A conceptual model for conducting nutrient audits at national, regional, and global scales

By W. Sheldrick, J. Syers, J. Lingard. Nutrient Cycling in Agroecosystems, 2004

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A high-resolution assessment on global nitrogen flows in cropland (2010, background): “(5) and higher than that of 43% reported by Bouwman et al.”
Global Soil Nutrient Depletion and Yield Reduction (2005, unknown): “It is defined as the percentage of nutrient input that is recovered as nutrient output in crops (Sheldrick et al., 2002).”
Assessing soil fertility decline in the tropics using soil chemical data (2006, background): “Nutrient balance studies in tropical regions have been influential—both agronomically and politically—but there are some methodological problems (Faerge and Magid, 2004; Sheldrick et al., 2002).”
Agricultural production and soil nutrient mining in Africa: implications for resource conservation and policy development. (2006, background): “…(1983,1985), Gigou et al. 13 (1985), Stoorvogel (1993), Smaling (1993), Smaling and Fresco (1993), van Duivenbooden (1990), van der Pol (1992), Henao and Baanante (1999), OECD (2001) and by recent approaches as suggested by FAO (2004a) and Sheldrick et al. (2002) and Sheldrick and Lingard (2004).”
Agronomic phosphorus imbalances across the world's croplands (2011, methodology): “(18) because of their lower manure and fertilizer estimates (Table S1).”