Nitrogen leaching under corn cultivation stabilized after four years application of pig manure to red soil in subtropical China
2012
Long, Guang-Qiang | Sun, Bo
The impact of long-term pig manure application to a red soil in subtropical China on nitrate leaching was investigated in a field lysimeter experiment from 2002 to 2009. Simultaneously, nitrate leaching was simulated by water and nitrogen management model (WNMM) basing on these observed data to determine the environmental threshold of manure application. Nitrate concentrations in the drainage and nitrate leaching under low manure application (150kgNha⁻¹y⁻¹) did not increase during the study period. Interestingly, the nitrate concentrations in drainage water following high manure application (600kgNha⁻¹y⁻¹) increased exponentially in the first four years and then remained at 13mgl⁻¹ for the next four years. Addition of lime based on high manure application had no significant effect on nitrate concentrations or total nitrate leaching. WNMM simulated the variation in corn yields and nitrate leaching well. The environmentally safe threshold for long-term application of pig manure was 360kgNha⁻¹.
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