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Articles by Chutichudet Benjawan
Total Records ( 6 ) for Chutichudet Benjawan
  Chutichudet Benjawan , P. t Chutichude and S. Khumkratok
  This investigation was carried out to justify the relationship between harvesting ages of santol fruit, browning reaction and other concerning data. Growers of santol plantations in Thailand have always accustomed to problems on inconsistency in qualities of santol fruits var. Pui Fai due to inappropriate harvesting index. Thus these encourage to decrease marketable qualities of fruits and short shelf-life particularly browning discoloration. In order to investigate adequate information for growers of the santol orchard plants, it is important to carry out experiments on Polyphenol Oxidase (PPO) activity and changes of tissue structure by separating fruit into three parts: peel, flesh and seed of santol fruit var. Pui Fai harvested at four stages: 100, 115, 130 and 145 Days After Full bloom (DAF). A factorial in randomized complete block design with five replications was used. In each replication ten fruits were used. This investigation was carried out during the period of October 2006 to March 2007 at The Department of Agricultural Technology, Mahasarakham University, Northeast Thailand. The results showed that PPO activity which related to browning reaction changed with harvesting stage. The highest PPO activities were obtained and highly significant increased in mature fruit at 130 and 145 DAF. When the fruits were ripening at 145 DAF, PPO activities from peel, flesh and seed had no significant differences and high levels by 160.76-184.44, 158.88-180.76 and 154.52-181.08 U mg-1 fresh weight, respectively. While cross-section study in peel and flesh of santol fruit var. Pui Fai at different ages indicated that immature fruits (100 and 115 DAF) showed small cells arranged one to two layers in epidermis. Trichome like-hair also appeared on this layer. When santol fruits grew through 145 DAF, epidermis converted to periderm and trichome disappeared. In addition, parenchyma cells in flesh accumulated several substances in form of druse with the fruit age increment. These high PPO activities and fruit tissue conversions of peel and flesh in mature fruit may led to be more sensitive to browning reaction.
  Chutichudet Benjawan , P. Chutichudet and T. Chanaboon
  This investigation was carried out at Mahasarakham University Experimental Farm, Mahasarakham University, Northeast Thailand in the late rainy season of the 2003 to 2004 with the use of Roi-Et soil series (Oxic Paleustults). The experiment aims to search for more information on the effect of different rates of chemical Paclobutrazol (PBZ) application on growth, yield and quality of edible okra pods. A Randomised Complete Block Design (RCDB) with four replications was used for the experiment. The experiments consisted of five treatments, i.e., 0 (T1), 4,000 (T2), 8,000 (T3), 12,000 (T4) and 16,000 ppm ha-1 (T5) of chemical PBZ. The results showed that an increase in PBZ application rate highly decreased plant height, harvesting age and significantly decreased leaf area of the fifth leaf but highly increased pod length, fresh weight/pod and fresh pod yield ha-1 of the okra plants. PBZ had no significant effect on stem diameter and diameter of pods of the okra plants. Total soluble solid, fibre content, titratable acid, vitamin C and pectin contents in pods were not affected by chemical PBZ application. Pod yield highly increased with an increase in rate of PBZ application. The highest edible pod yield reached a value of 4,501 kg ha-1 for the highest rate of PBZ application (T5).
  Chutichudet Benjawan , P. Chutichudet and S. Kaewsit
  This experiment was carried out at the Faculty of Technology, Mahasarakham University, Mahasarakham 4400, Thailand to investigate effects of different water-soaking durations and hot air oven treatments on the germination of seeds of Kwao Kreu Kao (Pueraria candollei Grah. ex Benth) plants. The experiment was laid in a Randomised Complete Block Design with four replications. The results showed that after tested for Electrical Conductivity (EC) values for cracking of seeds, all seeds being used were at a normal condition (with an average EC value of 28.56 µS cmG-1g G-1) and all seeds were ready for germination. Strength on impermeability of seeds declined after soaking in water for 10 h and onwards then the treated seeds had increased in weights. However, after treated under hot air oven, dry weights of all seeds became similar. Germination percentage of all treatments was most rapid during the first three weeks of germination period and later slowly increased with time. At day 91 after sowing, T2 gave the highest percentage of germination (52%) and the lowest was found with T1 (control) with 31.25%. Again at day 91 after sowing, T2 gave the highest mean value of plant numbers (16.38) and the lowest was found with T1 (7.28). Numbers of abnormal seedlings determined at day 63 after sowing were lowest with T2 (6.25%) and worst with T4 (20.14%). Again at day 63 after sowing, plant height was significantly tallest with T2 (3.88 cm) and the lowest was found with T4 (2.71 cm). Numbers of leaves were not significantly different among the treated plants reaching a highest value of 11.25 leaves plantG-1 for T3. It may be concluded that T2 was the best treatment for use in germinating seeds of Pueraria candollei Grah. ex Benth plants. Further improvements on longevity and high percentage of germination of seeds were discussed and suggested.
