Readme file for Dryad data Zhang et al 2022 Title Contribution of wheat and maize to soil organic carbon in a wheat-maize cropping system: a field and laboratory study Authors "Zheng-Rong Kan, Zhe Chen, Yu-Xin Wei, Ahmad Latif Virk, N¡¯dri Yves Bohoussou, Rattan Lal, Xin Zhao, Hai-Lin Zhang" Experimental design Field experiment+Laboratory incubation "Data was collected in Hebei, China in 2018 and 2019." Dataset contains: 504 observations Abbreviation Description NTR no-till with residue retention NT0 no-till with residue removal PTR plow tillage with residue incorporation PT0 plow tillage with residue removal PR penetration resistance BD bulk density SOC soil organic carbon TN total nitrogen SOC/TN C/N ratio NO3--N nitrate nitrogen NH4+-N ammonium nitrogen AP available phosphorus AK available potassium POC particulate organic carbon DOC dissolved organic carbon LOC permanganate oxidizable organic carbon MBC microbial biomass carbon