Modeling long-term compost application effects on nitrate leaching

摘要: Application of compost to agricultural soils may be beneficial for crop production by increasing soil fertility and supplying plant nutrients, however, any raise the organic matter content increase potential unintended groundwater contamination nitrate leaching. In this paper, effect long-term applications on leaching, content, is analyzed using results simulation scenarios sites with loamy sandy soils. Simulations were carried out Danish Nitrogen Simulation System (DAISY) which describes nitrogen balance in a one-dimensional soil-plant-atmosphere system considers type application rate as well management cropping practice. Estimations hydraulic solute transport parameters are based pedotransfer functions. Data from 4.5-year period field experiments northern Germany laboratory amended used model calibration. suggest that: (i) respect turnover differences between types (i.e., non-matured matured) small compared site-specific properties temperature water balance) practices rotation) when considering 50 years; (ii) leaching different highly sensitive at sand relatively loam site; (iii) high yields acceptably low concentrations drainage obtained site applying combination 10 t compost/ha/yr soil- Nmin adjusted mineral additions about 20 kg/ha/yr winter-grain dominated rotation. Further optimization possible reduced rates (economically interesting) compost.