Fig. 3. The effect of fertilizer N on mean grain yield of a summer crop following a hairy vetch or rye cover crop or winter fallow (adapted from Bollero and Bullock, 1994).
Fig. 3. The effect of fertilizer N on mean grain yield of a summer crop following a hairy vetch or rye cover crop or winter fallow (adapted from Bollero and Bullock, 1994).