  Chutichudet Benjawan and P. Chutichudet
  This laboratory experiment was carried out at the Department of Agricultural Technology, Mahasarakham University, Northeast Thailand during July and August 2008. The experiment aimed to determine an effective natural organic acid that would delay the unattractive skin browning of santol fruit, while at the same time not damaging the quality of the fruit. The experiment included a study of the fruit’s polyphenol oxidase (PPO) activity, phenolic content and quinone content, as they relate to colour and a study of total soluble solid content, pH, titratable acidity and vitamin C content as they relate to fruit quality. A Completely Randomized Design (CRD) with four replications was used. Each replication consisted of 10 fruits. Santol fruit was harvested at 145 days after full bloom and dipped for 30 min in aqueous solutions of two organic acids that were used as treatments, i.e., 0% for T1 (control), 5% citric acid for T2, 5% ascorbic acid for T3, 10% citric acid for T4 and 10% ascorbic acid for T5 and stored at room temperature (28°C, 90% R.H.) to investigate the effect of the acid on fruit weight, skin colour, PPO activity and other internal parameters. The results showed that the most appropriate anti-browning agent for santol fruit was found with T2. It gave the highest mean values, 57.37 and 55.95, of brightness (L*) at 4 and 10 Days After Storage (DAS), respectively. In addition, PPO activity of flesh tissue was lowest for T2 with mean values of 0.0078 to 0.0092 by 0 and 300 S, respectively. The phenolic content in the flesh tissue significantly increased with an increase in numbers of DAS, whereas the reverse was found with the pH level in the fruits. They were lowest for T2, with mean values of 6.00, by 10 DAS. There were no significant differences among the treatments in any of the measured Total Soluble Solids (TSS), Titratable Acidity (TA) and vitamin C content.
  Chutichudet Benjawan , P. Chutichudet and T. Chanaboon
  This investigation was carried out on Roi-Et soil series (Oxic Paleustults) at Chaiyaphum Province, Northeast Thailand during October 2004 to June 2005. The study aimed to justify the effect of different rates of Gibberellin (GA3) on yield and fruit quality of Kaew mango cv. Srisaket 007 (Mangifera indica L.). The study was laid in a Randomized Complete Block Design (RCBD) with four replications. Five rates of GA3 were used, i.e., 0 (T1, control), 1,953.25 (T2), 3,906.50 (T3), 5,859.75 (T4) and 7,813.00 ppm ha-1 (T5) with the actual rates being used of 0, 50, 100, 150 and 200 ppm for T1 up to T5, respectively, i.e., each rate was used for four replications of four mango trees of each treatment. The results showed that the application of GA3 at a rate of 1,953.25 ppm ha-1 or 12.50 ppm plant-1 appliedto Kaew mango cv. Srisaket 007 gave the highest mango fresh fruit yield of 32,066.83 kg ha-1. All rates of GA3 being used had no significant effect on harvesting age, width, flesh firmness and total soluble solids of mango fruits but highly increased % of panicles with survived fruits, fruit yield ha-1, fruit flesh content, fruit thickness, individual fruit weight and titratable acidity of flesh of fruits and also significantly increased in length of the mango fruits. GA3 at a rate of 1,953.25 ppm ha-1 or 12.50 ppm plant-1 is needed for high fruit production whenever mango trees started to produce flowers.
  Chutichudet Benjawan , P. Chutichudat , K. Boontiang and T. Chanaboon
  This investigation was carried out during a period of October 2004 to June 2005 at Chaiyaphum Province, Northeast Thailand to search for more information on the effect of chemical Paclobutrazol (PBZ) on flower and fruit development, quality and fruit yield of Kaew mango (Mangifera indica L.). A completely randomized design with four replications was used. Five rates of Paclobutrazol were used, i.e., 0, ,000; 3,000; 5,000 and 7,000 ppm/plant. The experiment consisted of two sets of treatments, i.e., T1 - T5 represent the first set and T6-T10 for the second set. The results showed that PBZ had no significant effect in extending number of days from flower initiation up to full bloom. PBZ also had no significant effect in delaying fruit maturity age but fruit sets were significantly increased with PBZ rates applied. PBZ had a highly significant effect on fruit length but significantly decreased fruit thickness. Fruit yields were significantly increased with PBZ application. The best application rate of PBZ was found with T7 (1,000 ppm/plant) with an extended flower raceme length of 5 cm. This treatment gave the highest mango edible fruit yield of 48,281.25 kg ha-1.
 
 
 
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