344 PRETRANSPLANT NUTRIENT CONDITIONING: NITROGEN REGIMES FOR FLORIDA TOMATO TRANSPLANTS

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  • 1 University of Florida, Southwest Florida Research & Education Center, P.O. Drawer 5127, Immokalee, FL 33934
  • | 2 University of Florida, Horticultural Sciences Department, Gainesville, FL 32611

`Allstar” tomatoes raised from seed in Todd™ containerized transplant trays were treated with 1/4 strength Hoagland's solution modified to supply 0, 15, 30, 45, 60, or 75 mg·l-1 N daily. Nutrient application was achieved via ebb and flow irrigation. N was supplied as ammonium nitrate. Tissue sample values for elements tested, excluding N, were essentially adequate for all treatments at transplanting (6 weeks after seeding). Visible transplant differences in the plant house did not translate to significant yield differences in the field when rates of 30 mg·l-1 or greater were used in either spring or fall plantings in FL. A similar trial shipped to PA showed that 75 mg·l-1 in the plant house resulted in the greatest early field yields, but 45 mg·l-1 produced the greatest overall yield.

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