Studies on saline soils in khon kaen region, northeast thailand I. Physical and chemical properties of saline soils

Abstract

Saline soils occur extensively in Northeast Thailand. As the climate of this region is clearly differentiated into dry and rainy seasons, salts in the groundwater move up and accumulate on the soil surface during the dry season and are leached down with rainfall during the rainy season. In this paper, the physical and chemical properties concerned with salt movement were investigated for the saline soils in the Khon Kaen Region, Northeast Thailand. Changes in the physical and chemical properties with leaching were also studied in order to determine the effect of rainfall on desaltation. The saline soils in the Khon Kaen Region are generally sandy with low CEC, low content of organic matter and low buffering capacity. The dominant salt is NaCl, which facilitates the dispersion of clay. The main types of clay minerals are I : I type. All the soils contained large amounts of quartz, indicating that they are highly weathered soils. The amount of materials dispersed by water leaching, mainly clay, accounted for the large percentage of clay and silt fractions.

Relationship between Soil Salinity and Physico-chemical Properties of Paddy Field Soils of Jhilwanja Union, Cox’s Bazar, Bangladesh

“…Islam et al (2014) found most soils had very low amounts of total N. Like other tropical and subtropical soils, Bangladesh soils have long been categorized as poor in soil fertility because of low N supplying capacity (Islam, 1983). Patcharapreecha et al (1989) investigated saline soils contains total nitrogen (0.005-0.043%) contents were very low in all the soils. Several studies have shown that salinity reduces N uptake (Al-Rawahy, Stroehlein, & Pessarakli, 1992) by crops and do not support plant growth due to a higher osmotic pressure in the plant soil system Bhumbla (1977) despite adequate nutrient levels being available in the soil.…”

“…Uddin and Islam (1998) investigated the Coastal soils of Bangladesh and most soil Organic matter (%) ranges < 2 to > 20. Patcharapreecha et al (1989) investigated saline soils that contain 0.07-0.74% soil OM. Haque (2006) found the pretty low (1.0-1.5%) soil OM content in coastal saline soils.…”

Studies on saline soils in Khon Kaen Region, Northeast Thailand

“…Patcharapreecha et al (1989) reported that washing with a small amount of water decreased the EC values of these soils drastically.…”

“…The sampling sites were KK2 and KK4, which had been studied in detail by Patcharapreecha et al (1989). Japanese paddy soil collected from Anjo Agricultural Experiment Station was used for comparison.…”

Effects of Straw Mulching on Soil Physicochemical Properties in Saemangeum Reclaimed Land

“…mg kg -1 (Carter and Fanning, Lee et al, 2000;1963;Kim et al, 1988;Jo et al, 1993;Koo et al, 1992;Patcharapreecha et al, 1990;Ryu et al, 2014;Tejedor et al, 2003;Sadegh-Zadeh et al, 2009;Sohn et al, 2010;Son et al,, 1994). 춘다는 다수의 연구결과와 일치하였다 (Fanning and Carter, 1962;Carter and Fanning, 1963;Kim et al, 1988;Kim et al, 1990;Patcharapreecha et al, 1990;Tejedor et al, 2003;Zhang et al, 2008;Sadegh-Zadeh et al, 2009).…”