15. Group Soil Series No.15

This group consists of poorly drained, medium-textured ( clay loan to silty clay loan ) soils that develops on alluvial plain or flood plain. They have moderate fertility. Soil reaction is medium acid to neutral. Soils in this group are Lom Sak (La), Maesai (Ms) and Mae Ta (Mta) series.                Most areas are cultivated to paddy rice is rainy season and in dry reason, cash crops are commonly grown.

Problems : Massive structure, low fertility, lack of water in dry season and water logging in rainy season.

Management for rice : Prepare and mix crop residue into moist soils and leave for 3-4 weeks. If managing by green manure, it should be the mixture of 4-6 Kg/rai of 50-70 days Sesbania rostrata and 16-20-0 chemical fertilizer or LDD liquid organic fertilizer in the soils and leave for 1-2 weeks.. Top dressing again with 16-20-0 chemical fertilizer, 35-45 days after transplanting. Farm ponds are recommended to preserve water to be used in dry season or second rice crop or short season upland crops after first rice. If vegetables or legume will be planted, furrows would be constructed with application of 2-3 ton/rai compose fertilizer or animal manure with chemical or liquid LDD fertilizer.

Management for vegetable or orchard : Raised bed to 6-8 meters wide with 1.0-1.5 meters drainage canal. Apply 2-3 ton/rai compose or animal manure with chemical fertilizer or LDD liquid organic fertilizer. Apply 20-35 kg of compose or animal manure into 50*50*50 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.