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Residuals from the general regression if 
Phase I against pH (model: 
= 1.64–0.18*pH, see Fig6a), plotted against the annual input of total nitrogen (mineral N + organic N). Data for single vials with soil from Gongzhuling (GZL, 
), Shangzhuang (SZ,
), Qiyang (QY,
), Changwu (CW,
), and Shouguang (SG,
) are shown. Trends are shown for individual sites.
