Fig. 1
From: Biological and synthetic approaches to inhibiting nitrification in non-tilled Mediterranean soils
Abundance of total bacteria (a), ammonia-oxidizing bacteria (AOB) (b) and the nirK gene (c) at 20 days post-fertilization (DPF). Control = sorghum without fertilization; AS = sorghum fertilized with ammonium sulfate; AS + D = sorghum fertilized with ammonium sulfate + DMPP. Different letters indicate significant differences using the Duncan test (p < 0.05; n = 4)