Thursday, 10 November 2005 - 9:45 AM
311-7

Class Α Biosolid-Based Fertilizer in Minor Use Vegetable Production.

Whitney O'Hanian and W. Michael Sullivan. University of Rhode Island, 9 East Alumni Avenue, Suite 7, Kingston, RI 02881

Class A “Exceptional Quality” (EQ) biosolids are recycled from municipal sewage sludge through a high temperature based treatment process and transformed into a fertilizer product regulated by the USEPA and state agencies. The product is readily available within the Northeastern USA and appears to be underutilized in agricultural and horticultural industries. The primary objective of this study was to identify appropriate application rates for a biosolid-based fertilizer in the production of several minor use vegetable crops. Crops were evaluated for differences in growth and development, including days to first flower and first fruit, total yield, total biomass, and total root mass. Soil nitrate levels were measured every 10 to 14 days throughout the growing season to gauge the rate of decomposition for the biosolid-based fertilizer pellets and concurrent nitrogen mineralization. Five different nitrogen application rates 0, 33.61, 67.24, 100.86 and 134.47 kg ha -1 were made via appropriate biosolid applications on a well-drained Bridgehampton silt loam (coarse-silty, mixed, mesic Typic Dystrochrept) in Kingston, RI, based on pre-plant soil tests and anticipated crop needs. All crops displayed a curvilinear response to fertilizer application for the one growing season reported. Response curves indicate that 95% of the yield variation in tomatoes [Lycopersicon lycopersicum] and 75% of the variation in eggplant [Solanum meogena] yield was directly attributable to biosolid application rate.

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