Nitrogen and phosphorus leaching losses from intensively managed paddy fields with straw retention

• Published in: Agricultural water management 2014-07, Vol.141, p.66-73
• Main Authors: Wang, Jun, Wang, Dejian, Zhang, Gang, Wang, Yuan, Wang, Can, Teng, Ying, Christie, Peter
• Format: Article
• Language: English
• Subjects: Accounting; Agricultural and forest climatology and meteorology. Irrigation. Drainage; Agronomy. Soil science and plant productions; Biological and medical sciences; Diffuse pollution; Fertilizing; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; Leaching; Leaching losses; Nitrogen and phosphorus; Oryza sativa; Paddy fields; Percolation; Phosphorus; Rice; Straw; Straw retention; Taihu Lake region; Triticum aestivum; Water management
• ISSN: 0378-3774; 1873-2283
• DOI: 10.1016/j.agwat.2014.04.008

•Leaching characteristics of a paddy field with straw retention were monitored in situ.•Nitrogen and phosphorus leaching losses under different N application rates with straw retention were evaluated.•The percolation rate declined with time after rice transplanting in first-order index attenuation.•N leaching occurred mainly at basal fertilization stage and straw incorporation reduced N leaching but stimulated P leaching. A field experiment was carried out for three years to examine the concentrations of NH4+-N, NO3−-N and dissolved total phosphorus (TP) in leachates and cumulative leaching losses in rice fields with straw retention under different rates of fertilizer N application. With straw retention, the percolation rate had a significant (p