51. Group of Soil Series No.51

This group is all shallow soils to bed rocks on erosional surface, hills and mountains with high precipitation. They are low fertility. Soils in this group are Huai Yot (Ho), Khlong Teng (Klt), Ranong (Rg) and Yi Ngor (Yg) series.                Majority of the land use is evergreen forest. Some parts are rubbers, oil palm and fruit trees.

Problems : Low fertility shallow soils to skeletal layer (0-50 cm), gravels or rock fragment on the soil surface, lack of water in dry season and soil erosion on steep slope. Very shallow, gravelly or lateritic soils that are not suitable for agriculture would be leave to be forest, graze land or fast growing trees.

Management for upland crops or vegetables : Upland and vegetable crops could be grown on thick leveled top soils with crop rotation. It needs to be improved with 3-4 ton/rai compose fertilizer or animal manure or mixed green manure (broadcast 10-12 kg/rai sword bean , 8-10 kg/rai cow pea or 6-8 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 . Farm ponds are recommended to preserve water to be used in dry season.

Management for orchard : Soil preparation in 50*50*50 pit is to mix 50 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.