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Articles by S. Kaewsit
Total Records ( 5 ) for S. Kaewsit
  B. Chutichudet , P. Chutichudet and S. Kaewsit
  An analyzing study to evaluate the relationship between Polyphenol Oxidase (PPO) activity, internal qualities and degree of browning was conducted on lettuce var. Grand Rapids in order to understand the basis changes relating to the appearance of leaf browning and some quality characteristics. For PPO activity, Factorial experiment in completely randomized design was arranged with two factors: developmental stage (Factor A) at four levels (28, 42, 59 and 73 days after planting, DAP) with three different parts of plant (Factor B) (stem, leaf and root), while Completely Randomized Design (CRD) was applied for studying the internal qualities and browning appearance in leaves at 28, 42, 59 and 73 DAP. The experiment was carried out during May-July, 2009, with four replications, ten plants per replication. The results showed that each developmental stage and the various sections of the plant affected PPO activity. The leaf section of the plant particularly affected PPO, especially at 73 DAP. In addition, at the more mature stages of the leaf, more phenolic substance, ascorbic acid content and pH value were apparent, while quinone content decreased at advancing leaf age. In addition, as the plants reached an older stage, the leaf colour in terms of L* and b* decreased. Thus, the appropriate harvest for lettuce var. Grand Rapids should be at 59 DAP in order to face fewer incidence of browning and maintain good quality.
  Benjawan Chutichude , P. Chutichudet and S. Kaewsit
  The purpose of this experiment was to investigate the effect of preharvest soil application of dolomite on the growth, activity of Polyphenol oxidase (PPO) and internal characteristics was evaluated on lettuce cv. Grand Rapids under field conditions. A factorial in completely randomized design was arranged with four replications and composed of two factors; application time four levels (25, 40, 55 days after planting, DAP compared with untreated treatment, Control) with four concentration rates (0, 50, 100 and 150 ppm). The results show that dolomite application irrespective of application times or concentration rates had no effect on stem diameter, plant height, degree of leaf browning, fresh weight, biomass, chlorophyll content, leaf colour in terms of a* and b*, the content of phenolic, quinone, Total Soluble Solids (TSS), Titratable Acidity (TA), pH or ascorbic acid content. While maximum response of leaf increment was achieved with treating of 150 ppm dolomite at 25 DAP. Dolomite application irrespective of concentrations at all application times (25, 40 and 55 DAP) reduced the bush size compared with the control. In addition, application of 150 ppm dolomite at 55 DAP had the maximal brightness of leaf colour, L* value. Furthermore, dolomite treatment of 50 ppm at 25 DAP gave the least level of PPO activity at 33 DAP.
  P. Chutichudet , Benjawan Chutichudet and S. Kaewsit
  This laboratory experiment was carried out at the Department of Agricultural Technology, Mahasarakham University, Northeast Thailand during June to October 2007. The experiment aimed to search for the most appropriate harvesting age of fruits of Santol orchard plants with respect to colour, tissue texture, total soluble solid content, titratable acidity and pH of Santol fruits. A Randomised Complete Block Design (RCBD) with four replications was used. Each replication consisted of 10 fruits, thus a total of 160 fruits were used. The Santol fruits were harvested at different ages, i.e., 100, 115, 130 and 145 days after full bloom of flowers and these harvested ages were used as treatments, i.e., 100 for T1 (Control), 115 for T2, 130 for T3 and 145 for T4. The results showed that the most appropriate harvesting date for high quality Santol fruits was found with T4, i.e., 145 days after full bloom of flowers where Santol fruits of T4 gave the highest mean values of fruit length, diameter, fresh weight fruit-1 of 10.71 cm, 9.31 cm and 399.76 g, respectively. Yellowness of skin colour of fruits was evenly distributed. Total soluble solid content of pericarp, flesh tissue and seeds were highest for T4 with mean values of 13.93, 15.05 and 18.260 brix, respectively. Flesh texture density highly decreased with an increase in numbers of days after full bloom of flowers. Titratable acidity content in fruits was highly decreased with an increase in numbers of days after full bloom of flowers whereas a reverse was found with pH of fruit juices.
  Chutichudet Benjawan , P. Chutichudet and S. Kaewsit
  Abstract: This green manure experiment with the use of okra crop as indicator plant was carried out at Mahasarakham University Experimental Farm, Mahasarakham province, Northeast Thailand during May to September 2005 to investigate four types of green manure legume crops on growth, yield and quality of edible fresh pods of okra crop when grown on Roi-Et soil series (Oxic Paleustults). The four types of green manure plants include Jack bean, Cowpea, Green gram, and Giant sensitive plant. The experiment consisted of five treatments, i.e., T1 (Control), T2 (Jack bean), T3 (Cowpea), T4 (Green gram) and T5 (Giant sensitive plant). The experiment was laid in a Completely Randomized Design (CRD) with four replications. The results showed that Roi-Et soil series (Oxic Paleustults) contained some considerable mean values of organic matter (1.64-1.66%) but soil available phosphorus and exchangeable potassium were relatively low, particularly potassium. Green manures of the four legume plants slightly improved soil property of the Roi-Et soil series (tested at the end of the experimental period). The most effective green manure on stem diameter, bushy diameter, leaf numbers plant- 1 and leaf area of the fifth leaf of the okra plants, in most cases, was found with Jack bean and Cowpea ranked the second. However, in most cases, Cowpea gave a similar effect as that of Green gram and Giant sensitive plant. Pod length and weight pod- 1, pod diameter and edible fresh pod yields (5,941.86 kg ha- 1) were highest with Jack bean green manure treatment (T2), whilst the rest, in most cases, were similar. Green manure treatments gave highly significant effect on total soluble solids of pods over the control treatment, whilst total acidity, fibre and pectin contents were unaffected by green manure treatments. Green manure of Jack bean was the best legume crop for green manure to be used in improving soil fertility, particularly for Roi-Et soil series (Oxic Paleustults).
  Prasit Chutichudet , B. Chutichudet and S. Kaewsit
  A comprehensive study to evaluate calcium, in terms of gypsum (CaSO4.2H2O) by soil dressing application, on enzymatic browning activity of Polyphenol oxidase (PPO) and internal qualities was tested on lettuce var. Grand Rapids under field conditions. A factorial in completely randomized design was arranged with four replications. The results showed that plants-treated with 50 mg kg-1 gypsum applied at 40 DAP had the maximal fresh weight of 25.83 g plant-1. The internal qualities of the lettuce at harvest showed that plants treated with 50 mg kg-1 gypsum had the maximal chlorophyll content (26.80 mg m-2), while all gypsum concentrations applied in this study, had less content of ascorbic acid than the control plants. Plants-treated with 100 mg kg-1 gypsum affected to the lowest level of PPO activity at week 3 after transplanting. Furthermore, gypsum application had no effect to biomass, leaf colour, the contents of phenolic and quinone in lettuce at harvesting stage.
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