Management of acid sulfate rice soils in south China
1989
Li, Jinpei | Huang, Yunian (South China Agricultural Univ., Guangzhou (China))
South China has more than 20,000 ha of salt-affected swamp soil and more than 67,000 cultivated ha of acid sulfate soil. Mangrove swamp soil is muddy, high in nutrients, and essentially anaerobic, with 3.6-4.0% organin matter content, pH 7.3 and 0.6-2.3% total salt content. Three major chemical characteristics of acid sulfate soil are low pH, available P and Ca, and excessive sulfur. Management practices for rice cultivation include constructing separate irrigation and drainage ditches, leaching with fresh water, and maintaining continuous submergence after transplanting. Phosphorus fertilizer and acid-tolerant rice varieties are effective for increasing yields. For dryland crops, drainage ditches should be deep enough to effectively drain the toxicant. Adding mud to raise the surface, mulching with fresh straw and sugarcane leaves, and applying N and P are necessary.
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