Dissolved oxygen
During SPC trials on Farm A the mean dissolved oxygen (DO) was13.6 ± 4.9 mg/L (9.9–26.5 mg/L) and was 9.4 ± 0.3 (9.1–10.1 mg/L)in FOR trials; mean DO in liquid SPC trials on farm B was4.8 ± 1.6 mg/L (2.8–6.5 mg/L) and 7.8 ± 2.5 mg/L (4.8–11.4 mg/L)in granular SPC trials; mean DO in FOR trials on farm C were8.9 ± 1.7 mg/L (6.5–11 mg/L); and mean DO in SPC trials on farmD were 11.1 ± 3.3 mg/L (7.7–19.6 mg/L) (Table 5).