Natural compost or organic fertilizers suitably applied to soil since it improves soil quality is cheap and easy to manage and has no pollution residues. However the right ratio of ingredienttypes as well as enough fermentation period have to be tested in order to obtain suitable fertilizer for each particular plant species. In this study researchers have conducted experimental fermentation of organic composts composed of various ratios of either residues of bagasse or banana pulp mixed with sludge. This organic compost performs as organic fertilizer adding nutrients to the sludge since the sewage sludge by itself can only help improve soil structure but has insufficient nutrients for the growth of plants. The sludge in the experiment was obtained from sewage sludge at WatSuanKaew Nonthaburi province. The results of the organic compost after fermented 49 days showed that the compost turned to brown and black and most plant materials were already macerated. The compost of sewage sludge mixed with banana pulp in the ratio of both 0.75 to 5.0 and 1.0 9 to 5.0 yielded the best growth of the morning glory. Both formulas accelerated the growth of seedlings of the plant to a high average of 15.0 ± 0.3 cm after grown for14 days. The concentration of main nutrients was also close to the values specified by the standard compost. This banana pulp compost with pH 7-9 helpedreduce the acidity in the soil. While organic fertilizer derived from sewage sludge mixed with bagasse could only help accelerate the growth of the seedlings but did not accelerate the proliferation of immature plants. Additionally the ratios of carbon to nitrogen in all bagasse composting samples were more inflated whereas the nitrogen phosphorus and potassium were under the specified standard. This bagasse caused lower pH to 5.0-6.0 contributing more acidic to soil. From all results of these findings the organic compost from the fermentation of banana leafs was therefore appropriated for improving soil quality by mixing with sludge. The organic compost provided enough major and minor nutrients that stimulated the plant growth as well. However the formulated ratio of the bananas leafs and sludge mixtures needed to be prior experimentally tested.

This thesis presents the Power Quality (PQ) analysis of solar power plant 1MW and economic impacts in the distribution power networks. The case study focuses on the penalty fee (fine) from consume the reactive power less than the limit of the Provincial Electricity Authority (PEA) of Thailand. The fine have been charged up to 900000 baht per year. Therefore the thesis studies and purposes the possible solution by analysing the operating function of the inverter (supports reactive mode) installing the adjustable capacitor bank 1500kVar in the Medium Voltage (MV) level and lastly installing the adjustable capacitor bank 1500kVar in the Low Voltage (LV) level. The results shown that the possible solution that reduces the fine is installed the adjustable capacitor bank 1500kVar in the MV. The investment of this installation is cost 1800000 baht with the nominal operation over 10 years. The analysis of financial investment which bases on the Net Present Value (NPV) the Benefit-Cost ratio (B/C) the Pay Back period (PB) is presented the NPV at 4902971 baht B/C 3.72 and PB 2 year (with the Internal Rate of Return; IRR 49.7 percent).

The objective of this research was to explore factors affecting the selection of property plant and equipment revaluation influencing discretionary accruals of listed companies in real estate and construction sector in Stock Exchange of Thailand during the period of 2011 - 2013. Data were collected from 294 samples and analyzed by logistic regression analysis and t-test in order to test the hypothesis. The results revealed that debt and property investment ratios affected the selection of revaluation accounting policies. Furthermore the research revealed that sample firms selecting property plant and equipment revaluation had significantly higher discretionary accruals than those firms who applied cost method at 0.05 significant level of statistics.

The effects of plant growth regulators alone or in combination on Hexachlorocyclohexane (HCH) phytotoxicity were studied. Waxy corn seeds were immersed in different plant growth regulators that are 1) 2 mg/l Indolebutyric acid (IBA) 2) 2 mg/l Thidiazuron (TDZ) 3) 2 mg/l Gibberellic acid (GA3) 4) 1 mg/l IBA + 1 mg/l TDZ 5) 1 mg/l TDZ + 1 mg/l GA3 and 6) 1 mg/l IBA + 1 mg/l GA3 then sawn in 30 mg/kg HCH-contaminated soil or non-contaminated soil for 10 days. All plant growth regulators could enhance shoot and root dried weight of waxy corn seedlings in non-contaminated soil. Only 2 mg/l GA3 could enhance root length of waxy corn seedlings in non-contaminated soil. In HCH-contaminated soil only 2 mg/l TDZ could increase shoot dried weight of waxy corn seedlings. Also 2 mg/l IBA or 1 mg/l IBA and1 mg/l GA3 could increase root fresh weight of waxy corn seedlings. The exposure with HCH in soil did not affect to shoot and root tissue even though the growth of shoot and root were inhibited. However the exposure with HCH and receive exogenous plant growth regulator induced aerenchyma formation in cortex and pith of waxy corn root.

Recent explorations of Podostemaceae have discovered 2 new species to science (Dalzellia TWA-216 และ Hydrobryum TWA-198) from Phitsanulok Province and 3 more genera and six more species from previously known (2 genera and 4 species). Totally five genera and 10 species occur in Phitsanulok and Phetchabun provinces. Based on morphological and molecular evidence the taxa are classified into subfamily Tristichoideae including 2 genera and 3 species (Dalzellia 2 spp. and Terniopsis 1 sp.) and subfamily Podostemoideae consisting 3 genera and 7 species (Hanseniella 1 sp. Hydrobryum 5 spp. and Thawatchaia 1 sp.). The species found in both provinces are Hy. phetchabunense and Hy. tardhuangense while D. kailarsenii is found only in Phetchabun. The plants discovered only in Phitsanulok include Dalzellia TWA-216 Hydrobryum TWA-198 Han. heterophylla Hy. bifoliatum Hy. kaengsophense Th. trilobata and T. minor. Among the species found Hy. tardhuangense and Th. trilobata are also distributed to the Lao PDR and the rests are endemic to Thailand.