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

Jun Wang, Dejian Wang, Gang Zhang, Yuan Wang, Can Wang, Ying Teng and Peter Christie

Agricultural Water Management, 2014, vol. 141, issue C, 66-73

Abstract: 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<0.05) negative exponential relationship with the day after rice transplanting, accounting for an average 2.57mmd−1. NH4+-N and NO3−-N concentration in percolation increased with increasing of N fertilizer application rate. Compared to the control (without straw or fertilizer), the wheat straw incorporation with nil N fertilizer decreased the concentration of NH4+-N and NO3−-N but promoted TP concentration. Cumulative inorganic N (NH4+-N+NO3−-N) and P losses were about 14.4 and 0.53kgha−1, accounting for 5.6% and 3.5% of N and P fertilizer applied. NH4+-N leaching losses accounted for 62–97% of the total leaching of inorganic N. Nitrogen leaching losses occurred mainly at the basal fertilizer application stage, accounting for 76.8% of total N leaching. Straw retention reduced the N leaching losses because the straw can enhance microbial N immobilization due to its high C:N ratio. However, the mechanism of straw incorporation impacts on N and P leaching requires more detailed study.

Keywords: Diffuse pollution; Leaching losses; Nitrogen and phosphorus; Paddy fields; Straw retention; Taihu Lake region (search for similar items in EconPapers)
Date: 2014
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Citations: View citations in EconPapers (13)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:141:y:2014:i:c:p:66-73

DOI: 10.1016/j.agwat.2014.04.008

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