9. Group of soil Series No.9

This group of soils includes typical acid surface soils that commonly contain high salt content at the soil surface. Most areas have been left abandoned and salt-tolerant plants are commonly grown. Soils in this group is Cha-am (Ca) series.

Problems : Massive structure, strong acid with accumulation of salt, difficult to be prepared, lack of water in dry season and water logging in rainy season.

Management for rice : Prepare and spread 1,000-2,000 kg/rai lime into moist soils, logging water into soils to leach acid and salt. Mix crop residue with soils and leave for 3-4 weeks or apply 50-70 days green manure with LDD organic fertilizer or 16-20-0 chemical fertilizer, 35-45 days after transplanting.Farm ponds are recommended to preserve water to be used in dry season and to leach and control salt in the field.

Management for vegetable or orchard : Raised bed to 6-8 meters wide with 1.0-1.5 meters width and 0.5-1.0 meters depth drainage canal. Spread 1,000-2,000 kg/rai lime into the top soil beds and logging water into soils to leach acid and salt. Soils improvement with 2-3 ton/rai compose fertilizer oranimal manure and chemical or LDD organic fertilizer. Mix 20-35 kg. compose fertilizer or animal manure with 7 kg of lime in 50*50*50 cm. pit for growing orchard. Apply chemical or LDD liquid organic fertilizer with compose fertilizer and animal manure at vegetative growth, before and after harvest. Apply spread of 1,000-2,000 kg/rai lime into acid sulfate soils..