摘要:
本文采用田间、盆栽试验,并结合分析化验等方法,进行研究。结果表明:高温多雨的亚热带地区红壤性稻田,在现有肥力水平下,连续施用有机肥,仍有增加土壤有机质积累,改善腐殖质组成作用。但是,施用有机肥,在短期内会使稻田土壤生态发生波动,降低氧化还原电位,增加还原物质的生成,提高pH值。结合施用石灰,可缓和其影响。因此,施用有机肥应提倡结合施石灰。
Abstract:
A large area of lateritic paddy field covers the south of China. One of its basic features is poor fertility with low amount of organic matter, insufficient and imbalanced available nutrition. A series of field, pot experiments and laboratory analysis showed that, the dynamics(accumulation and decomposition)of organic matter in lateritic paddy field has not gotten equilibrium in the high temperature and rainy subtropical area. A succesive 4-year in situ trial treated by different amounts of organic manure showed that the accumulation of soil organic matter is more rapid than that of decomposition and the content of organic matter tends to be raised with the amount of organic manure application, meanwhile, composition of humus has been improved. However, organic manure application can lead to the fluctuation of ecosystem in paddy soil, speed up the reduction process, reduce redox potential, promote the production of reducing matter and decrease pH value in a short duration, this effect will be relaxed if lime is incorperated simultanously.
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