施用尿素、有机-无机复混肥和包膜有机肥对几种水稻田土表水层pH的影响

Effects of Urea,Organic-Inorganic Complex Fertilizers and Coated Organic Fertilizers on Epilimnion pH Values of Paddy Soils

采用不同类型的3种水稻田土壤进行模拟培养,研究施用尿素、有机-无机复混肥和包膜有机肥对土表水层pH变化的影响。实验表明:淹水培养5天以后土表水层pH变化趋势明显。水稻田土壤类型不同,培养期间土表水层pH变化差异显著。在培养后5～15天期间,不施肥对照、施用包膜有机肥处理和施用复混肥处理,红壤、灰潮土和盐碱土土表水层pH都明显上升;施用尿素处理在灰潮土和盐碱土上土表水层pH值略微下降,而在红壤上仍呈上升趋势。

A simulating experiment was conducted in laboratory to verify the effects of urea, organic-inorganic complex fertilizers and coated organic fertilizers on cpilimnion pH values in three types of paddy soils. The results showed that epilimnion pH changed obviously after 5 days of inundated cultivation. There were significant differences in epilimnion pH values between different types of paddy soils during the cultivation. From the 5^th day to the 15^th day of inunduted cultivation, epilirnnion pH values increased in all three types of paddy soils under the treatments of CK, coated organic fertilizers and organic-inorganic complex fertilizers, epilinmion pH values decreased slightly in grey fluvo-aquic and saline-sodic paddy soils but increased in red paddy soils under the treatment of urea.