7. Group of soil Series No.7

This group of soils is poorly drained or somewhat poorly drained, fine textured ( clay loam or silty clay loam to clay or silty clay, that commonly occur on flood plain and low-lying terrace or alluvial fans. They are moderate fertility with reaction ranging from medium acid to neutral. Soils in this group are Doembang (Db), Nan (Na), Nakhon Pathom (Np), Pak Kat (Pat), Suko Thai (Skt), Tatum (Tt), Uttaradit (Utt) and Ra Nod (Ran) series.                Paddy rice have been cultivated in most of the areas in rainy season and cash crops in dry season.

Problems : Massive structure, 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 or S. speciosa 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,35-40 days after transplanting. Farm ponds are recommended to preserve water to be used in dry season or second rice crop or short season crops after first rice. After harvesting second crop, 1-2 ton/rai compose fertilizer or animal manure with chemical fertilizer or LDD liquid organic fertilizer should be applied.

Management for vegetable or orchard : Raised bed to 6-8 meters wide with 1.0-1.5 meters drainage canal. Reduce acidity by application of broadcast 200-300 kg/rai lime. Apply 1-2 ton/rai compose fertilizer or animal manure with chemical fertilizer or LDD liquid organic fertilizer. Apply 15-25 kg of compose fertilizer or animal manure and 5 kg of lime 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.