FIG. 11.

(A) CO consumption by unamended organic layer soils (□) and soils treated with nitrite (1 μmol g [fresh weight]⁻¹) (○). ⧫, relative NO concentrations. (B) CO consumption by organic layer soils before and after treatment with nitrite. The soils were treated as described above, except that they were vented to eliminate accumulation of NO. Open bars, nitrite-treated soils; solid bars, controls. The results are means ± standard errors based on triplicate determinations. gfw, gram (fresh weight).