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 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. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Phosphorus on Seed Oil and Protein Contents and Phosphorus Use Efficiency in Some Soybean Varieties) ผู้เขียน:Myo Win, ดร.สุตเขตต์ นาคะเสถียร, รองศาสตราจารย์, ดร.เอ็จ สโรบล, ศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractPhosphorus (P) uptake and utilization by soybean (Glycine max (L.) Merrill) is essential for plant growth. Therefore, this experiment was conducted to evaluate the P effects on selected soybean varieties based on the seed oil content (SOC) and the seed protein content (SPC) and to assess the physiological responses associated with changes in shoot P-utilization efficiency (SPUE). The experiment was carried out during 2008 and 2009 with a split-plot design at the Agronomy Department, Kasetsart University, Bangkok, Thailand. The main plots were for tested three P levels in a nutrient solution (0.5, 1.0 and 2.0 mM P), with subplots for the three soybean cultivars, CKB1, SJ5 and CM60. The results indicated that at maturity, the P levels of 2.0 mM P decreased SPUE by 27% compared to that of 0.5 mM P (the control). SOC was not significantly affected by the P level. Relative to the control, the P nutrition levels of 1.0 and 2.0 mM P significantly decreased SPC by 4% and 5%, respectively. There were no significant differences in SOC between varieties. The SPC of CKB1 was 8% greater than that of SJ5 but showed no significant difference to that of CM60. |