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Abstract
The objective of this study was to evaluate bat guano, blood meal, broiler litter, and feather meal as fertilizers for organic transplant production of broccoli, cabbage, lettuce, basil, tomato, and watermelon transplants. The results indicated the four organic fertilizers evaluated can produce quality transplants at a total of 4000 mg N/ kg medium and compared well to an inorganic fertilizer (200 mg N/ L weekly). Broiler litter raised the media pH. Bat guano and broiler litter had larger amounts of dissolved salts than the other organic fertilizers. Blood meal and feather meal had larger seedling mortality than the rest of the fertilizers for most species. Bat guano, blood meal, broiler litter, and feather meal are acceptable organic fertilizers but depending on the concentration they may increase the pH or the concentration of salts in the substrate to levels that may be deleterious to the transplants.