期刊论文

Effects of Controlled-release Urea Application on Nutrient Distribution of Soil Profile from Double-rice Cropping Field

中文

水土保持学报

1009-2242

2018

32

4

216-221

10.13870/j.cnki.stbcxb.2018.04.034

国家重点研发计划项目“长江中下游水稻湖南化肥农药减施增效技术集成研究与示范”（2016YFD0200809） 湖南省科技厅重点项目“化学肥料污染控制关键技术集成示范”（2016NK2112） 湖南省教育厅平台项目“控释氮肥减量下南方稻田N2O排放特征及对水分管理的响应”（16K040）

本校为第一机构

为探讨双季稻田控释尿素施用对养分在土壤剖面的垂直分布与迁移的影响,通过长期田间定位试验,研究比较普通尿素(U)和控释尿素(CRU)减施稻田剖面的养分累积和分布。结果表明:随着土层深度的增加,土壤全氮、NO_3~-—N、有机质、全磷、速效磷和全钾含量呈下降趋势,NH_4~+—N含量先下降后升高,速效钾含量呈上升趋势,土壤pH升高且趋于稳定。施肥会降低0—20 cm土层pH和速效钾含量。与U处理相比,0—20 cm土层CRU处理全氮含量提高7.72%~19.45%,且随着施N量的增加呈上升趋势; 40—60 cm土层CRU处理NH_4~+—N含量降低6.99%~19.23%。施用CRU可以有效降低土层NH_4~+—N向下淋溶,提高0—40 cm土层全氮和NO_3...

To investigate the effects of controlled-release urea on vertical distribution and migration of nutrients in the profile of double-rice cropping field,a long-term field experiment was conducted to compare common urea (U)and reduction of controlled-release urea(CRU)in nutrient accumulation and distribution of paddy field profile.Results showed that with the increase of soil depth,total N,NO_3~-—N,organic matter,total P, available P and total K content in soil decreased;NH_4~+—N content first decreased and then increased;available K content inc...