Fig. 5: Cropland soil pH declines at the depth of the enhanced nitrification layer. | Nature Communications

Fig. 5: Cropland soil pH declines at the depth of the enhanced nitrification layer.

From: Preventing subsoil enhanced nitrification to safeguard agroecosystem sustainability

Fig. 5: Cropland soil pH declines at the depth of the enhanced nitrification layer.The alternative text for this image may have been generated using AI.

a Vertical patterns of soil pH in global croplands at different periods. The data are shown with a mean ± 95% confidence interval. The data on soil pH in croplands are extracted from the World Soil Information Service (WoSIS) database based on the global distribution of croplands at different periods (see Methods). The site locations of soil pH (1961–2015) in global croplands are presented in the world map at the top right corner. b Soil pH changes at 0.6 m depth compared to the mean of the adjacent five soil layers (the main subsoil depths within 1 m where nitrification occurs, based on refs. 48,49,50,51) over time. c The relationship between soil pH and soil TN at 0.6 m depth.

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