关键词: 生物炭, 石灰, 双季稻, 产量, 土壤性状, 经济效益

Abstract:

The study examined the effects of two acid soil ameliorants（lime and biochar）on yield and economic benefit of double rice and soil properties. The results showed that the biochar treatment reduced the yield of early rice and late rice in 2015, the yield of late rice was significantly decreased. However, it significantly increased the yield of early rice and late rice in 2016. The lime treatment increased the yield of early rice in 2015, significantly increased the yield of late rice in 2015 and the yield of early rice and late rice in 2016. After two years of experiment, biochar significantly increased soil pH and organic matter content. Lime significantly increased soil pH and the concentration of alkaline hydrolysis-N. Biochar treatment significantly reduced the output value and net income in 2015 and significantly increased them in 2016. Lime significantly increased the output value and net income in both 2015 and 2016. Lime increased the output value and net income by 2.9% and 6.7% compared to the biochar treatment in 2016, respectively. Therefore, lime was better than biochar to increase yield and economic benefit of rice, and to ameliorate soil acidification in the double rice-copping system in southern China.

Key words: biochar, lime, double rice, yield, soil property, economic benefit