 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Yield Response of Three Waxy Corn Varieties to Various Nitrogen Rates) ผู้เขียน: Suchada Boonlertnirun, Raweewun Suvarnasara, Kitti Boonlertnirun สื่อสิ่งพิมพ์:pdf AbstractNitrogen fertilizer is generally considered as a yield-limiting factor in corn production. This study was conducted at the Rajamangala University of Technology Suvarnabhumi, during May to July 2008. The objective was to investigate suitable N fertilizer rates in growing waxy corn. A split-plot design was used, with three waxy corn varieties (main plot), namely Neaw Sawan (NSW), Big White 852 (BW852) and Thein Ban Khao (TBK), and five nitrogen rates (sub plot) of 0, 75, 150, 225 and 300 kg ha-1. The results showed that NSW gave the highest yield, yield components and the maximum leaf area. The maximum leaf greenness value and dry weight were observed in BW852. TBK rarely responded to various nitrogen rates. The application of nitrogen at rates of 150 kg ha-1 up to 250 kg ha-1 significantly increased the leaf greenness of all varieties and increased the dry weight and leaf area of BW852 and TBK, whereas NSW showed the highest dry weight and leaf area when nitrogen was applied at the rate of 75 kg ha-1. The plant height of all varieties was not affected by variation in the nitrogen rate. The yield of all varieties tended to increase after applying nitrogen at 150 kg ha-1 up to 250 kg ha-1; however the optimum nitrogen rate to increase the yield of BW852 and NSW was 150 and 225 kg ha-1, respectively, whereas there was no effect on the yield of TBK. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Molecular Weight of Chitosan on Yield Potential of Rice Cultivar Suphan Buri 1) ผู้เขียน:Suchada Boonlertnirun,  ดร.เอ็จ สโรบล, ศาสตราจารย์ , นางอิสรา สุขสถาน, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractChitosan is a natural polymer extracted from chitin. It can be applied to plants in order to increase yield. The aims of this study were to determine the effective type of chitosan and the appropriate method for increasing rice yield. The experimental design was 3 ? 3 factorial in RCB with one control and replicated four times. The factor A was seed soaking, seed soaking + foliar spraying and foliar spray; the factor B was polymeric chitosan, oligomeric chitosan and monomeric chitosan. The mixed chemical fertilizer between 46-0-0 and 16-20-0 ( ratio 1:1w/w) at the rate of 50 kg/rai was applied to the rice plants of all treatments, but without chitosan in the control treatment. This study was conducted in pot experiment in a greenhouse at Rajamangala University of Technology Suvarnabhumi during January to April 2005. The results indicated that application of polymeric chitosan by seed soaking before planting followed by four foliar sprayings throughout cropping season significantly increased (P<0.05) the tiller numbers per plant and dry matter accumulation but decreased unfilled grains. However, the application of chitosan with different molecular weights and different application methods did not affect plant height, thousand-grain weight and filled grains. Focusing on the rice yield, there was a tendency to achieve higher yield when polymeric chitosan was applied by seed soaking before planting followed by foliar spraying but it did not show any significant difference from the other treatments. |
หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Drought Recovery and Grain Yield Potential
of Rice after Chitosan Application) ผู้เขียน:Suchada Boonlertnirun, ดร.เอ็จ สโรบล, ศาสตราจารย์, Sawit Meechoui, นางอิสรา สุขสถาน, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractChitosan is a biopolymer applied to plants in order to increase the key enzymes related to the closure of the plant’s stomata resulting in reduction of water loss. The aim of this experiment was to determine the effect of chitosan on drought recovery and grain yield of rice under drought conditions. The experimental design was arranged in RCBD with four replications of five treatments: sufficient irrigation, drought without chitosan, chitosan applied before drought, chitosan applied during drought and chitosan applied after drought. The experiment was conducted in a greenhouse at the Department of Plant Production Technology, Rajamangala University of Technology Suvarnabhumi, during April to August 2005.The results revealed that the treatment applied with chitosan before drought gave the highest yield and yield components and also showed good recovery. Furthermore, the percentage of damaged leaves was less than those of the other treatments. From this study, it is suggested that the severity of rice plants damaged from drought was reduced by chitosan application. |
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