5. Group of soil Series No.5

This group consists of poorly drained, fine-textured ( clay or silty clay ) soils that occur mostly on flood plain or alluvial plain. They are moderately low fertility and the reaction is neutral to slightly alkaline. Soils in this group are Hang Dong (Hd), La Ngu (Lgu) and Phan (Ph) series.                Most of the areas have been used for cultivation of paddy rice in rainy season. In dry season, cash crops i.e. tobacco, legume and garlic are commonly cultivated.

Problems : Lack of water in some places, low fertility 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,35-40 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.

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 fertilizer 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 again at vegetative growth, before and after harvesting. Farm ponds and water management are recommended to preserve water to be used in dry season.