This group of soils is poorly drained, coarse-textured loamy sand or sand and mostly probably found on coastal plain of the country. They are low fertility. Most of the areas are covered with paddy-rice. With relatively low yield due to nutrient deficiency and lacks of water. Soils in this group are Bang Lamung (Blm), Sai Khao (Sak) and Wang Prieng (Wp) series.

Problems: Thick sandy and silty layer soils induce lack of water, water logging in rainy season in some places.

Management for rice: Mix crop residue into moist soils and leave for 3-4 weeks. If managing by green manure, it should be the mixture of 6-8 Kg/rai of 50-70 days Sesbinia rostrata or S. speciosa then leave with 16-16-8 chemical fertilizer or LDD liquid organic fertilizer after 1-2 weeks. Top dressing with 16-16-0 chemical fertilizer, 35-45 days after rice transplanting. Farm ponds are recommended to preserve water to be used in dry season or second rice crop. If vegetables or legume will be planted, furrows would be constructed with application of 3-4 ton/rai compose fertilizer or animal manure with chemical or liquid fertilizer. Apply 500-1,000 kg/rai or 5kg/pit lime in strong acid soils.

Management for vegetable or orchard: Raised bed to 6-8 meters wide with 1.0-1.5 meters drainage canal. Raised bed around the areas then apply 2-3 ton/rai compose fertilizer or animal manure with chemical fertilizer or LDD liquid organic fertilizer. Apply 20-25 kg of compose or animal manure into 75*75*75 meters pit to grow orchard. Apply compose fertilizer or animal manure with chemical fertilizer or LDD liquid organic fertilizer at vegetative growth, before and after harvesting. Farm ponds and water management are recommended to preserve water to be used in dry season. Apply 500-1,000 kg/rai or 5kg/pit lime in strong acid soils.