Table 1. Nitrogen budget in cropland area for soil model from Almaraz et al. (15) (average mass balance data are preliminary estimates in preparation).

Flux	Mean (kg N ha−1 year−1)
Deposition	8.64
Irrigation	6.73
Fixation	41.8
Fertilizer	131.8
Harvest	100.4
Ammonia	5.39
Leaching	36.8
Denitrification	36.2