28 lines
1.7 KiB
Plaintext
Executable File
28 lines
1.7 KiB
Plaintext
Executable File
TY - JOUR
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T1 - Modelling nitrogen leaching: Are we getting the right answer for the right reason?
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JO - Agricultural Water Management
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VL - 133
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IS -
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SP - 74
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EP - 80
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PY - 2014/2//
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T2 -
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AU - van der Laan, M.
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AU - Annandale, J.G.
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AU - Bristow, K.L.
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AU - Stirzaker, R.J.
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AU - Preez, C.C. du
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AU - Thorburn, P.J.
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SN - 0378-3774
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DO - http://dx.doi.org/10.1016/j.agwat.2013.10.017
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UR - http://www.sciencedirect.com/science/article/pii/S0378377413003041
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KW - APSIM
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KW - DSSAT
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KW - Nitrate
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KW - SWB-Sci
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AB - Abstract
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The complexities and challenges in quantifying N leaching have led to development of a range of measurement and modelling techniques, but none are widely applied. Observations that N moves more slowly than water through the soil profile has resulted in different approaches being used to simulate impeded N movement in crop models: (i) by accounting for nitrate N O 3 − adsorption to the soil, (ii) by considering incomplete mixing between resident and draining soil water fractions or (iii) a combination of both. We compare and discuss strengths and weaknesses of these approaches. Our inability to directly measure model parameters (especially with regards to simulating N dynamics), and the risk of compensating errors during model testing and calibration, often results in low confidence in simulated N leaching. We caution that our current ability to simulate N leaching is in most cases not yet well enough developed for reliable and accurate predictions. We recommend a more strategic approach involving better linking measurement and modelling to improve understanding of the critical soil processes that control N leaching as one way of further improving our understanding and quantification of N leaching.
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ER -
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