Land Development Techniques

	From the survay conducted by Land Development Department, acid sulfate soil is found in the Center of Thailand covering Nakhon Nayok, Ayutthaya, Pathum Thani, Saraburi, Chachoengsao, Chon Buri, Prachin Buri, Samut Prakan, Nakhon Pathom, Suphan Buri, Nonthaburi, Bangkok and Ratchaburi. Its total area is 6 million rai. How to reclaim acid sulfate soil 1. Before transplanting, fill water and drain it. Do like this again and in order to leach acid and toxic substance from the soil. 2. Add the lime like slaked lime, marl or ground limestone to decrease acidity in soil. 3. After adding the lime, leave it 7-10 days. Then, add fertilizer consisted of Phosphorus before transplanting.
Acid sulfate soil is the soil which its amount of sulfuric acid is enough to cease plant growth and decrease crop yield. How to observe acid sulfate soil area 1. Dig the soil about 50 cm. and find yellow sulfuric compound called 'Jarosite' scattered among red and brown compound. 2. Water in the area is clear like begin swung by alum. Its taste is acid or sour. Area where acid sulfate soil is found in the Center Acid sulfate soil is found in rather plain or plain area in Thailand.
	Next