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A two-factor factorial, randomized block design was used to study the influence of root-zone temperature (RZT) and fertilization regime (Fert) on early growth and development of pawpaw seedlings in the greenhouse. Stratified seeds were sown in 45-inch 3  Rootrainer cells in Promix BX potting medium. Plants were watered/fertilized twice weekly to runoff. RZT was at two levels—ambient (75F–Amb) or bottom-heated (90F–Heat), and it commenced at sowing date. Fert was at four levels—125, 250, 500, or 1000 ppm Peter's 20N–20P–20K plus soluble trace elements, and it commenced at emergence date. Bench position in the greenhouse was used as the blocking variable (three blocks). The 20 most uniform seedlings were selected from each treatment/block for weekly growth measurements. At the termination of the experiment (equivalent to time for transplanting to a larger container), 10 plants per treatment/block were harvested destructively. RZT significantly influenced time to seedling emergence where Heat seedlings emerged 10 days earlier than Amb seedlings. Heat plants were significantly taller, had greater trunk diameter, leaf number, and leaf area than Amb plants. Fert at 125 to 250 ppm resulted in the most robust seedlings, with 1000 ppm Fert often inducing early terminal bud set. Impact of RZT and Fert on seedling development over time will be discussed.

The Influence of Root-zone Temperature and Fertilization Regime on Early Growth and Development of Pawpaw (Asimina triloba Dunal) Seedlings