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George E. Boyhan and C. Randy Hill

fertilizers are split-applied ( Mihelic and Jakse, 2001 ). Along with research on organic fertility programs for onions, various green manures have been studied as a N source for onion production. In a study in Denmark it was found that hairy vetch ( Vicia

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T.K. Hartz and P.R. Johnstone

Limited soil nitrogen (N) availability is a common problem in organic vegetable production that often necessitates in-season fertilization. The rate of net nitrogen mineralization (Nmin) from four organic fertilizers (seabird guano, hydrolyzed fish powder, feather meal, and blood meal) containing between 11.7% and 15.8% N was compared in a laboratory incubation. The fertilizers were mixed with soil from a field under organic management and incubated aerobically at constant moisture at 10, 15, 20, and 25 °C. Nmin was determined on samples extracted after 1, 2, 4, and 8 weeks. Rapid Nmin was observed from all fertilizers at all temperatures; within 2 weeks between 47% and 60% of organic N had been mineralized. Temperature had only modest effects, with 8-week Nmin averaging 56% and 66% across fertilizers at 10 and 25 °C, respectively. Across temperatures, 8-week Nmin averaged 60%, 61%, 62%, and 66% for feather meal, seabird guano, fish powder, and blood meal, respectively. Cost per unit of available N (mineralized N + initial inorganic N) varied widely among fertilizers, with feather meal the least and fish powder the most expensive.

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Wendy A. Johnson, Raymond A. Cloyd, James R. Nechols, Kimberly A. Williams, Nathan O. Nelson, Dorith Rotenberg, and Megan M. Kennelly

higher for the conventional fertility treatment (0.71% ± 0.02%) compared with the organic fertility treatment (0.63% ± 0.02%). The concentration of p-coumarin was significantly higher in the organic fertility treatment (12.93 ± 1.18 mg/100 mL) compared

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Stephanie E. Burnett and Lois Berg Stack

organic fertility, it seems logical that fertility management is of concern to conventional and organic growers. Thirty-three percent of conventional growers are concerned about insect management, and 19% feel that disease management would be too great a

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Matt A. Rudisill, Bruce P. Bordelon, Ronald F. Turco, and Lori A. Hoagland

maintain or improve soil quality within these systems. Organic fertility amendments have potential to improve soil quality while meeting nutrient needs in high tunnel systems. However, timing nutrient availability with periods of critical nutrient uptake

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Reuben B. Beverly, Wojciech Florkowski, and John M. Ruter

In response to a mail survey of the landscape maintenance and lawn care (LM-LC) industry in metropolitan Atlanta, we learned that 76% of respondents fertilized lawns and turf and 68% fertilized ornamental beds. Less than one-fourth of those who provided fertilization services offered an organic fertility option; for those who reported an organic option, an average of 25% of their residential customers used such a service. Complete fertilizers (N-P2O5-K2O), ammonium nitrate, urea, and N solutions were the products applied by most respondents. Average amounts of N per application were ≈1.5 lb/1000 ft2 on lawns and 1.1 lb/1000 ft2 on ornamentals. Of firms that provide fertilization services, 88% use a predetermined application schedule, whereas 88% use visual observation and 69% use soil testing to guide fertilizer management. Only 5% reported using tissue analysis as a fertilizer management strategy. Nitrogen fertilizers were applied most frequently in the spring, with nearly equal amounts applied in summer and fall. Phosphorus was applied most commonly in the fall or spring. Relatively few firms reported applying significant amounts of either N or P in winter. Most respondents indicated that they received adequate information about fertilizers, but few received information about organic fertilization. Commercial sales representatives and trade magazines were cited most often as sources of information; university specialists were the least-cited formal source of information concerning fertilization. We have suggested some research and educational issues to be addressed based on these results.

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Mary A. Rogers

well, peat is inert and does not contribute to crop fertility needs. Organic fertility sources for transplant production include fish and seaweed based fertilizers, guano, poultry litter, cottonseed ( Gossypium sp.), soybean ( Glycine max ), and

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-conventional greenhouse growers in Maine in order to determine their priorities for future research related to organic ornamental plant production. Organic growers reported that they are most concerned about management of insects and diseases, organic fertility

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Heidi J. Johnson, Jed B. Colquhoun, and Alvin J. Bussan

organic fertilizer [hereafter referred to as 5-5-5 (Organic Garden Fertilizer, Renaissance Fertilizer Co.)]. The organic fertilizers were used as representatives of commercially available organic fertility management products. The conventional fertilizer

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Heidi J. Johnson, Jed B. Colquhoun, Alvin J. Bussan, and Carrie A.M. Laboski

, Renaissance Fertilizer Co.), were used as representatives of commercially available organic fertility management products. Ammonium nitrate was used as a conventional control. The CPM and amendment sources were analyzed, on a dry matter basis, for actual