Soil moisture variation of paddy field in dry season, Sukhothai province | ความผันแปรความชื้นในดินนาข้าวในช่วงแล้งฝน จังหวัดสุโขทัย
2008
Somnimitr Pukngam(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Forestry. Department of Conservation) E-mail:[email protected] | Suda Saikrajang(Kasetsart University. Bangkhen Campus, Bangkok (Thailand). Faculty of Forestry. Department of Conservation. Major Field of Watershed and Environmental Management)
Variation of soil moisture content (SMC) under paddy field using TDR (Time Domain Reflectometry) was carried out during dry season in November 2005 to June 2006. The objectives were to study the variation and rate of decreasing of daily and monthly soil moisture content. The data was measured every minute at 4 levels as 0-5, 5-10, 10-15 and 15-20 cm. depth in soil respectively. The results found that the rate of decreasing of daily SMC in each level were 0.36, 0.19, 0.15 and 0.15 percent by volume respectively. The monthly SMC in case of no rain (November 2005 to middle of February 2006) were 21.09, 22.47, 26.21 and 27.04 percent by volume respectively. In case of rainfall (Middle of February 2006 to June 2006), the monthly SMC were 21.21, 21.51, 24.52 and 24.37 percent by volume respectively.
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