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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Responses of Specific Leaf Weight, Biomass and Seed Yield of Soybean to Nitrogen Starter Rate and Plant Density) ผู้เขียน: Myint Myint Maw,  ดร.สุตเขตต์ นาคะเสถียร, รองศาสตราจารย์ , ดร.เอ็จ สโรบล, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractThe combined effects of fertilizer and plant population density (PPD) on specific leaf weight (SLW), plant biomass, grain yield and quality of soybean (Glycine max (L.) Merrill) and relationships between these traits are of considerable interest. The purpose of this study was to investigate the response of SLW, biomass distribution in plant parts and seed yield of soybean to nitrogen (N) application and PPD levels. Field experiments were established during the wet season (June to October) and the dry season (November to March) in 2008-2009, using a split-plot design with three replications. The SJ5 cultivar was planted at the National Corn and Sorghum Research Center, Nakhon Ratchasima, Thailand. Four levels of PPD (20, 30, 40, 60 plants m-2) were used as main plots and four rates of N fertilizer (0, 25, 50, 75 kg ha-1) were applied as sub-plots. There were no interactions between PPD levels and N rates in all observations. In both seasons, the greatest SLW was measured at the highest N level (N75) and the lowest value was detected at the highest PPD (60 plants m-2). The SLW at V5 was positively correlated with dry weight (DW) at V5 (r = 0.593*) in the wet season, and with DW at V5 (r = 0.727**) and DW at R5 (r = 0.695**) in the dry season. Accordingly, the highest biomass yield with N75 might be related with SLW at V5. Compared to the control, N75 increased the whole plant biomass at R5 by 14 and 53% in the wet and dry seasons, respectively. The greatest seed yield in both seasons was observed at N75. Pods plant-1 and seed size were the main yield components responsible for a higher seed yield of N75. Significant differences in seed yield among PPD levels were not observed, indicating that a plant density of 20 plant m-2 with N75 would be appropriate for soybean cv. SJ5 sown at the National Corn and Sorghum Research Center in both the wet and dry seasons. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effect of Nitrate Levels on Nitrogen Accumulation, Seed Yield and Quality of Soybean Cultivars) ผู้เขียน:Myint Myint Maw, ดร.สุตเขตต์ นาคะเสถียร, รองศาสตราจารย์, ดร.เอ็จ สโรบล, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractSoybeans (Glycine max [L.] Merr.) were grown in nutrient culture containing various concentrations of NO3 - in the forms of KNO3 and Ca(NO3)2. The objective was to evaluate the seed yield and quality responses of soybean cultivars to NO3 - solution. The experiment was conducted in a hydroponic solution using a split plot in randomized complete blocks with three replications in the greenhouse at the Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok, Thailand. Three levels of NO3 - (5, 10, 15 mM) formed the main plots and three soybean cultivars (CKB1, SJ5, CM60) were the sub-plots. Nitrate application increased the yield of soybean cultivars and this increase was mainly associated with dry matter accumulation in leaves at R5. In comparison with the control (5 mM), the highest NO3 - level (15 mM) resulted in higher leaf N accumulation at the R5 stage by an average of 82, 37 and 32% for SJ5, CKB1 and CM60, respectively. The maximum seed yield (41.43 g plant-1) produced by the SJ5 cultivar under the highest NO3 - level seemed to be supported by the significantly largest value of whole plant biomass and nitrogen content (%) in leaves at the R5 stage. |
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