Impact of medium-term summer-planted cover crop (6-yrs) and crop residue retained (+R) or removed (-R) on soil labile and stable fractions of C and N from 0–15 cm depth in site-year 2015.

a-d For each fraction and effect, based on a protected LSD test, means followed by a different letter indicate statistical significant difference (P<0.05). Cmin2d, cumulative 2d soil C mineralization; MBC, microbial biomass C; MBN, microbial biomass N; SLAN, Solvita labile amino N; OC, organic C;, total N; WAS, wet aggregate stability; WEOC, water extractable organic C; WEON, water extractable organic N. z SE, standard error of mean. (XLSX)