Full TGIF Record # 59345
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Web URL(s):http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2494.1999.00145.x/epdf
    Last checked: 10/02/2015
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Publication Type:
i
Refereed
Author(s):Wu, L.; McGechan, M. B.
Author Affiliation:Soils Department, The Scottish Agricultural College (SAC), Edinburgh, UK
Title:Simulation of nitrogen uptake, fixation and leaching in a grass/white clover mixture
Source:Grass and Forage Science. Vol. 54, No. 1, March 1999, p. 30-41.
# of Pages:12
Publishing Information:Oxford, Blackwell Scientific Publications
Keywords:TIC Keywords: Nitrogen uptake; Nitrogen fixation; Nitrogen; Leaching; Trifolium repens; Lolium perenne; Seed mixtures; Models; Yield response; Nitrogen cycle
Abstract/Contents:"To represent nitrogen cycling in a low input grass/legume pasture system, a previously developed, weather-driven grass/white clover growth model has been adapted to become the crop growth component of the soil nitrogen dynamics model SOILN. This provides a means of simulating nitrogen uptake by a grass/white clover crop, an important component of the overall nitrogen balance in low-input grassland systems. Crop growth is represented by a photosynthesis equation adapted to take account of competition between the two crops for resources of light, water, and nitrogen in the soil. Water shortage is represented by linked simulations with the soil water and heat model SOIL, and nitrogen shortage by links with the SOILN model. Nitrogen fixation has been introduced according to an equation for potential fixation reduced by environmental factors, particularly temperature. Transfer of nitrogen-rich clover plant material to the soil nitrogen pools of SOILN (from where it becomes available as a nutrient for grass) is also represented. The model is tested by comparing simulated cut crop yields and nitrogen content of cut material with measured data from perennial ryegrass/white clover at a test site. Soil nitrogen processes in the model are tested by comparing simulated and measured nitrate in drainflows. Apart from some discrepancies between simulated and measured results attributable to the inherent instability of a mixed crop system, agreement is reasonable by the standards of biological system models, indicating that the combined model gives a realistic representation of carbon and nitrogen processes in grassland with a grass, legume mixed crop."
Language:English
References:39
Note:Tables
Graphs
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Wu, L., and M. B. McGechan. 1999. Simulation of nitrogen uptake, fixation and leaching in a grass/white clover mixture. Grass Forage Sci. 54(1):p. 30-41.
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Web URL(s):
http://onlinelibrary.wiley.com/doi/10.1046/j.1365-2494.1999.00145.x/epdf
    Last checked: 10/02/2015
    Requires: PDF Reader
    Access conditions: Item is within a limited-access website
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MSU catalog number: SB 197 .B7
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