Carbonate loss and resulting CO2 emission from croplands: From incorrect calculations to overestimated predictions.

Recently, Raza et al. (2020) reported the acidification-induced soil carbonate loss and resulting CO2 emission from Chinese croplands. Based on a series of calculations, the authors made scenario analyses on soil carbonate loss and subsequent CO2 emission, under different nitrogen (N) fertilization managements. While we agree with the authors that N-induced acidification accelerates carbonate loss from surface soil, we argue that their predictions are substantially overestimated due to several misconceptions in their calculations.