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Fig. 1. Ratio of CFUs of copiotrophic bacteria to total micro-scopic counts of bacteria 1 day before, 1 day after and 1, 2,3, 5, and 7 weeks after incorporation of a vetch/oats cover crop(‘Cover crop’) or the same amount of vetch/oats cover crop foliage(‘Fallow+debris’) into soil, or after leaving the soil unamended(‘Unamended’).
Fig. 2. Ratio of CFUs of copiotrophic to oligotrophic bacteria 1 daybefore, 1 day after and 1, 2, 3, 5, and 7 weeks after incorporationof a vetch/oats cover crop (‘Cover crop’) or the same amount ofvetch/oats cover crop foliage (‘Fallow+debris’) into soil, or afterleaving the soil unamended (‘Unamended’).
Fig. 3. Number of corky root (Pyrenochaeta lycopersiciper tomato root (A), and percentage of root tips with softrot() lesionsPhytophthora or Pythium sp.) (B) in organic 4-year rotation,low-input 4-year rotation, conventional 4-year rotation, and con-ventional 2-year rotation plots at the sustainable agriculture farm-ing systems (SAFS) field site at UC Davis in 1997 and 1998.
Fig. 4. Damping-off of tomato seedlings caused by Pythiuminto soil, or after leaving the soil unamended (‘Unamended’) (nosoil collected 7 weeks after incorporation, compare with Figs

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