Land Model: A Simulation Tool for Estimating the Nutrient Dynamics from Land-applied Animal Manure
Hitchcock, Daniel R.
Cabrera, Miguel L.
Smith, Matt C.
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The primary objective of this study is to develop a simulation model for predicting nutrient fluxes from the land application of animal waste, resulting in the Land Application Nutrient Dynamics (LAND) model. The simulation model is being developed in STELLA® software focusing on the following processes: 1) microbial decomposition of biomass and organic waste constituents; 2) the plant uptake of nutrients, and 3) the volatilization, assimilation, runoff, and leaching of nitrogen compounds. Model structure is based on the PHOENIX model for carbon and nitrogen dynamics in grassland soils with modifications for hydrological processes. Model parameterization and calibration were based on literature values and published data. This model could aid in a better understanding of the physical, chemical, and biological processes that determine the fate and transport of nutrients, mainly carbon and nitrogen, upon application of animal waste to grassland field systems. This should also aid in developing effective nutrient management strategies for confined animal feeding operations (CAFOs). Preliminary information is presented in this paper.