35. Group of Soil Series No.35

This group of soils is well drained, deep medium-textured ( sandy loam to sandy clay loam ) and occupies on uplands where precipitation is low. Fertility of these soils are relatively low. Soil reaction is very strong to strong acid. Soils in this group are Don Rai (Dr), Dan Sai (Ds), Hang Chat (Hc), Korat (Kt), Satuk (Suk), Warin (Wn) and Yasotorn (Yt) series.                Dry-land upland and tree crops are commonly found in the areas.

Problems : Low fertility, lack of water in dry season and soil erosion on steep slope, strong acid in some places.

Management for upland crops or vegetables : Upland crops or vegetables will grow better in leveling ground. Soils need to be improved with 2-3 ton/rai compose fertilizer or animal manure or mixed green manure (broadcast 8-10 kg/rai sword bean , 6-8 kg/rai cow pea or 4-6 kg/rai Crotalaria juncia) with soils before flowering and leave for 1-2 weeks. Chemical or liquid LDD fertilizer will also be applied according to recommendation . Plants should be grown on the contour or strip cropping with mulching . Soil should be conserved by vetiver around the areas. Farm ponds are recommended to preserve water to be used in dry season. Apply 200-300 kg/rai or 5kg/pit lime in acid sulfate soils.

Management for orchard : Soil preparation in 50*50*50 pit is to mix 20-35 kg compose fertilizer or animal manure. Conserve the soils by cover crops, mulching, and contour or fencing the tree with vetiver. Application of compose fertilizer or animal manure with chemical or liquid LDD fertilizer at vegetative growth, before and after harvesting. Farm ponds are recommended to preserve water to be used in dry season. Apply 0.5-1.0 kg/pit lime in acid sulfate soils.