Fig. 4. The residual effects of manure, compost, and N fertilizer application on soil emission of nitrous oxide at various sampling times in 1999. Vertical bars are standard errors (n = 3) of the least-square means of treatments.
Fig. 4. The residual effects of manure, compost, and N fertilizer application on soil emission of nitrous oxide at various sampling times in 1999. Vertical bars are standard errors (n = 3) of the least-square means of treatments.