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Articles by A. Polthanee
Total Records ( 8 ) for A. Polthanee
  W. Wattanapayapkul , A. Polthanee , B. Siri , N. Na Bhadalung and A. Promkhambut
  Infestation of rice by the leaf blast disease caused by Pyricularia oryzae is frequent and results in severe yield losses and high production costs. Silicon has been reported to have potential for controlling the blast disease in rice. The objectives of this study were to determine the effects of silicon in suppressing the blast disease and increasing the grain yield of organic rice in northeast Thailand. Field experiments were conducted in farmers’ fields in two locations in Northeast Thailand, Buriram (experiment 1) and Surin (experiment 2) provinces. Both experiments used a randomized complete block design with four replications. Treatments consisted of four silicon application rates of 0, 250, 500 and 1,000 kg ha-1. Results showed that silicon applied to rice suppressed occurrence of the blast disease. Values of a severity index of leaf blast and neck blast were significantly decreased when silicon was applied at the rate of 250 to 1,000 kg ha-1 in comparison with the control treatment without silicon in both locations. At the highest silicon application rate, 1000 kg ha-1, leaf and neck blast severity were reduced by 83 and 75% in experiment 1 and 81 and 77% in experiment 2, respectively. Grain yield when silicon was applied was 19-43% higher than the control in experiment 1 and 2-14% higher than the control in experiment 2. The maximum grain yield was obtained at the rate of 1,000 kg ha-1 in both locations (4,538 and 4,070 kg ha-1 in experiments 1 and 2, respectively). The yield obtained when silicon was applied at the rate of 1000 kg ha-1 was not significantly different from that obtained at the rate of 500 kg ha-1 in experiment 1, but it was significantly higher in experiment 2.
  A. Polthanee and T. Changdee
  A greenhouse experiment was conducted in Department of Plant Science and Agricultural Resources, Faculty of Agriculture, Khon Kaen University in 2005. The objective of this study were to investigate the effects of adventitious root removing and timing of fertilizer application on growth, yield and nutrient uptake of kenaf (Hibiscus cannabinus L.). The results showed that removing adventitious roots from the plant significantly reduce in growth, yield and nutrient uptake of kenaf in comparison with no adventitious root removing. Splitting chemical fertilizer application as basal at planting, combined with top dressing at 60 days after planting during adventitious root forming in flooded soil did not show any significant difference in fiber yield in comparison with once application as basal at planting. A field experiment was conducted in Ban Muong village, Muang district in Khon Kaen province in 2005-2006. The objective of this study was to investigate the effects of timing of fertilizer application on growth, yield and nutrient uptake of kenaf (Hibiscus cannabinus L.). The results showed that splitting chemical fertilizer application as basal at planting, combined with top dressing at 60 days after planting significant increase in fiber yield as compared to once basal application at planting or once top dressing at 60 days after planting. The new finding indicate that the response of adaptive adventitious roots (water roots) of economic kenaf crops to flooding stress mainly affects nutrient uptake, similar to the aquatic roots of wetland plants.
  A. Polthanee , T. Changdee , J. Abe and S. Morita
  A pot experiment was performed to examine the effects of flooding on growth, yield and aerenchyma development in adventitious roots of four kenaf (Hibiscus cannabinus L.) cultivars. Three flooding treatments consisting of early season flooding (30 days after planting), mid-season flooding (60 days after planting) and late season flooding (90 days after planting), as well as non-flooding control were used in the present study. The results show that soil flooding significantly increased plant height by 108 and 107% over control in early flooding and mid-flooding, respectively. Early flooding significant decreased the number of leaves and leaf area of whole plant and core dry weights by 15, 19 and 20% over non-flooding control, respectively. Soil flooding did not show any significant effect on plant height and number of leaf among cultivars, but did for leaf area, leaf dry weight and core dry weight. Early season and mid-season flooding significant decreased root dry weight in soil by 71 and 49% over non-flooded control, respectively. No adventitious roots developed in non-flooded control. Adventitious roots located in water above soil surface had dry weight of 18, 11 and 6 g plant-1 in early season, mid season and late season flooding, respectively. No significant difference in root dry weight located in soil and root dry weight located in water above soil surface were observed among cultivars. Aerenchyma formed in adventitious roots when the plant was subjected to flooding and was more developed in roots located in water above the soil surface as compared to roots located in soil. All the cultivars formed aerenchyma in their adventitious roots with variation among cultivars. Soil flooding significantly decreased fiber yield by 13% in non-flooded control in early season flooding treatments. However, mid-season and late season flooding did not show any significant difference on fiber yield in comparison with control. The cultivars was not significantly difference on fiber yield in the present experiment.
  T. Changdee , A. Polthanee , C. Akkasaeng and S. Morita
  The objective of this study was to investigate the effect of different waterlogging regimes on growth, yield and roots development in three fiber crops. Three fiber crops kenaf (Hibiscus cannabinus L.), roselle (Hibiscus sabdariffa L.) and jute (Corchorus olitorius L.) were subjected to waterlogging for 45, 60, 75, 90 and 105 days, as well as a well-drained subject (control). The waterlogging regimes had a significant effect on plant height, stem diameter, leaf area, biomass production, root growth and aerenchyma tissue formation. The crops subjected to waterlogging for longer periods were more affected in their growth characteristics: H. cannabinus had a higher plant height, stem diameter, leaf area, biomass production and root growth less than H. sabdariffa and C. olitorius. Aerenchyma tissue developed in adventitious roots of three fiber crops species. The fiber crops subjected to waterlogging regimes decreased fiber yield by 11.9-51.2% compared to the control. H. cannabinus produced the highest fiber yield after 45 days of waterlogging duration. This results is due to the higher growth and roots development of H. cannabinus than the other two fiber crops.
