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- W287748358 abstract "In the Willamette Valley of Oregon root rot of snap bean (Phaseolus vulgaris L.) and sweet corn (Zea mays L.) cause economic losses to farmers. This study was conducted to determine whether fresh or composted dairy manure amendments could suppress root diseases and to describe relationships between disease severity and soil characteristics. Field plots were amended with high or low rates of fresh or composted dairy manure in 2001 and 2002. Soils were collected at 2 and 12 months after the first amendment and 2 and 6 months after the second amendment. Greenhouse bioassays were conducted in treated soils to assess severity of damping-off of cucumber (Cucumis sativus L.) and root rots of snap bean and sweet corn. Soils were analyzed for soil free (fPOM) and occluded (oPOM) particulate organic matter content, rate of hydrolysis of fluorescein diacetate (FDA activity), arylsulfatase activity, microbial biomass-C, and percent water stable aggregates (WSA). Two months after amendment, all amendments (except the low rate of manure) reduced the severity of damping-off of cucumber 44 %, root rot of snap bean 25 %, and root rot of sweet corn 52 % compared to the non-amended control. Twelve months after amendment, amended soils no longer suppressed the diseases. All amendments were suppressive after reamendment the following year, and all were no longer suppressive 6 months later. Negative relationships were observed between severity of all three diseases and fPOM, FDA activity, microbial biomass-C, and WSA. Overall, FDA activity was the best indicator of soil organic matter (SOM)-mediated disease suppressive potential. Speaker Information: Heather Darby, University of Vermont Extension, University of Vermont Extension 278 South Main St, St Albans, VT 05478; Phone: (802) 524-6501 ext. 206; E-mail: hdarby@zoo.uvm.edu" @default.
- W287748358 created "2016-06-24" @default.
- W287748358 creator A5077313779 @default.
- W287748358 date "2003-03-05" @default.
- W287748358 modified "2023-09-27" @default.
- W287748358 title "Soil organic matter management and root health" @default.
- W287748358 hasPublicationYear "2003" @default.
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