FIG. 7.

Relative bacterial activity (thymidine incorporation) 48 h after C and N addition to the agricultural soil. The activity of the nonamended control sample was set to 1. Straw was added at the beginning of the experiments. (A) Straw size fraction 1 to 2 mm. (B) Straw size fraction 0.25 to 1 mm. (C) Straw size fraction <0.25 mm. The bars indicate SEs (n = 2) obtained from ANOVA for each separate sampling date. C, N, or CxN over the graph indicates significant effects of carbon, nitrogen, or the interaction of carbon and nitrogen. ∗, P < 0.05; ∗∗, P < 0.01.