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Articles by Chalermchai Wongwattana
Total Records ( 2 ) for Chalermchai Wongwattana
  Boonrod Chatiyanon , Tawatchai Tanee , Chusri Talubmook and Chalermchai Wongwattana
  Dry leaf of Hyptis suaveolens Poit was extracted with water and methanol and the effect on seed germination and seedling growth were determined in Pennisetum setosum and Mimosa invisa. The water extract significantly reduced P. setosum seed germination and strongly inhibited shoot and root lengths of both P. setosum and M. invisa. The inhibition percentages increased with the increasing of dry leaf ratios of the extracts. Shoot growth of P. setosum and M. invisa seedling was less sensitive to the extract than root growth was. The lower leaf ratios extracts (1:80 and 1:40) did not reduce shoot length of both weeds, in contrast, the 1:80 ratio extract promoted P. setosum shoot length 16.97% of untreated control. In this study, P. setosum was more susceptible to H. sauveolens leaf water extract than M. invisa. The methanol extraxts of H. suaveolens leaf significantly inhibited seed germination and seedling growth of both P. setosum and M. invisa and the inhibitory effects were higher than those of the water extracts. This might indicate solubility of the allelochemicals in H. suaveolens leaf better in methanol than in water. It is interesting to study further on allelopathy of this plant for the practical use in agricultural pest management.
  Boonrod Chatiyanon , Tawatchai Tanee , Chusri Talubmook and Chalermchai Wongwattana
  This research aimed to develop and investigate the effectiveness of three hands-on practical on weed control using plant extracts for undergraduates, compare gains of students science process skills between before and after learning with the practical and investigate students preferences towards learning with the practical. The subjects, sampled by using the purposive method were 30 undergraduates from the Department of Biology, Srinakharinwirot University. The research tools consisted of three hands on practicals of the use plant extracts to control the weeds for undergraduates, a 40 multiple choice questions of science process skills with 4 options and a thirty items of 5-rating Likert preferences towards learning with the practicals. The data were analyzed by the descriptive statistics and t-test for independent samples. The findings indicated students science process skills after learning with the practical had significantly higher than those before learning with the practical (p>0.05). Students preferences towards learning with the hands on practical were at the high level of 4.21±0.34. Therefore, this hands on practicals can assist students to understand the plant sciences, particularly the plant extract use for weed control.
 
 
 
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