Fig. 4. Sum of phospholipid fatty acids (PLFAs) of (A) bacterial and (B) fungal biomarkers by treatment in December 2004 at the end of the field station trial. NT = no-tillage; ST = standard tillage; CC = continuous cropping; and F = fallow. Data are means ± SE. Means followed by the same letter are not significantly different at the P < 0.05 level. Differences indicated by a and b (0–5-cm layer), and s and x (5–15 and 15–30 cm, respectively).