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Compost and Manure Mediated Impacts on Soilborne Pathogens and Soil Quality

^a Univ. of Vermont Extension, 278 S. Main St, St. Albans, VT 05478
^b Dep. of Horticulture, Oregon State Univ., 4017 ALS, Corvallis, OR, 97331
^c School of Natural Resources, Ohio State Univ., Columbus, OH

View larger version (60K): [in a new window]   Fig. 1. Impact of high and low rates of separated dairy manure solids (MS) and composted separated dairy manure solids (MSC) amendment at 2 and 12 mo after the first amendment on (a) severity of damping-off (DO) of cucumber, (c) severity of root rot of bean, and (e) root rot of sweet corn and at 2 and 6 mo after the second amendment on (b) severity of DO of cucumber, (d) severity of root rot of bean and (f) severity of root rot of corn. Within each disease and sampling time, treatment bars followed by the same letter are not significantly different (P < 0.05).

View larger version (24K): [in a new window]   Fig. 2. Relationship between severity of damping-off (DO) of cucumber and (a) free particulate organic matter, (b) FDA activity, (c) microbial biomass C, and (d) water-stable aggregates. Regressions are across three sample times, 2 mo after the first amendment (), 12 mo after the first amendment (•), and 2 mo after the second amendment (). Each solid line represents a statistically derived "suppressive threshold": the level of disease severity significantly different from the control (P < 0.05).

View larger version (31K): [in a new window]   Fig. 3. Relationship between severity of root rot of snap bean and (a) free particulate organic matter, (b) FDA activity, (c) microbial biomass C, and (d) water-stable aggregates. Regressions are across three sample times, 2 mo after the first amendment (), 12 mo after the first amendment (•), and 2 mo after the second amendment (). Each solid line represents a statistically derived "suppressive threshold": the level of disease severity significantly different from the control (P < 0.05).

View larger version (38K): [in a new window]   Fig. 4. Relationship between severity of root rot of sweet corn and (a) free particulate organic matter, (b) FDA activity, (c) microbial biomass-C, and (d) water-stable aggregates. Regressions are presented across three sample times as well as at 12 and 2 mo after amendments, 2 mo after the first amendment (), 12 mo after the first amendment (•), and 2 mo after the second amendment (). Each solid line represents a statistically derived "suppressive threshold": the level of disease severity significantly different from the control (P < 0.05).

View larger version (19K): [in a new window]   Fig. 5. Relationship between free particulate organic matter and (a) FDA activity, (b) microbial biomass C, and (c) water-stable aggregates. With the exception of Fig. 5a, regressions are across three sampling dates, 2 mo after the first amendment (), 12 mo after the first amendment (•), and 2 mo after the second amendment ().