Nutrients/Data uncertainties limitations: Difference between revisions
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{{ComponentDataUncertaintyAndLimitationsTemplate | {{ComponentDataUncertaintyAndLimitationsTemplate | ||
|Reference=Bouwman et al., 2009; OECD, 2012; FAO, | |Reference=Bouwman et al., 2009; OECD, 2012; FAO, 2012a; Beusen et al., 2008; | ||
|Description=<h2>Data, uncertainties and limitations</h2> | |Description=<h2>Data, uncertainties and limitations</h2> | ||
===Data=== | ===Data=== | ||
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With regard to uncertainties, the budget calculations and individual input terms for 2000 have been found to be in close agreement ([[Bouwman et al., 2009]]) with detailed country estimates for the member countries of the Organisation for Economic Co-operation and Development ([[OECD]]) ([[OECD, 2012]]). | With regard to uncertainties, the budget calculations and individual input terms for 2000 have been found to be in close agreement ([[Bouwman et al., 2009]]) with detailed country estimates for the member countries of the Organisation for Economic Co-operation and Development ([[OECD]]) ([[OECD, 2012]]). | ||
However, uncertainty is larger for some of the budget terms than for others. Data on fertiliser use are more reliable than on N and P animal excretions, which are calculated from livestock data ([[FAO, | However, uncertainty is larger for some of the budget terms than for others. Data on fertiliser use are more reliable than on N and P animal excretions, which are calculated from livestock data ([[FAO, 2012a]]) and excretion rates per animal category. Data on crop nutrient withdrawal are less certain than on crop production, because the withdrawal is calculated with fixed global nutrient contents of the harvested proportions of marketed crops. In addition to uncertainty in nutrient contents, major uncertainties arise from insufficient data, for instance, on crops that are not marketed and on the use of crop residues. This leads to major uncertainties about nutrient withdrawal. | ||
Sensitivity analysis ([[Beusen et al., 2008]]) has shown that the main determinants of the uncertainty in the nutrient model are: | Sensitivity analysis ([[Beusen et al., 2008]]) has shown that the main determinants of the uncertainty in the nutrient model are: | ||
#N excretion rates; | #N excretion rates; | ||
Revision as of 11:04, 2 May 2014
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