Rubber planting soil in the South of
Thailand has been developed under humid
tropical climate, so it is generally low fertility.
Kaolinite, which low capacity of nutrient
adsorption, is the dominant clay mineral.
Analysis o'f 27 soil series samples found that
it coniained plant nutrient element in the range
of low to medium. pH 4.1-4.7, total nitrogen
0.4-2.5 mg kg-', available phosphorus 4-25
mg kg-', exchangeable potassium 0.04-0.23
cmol kg-l exchangeable magnesium 0.'t 5-1.37
c"
cmol kg-l and cation exchange capacity c"
(CEC) 3-18 cmol kg-l. Chemical properties
of soil under rubber plantation bot[ in the
old area (South of Thailand) and in the new
area (North-east and North of Thailand),
including the appropriate range, were also
shown in Tablel.
Rubber planting soil in the South ofThailand has been developed under humidtropical climate, so it is generally low fertility.Kaolinite, which low capacity of nutrientadsorption, is the dominant clay mineral.Analysis o'f 27 soil series samples found thatit coniained plant nutrient element in the rangeof low to medium. pH 4.1-4.7, total nitrogen0.4-2.5 mg kg-', available phosphorus 4-25mg kg-', exchangeable potassium 0.04-0.23cmol kg-l exchangeable magnesium 0.'t 5-1.37c"cmol kg-l and cation exchange capacity c"(CEC) 3-18 cmol kg-l. Chemical propertiesof soil under rubber plantation bot[ in theold area (South of Thailand) and in the newarea (North-east and North of Thailand),including the appropriate range, were alsoshown in Tablel.
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