed the highest flowering peak at 72 days after transplanting (138 flowers/plant), 91 days after transplanting (226 flowers/plant) and 94 days after transplanting (205 flowers/plant) in leaf lettuce (cv. Grand Rapids) , butterhead (cv. Summer Queen) and head lettuce (cv. Great Lake 659), respectively. Seed of these three lettuce types reached their physiological maturity in 12 days after anthesis. |