  A. Promkhambut , A. Younger , A. Polthanee and C. Akkasaeng
  The aim of this study was to investigate the effect of waterlogging on morphological and physiological traits of sorghum (Sorghum bicolor L. Moench) cultivars. Four sorghum cultivars, cv. Wray, Keller, Bailey (sweet cultivar) and cv. SP1 (forage cultivar) at five expanded leaf stage were subjected to 20 days of waterlogging and drained pots were kept as the control. Twenty days of waterlogging did not cause a significant difference in shoot and root biomass among cultivars. Flooding reduced leaf area (69%), plant height (30%) and youngest leaf expansion rate of all cultivars but severely reduced in SP1 (35-80%). Flooding promoted leaf senescence of all cultivars and biomass allocation to shoot (increase in shoot/root) in Wray, Keller and Bailey, but increased biomass partitioning to root in SP1. The initiation of new nodal root was noted in SP1, whereas the ability to maintain root surface area by increase in longest root length and nodal root development near soil surface was found in Wray. Photosynthetic rate, stomatal conductance and transpiration rate were severely reduced under waterlogging conditions of sweet cultivars (65-78%), but enhanced over the control in forage cultivar (56%). The ability to conserve root surface area, allocate more biomass to shoot during waterlogging and develop root near soil surface may support new growth in Wray, whereas the ability to maintain leaf gas exchange parameters in SP1 was due to the active nodal root growth. Nevertheless, there was no relationship between photosynthetic rate and shoot growth of sorghum under anaerobic conditions.
  A. Naing Oo , P. Banterng , A. Polthanee and V. Trelo-Ges
  The aim of this study was to investigate the effect of organic and inorganic fertilizers on growth and yield of five upland black glutinous rice varieties and soil property. Two experiments were conducted at Khon Kaen University, Thailand during the rainy seasons of 2007 and 2008. Experiments were laid out in a split-plot design with four replications. Four fertilizer treatments (control, farmyard manure (FYM) or cattle manure at a rate of 10 t ha-1, NPK at the rate of 50-22-42 kg N-P-K ha-1, the combination of the FYM and NPK were randomized in the main plots and five black glutinous rice varieties (KKU-GL-BL-05-002, KKU-GL-BL-05-003, KKU-GL-BL-05-004, KKU-GL-BL-05-009 and KKU-GL-BL-05-010) were randomized in the sub plots. Soil samples before fertilizer application and after harvesting were analyzed to determine chemical and physical properties. Leaf Area Index (LAI) and shoot dry matter were recorded at 40 days after planting, panicle initiation and flowering stages. Number of tillers and panicles per hill and grains per panicle, thousand grain weight, number of filled and unfilled grains and grain yield were recorded at harvest time. The results from both years indicated that using the combination of FYM and inorganic fertilizers increased shoot dry matter, LAI, tiller and panicle number per hill, grain number per panicle and grain yield. It was recorded that application of FYM together with inorganic fertilizers significantly increased soil organic matter, CEC, N, P and K. Comparing among the five varieties, KKU-GL-BL-05-002 had highest grain number per panicle and grain yield in both years.
  S. Sanusan , A. Polthanee , A. Audebert , S. Seripong and J.C. Mouret
  This study investigates the effects of different seeding depths and water stress on growth and yield of direct-seeded rice. The experiment was a 3x2x2 factorial in a randomized complete block design with four replications. The main factors (03) were seeding depths (0, 1 and 5 cm), water level (well watered and water stress at 30 days after seeding (DAS) and rice cultivars (Pathum Thani 1 and Suphan Buri 1). Above-ground biomass and root length density were significantly affected by rice cultivars, seeding depths and water stress. The Suphan Buri 1 had a higher above ground biomass and root length density than the Pathum Thani 1. At the first 7 days of water stress, maximum above-ground biomass was obtained at 1 cm seeding depth. But at a later stage, the highest above ground biomass was observed with a seeding depth of 5 cm at both 60 and 90 days after seeding. The greatest root length density was obtained at a seeding depth of 5 cm. Grain yield was significantly affected by seeding depths and water stress. The highest grain yield was obtained in 5 cm seeding depths compared with other low depth under water stress at vegetative stage (30 DAS). It was concluded that yield loss under water stress at vegetative stage may be compensated for by increasing seeding depth above shallow depth levels.
  A. Polthanee , C. Janthajam and A. Promkhambut
  The objectives of this study were to investigate growth, yield, starch content and economic return of cassava cultivars grown following rice. Five cassava cultivars including Rayong-7, Rayong-11, Rayong-72, Kasetsart-50 and Huaybong-80 were tested in randomized complete block design with 4 replications. The results showed that at 6 months after growing. Rayong-11 gave the highest of leaf area index as well as leaves and stems dry weight. Rayong-7 produced the maximum fresh tuber roots yield, while Rayong-72 gave the highest dry roots yield. The starch content was not significantly affected by cassava cultivars. Kasetsart-50 tended to give the highest starch content. Cassava grown following rice as a bonus crop provided net income over materials cost 1,163-1,810 US dollars ha-1, depending on the cultivar.
 
 
 
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