Khunnalaksana khong Metal-Humus complexes nai din chan A khong thai lae korean doi kan sakat duai phairophotphate lae calcium thi laek plian dai lae khabon.
1988
Prasop Wirakonpanit | Nilprapai Chuntanaparp | Somphit Mairiang
Clay-humus interaction has a primary importance in the determination of humus content in red-yellow coloured soils in the tropical and temperate regions and the main role of clay is to supply A1 and Fe to form that complex and stabilize humus against microbial degradation. In sandy Thai and Korean soils with a clay content less than 15 %, the amounts of pyrophosphate extractable A1 (A1pyr) and Fe (Fepyr) and low and give a narrow atomic ratio of (Al+Fe)pry/Cpyr. In most light and heavy clayed Thai and Korean soils with clay content more than 15 %, the contribution of Al and Fe to humus accumulation gives a wider ratio of (Al + Fe)pyr/Cpyr. On the basis of the Alpyr/Cpyr and Fepyr/Cpyr ratios, Al in humus complexes was inferred to occur as Al(OH)2+ for more than half of Thai soils and for one third of Korean soils and as Al(OH)2+or both Al(OH)2+ and Al(OH)2+ in few Thai and Korean soils as well as Fe was as Fe(OH)2+ in most Thai and Korean soils. In three Thai Ultisols and two Korean Alfisols, half or more than half of humus was inferred to complex with Ca.
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