Site
Planting years
Rotation
Treatment
Total K balance
Soil available K
Clay mineralogy (cg value)
Reference
Chongqing 1991-2000 Rice-wheat -K -1686.6 56.0 (Xiong et al., 2003)
+K -712.9 84.2
+K+S -12.2 88.1
Henan 1989-2005 Maize-wheat -K -2352 59 (Sun et al., 2009)
+K 513 275
+K+S 636 234
Hubei 2014-2017 Rice-rape -K -780 51.4 1.12 (Zhu et al., 2019)
+K -894 62.8 1.11
+K+S 29 79.0 1.12
Hunan 1981-2012 Rice-rice -K -3308 95 1.17 (Liao et al., 2017)
+K -607 159 1.15
+K+S 287 220 1.14