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The fl oat system is an effi cient method of seedling production. This system re- quires use of cultural practices to prevent excessive stem elongation of tomato (Lycoper- sicon esculentum Mill.) seedlings. It is not known how these practices affect fi eld growth and subsequent fruit yield and quality. Experiments were conducted in 2001 and 2002 to determine if restricting P supply, delaying fertilizer application, brushing, clipping, and ethephon application affect fi eld performance of transplants. Transplants subjected to these cultural treatments in the fl oat system were compared to transplants conventionally grown in the greenhouse. In 2001, there was little difference in fi eld performance among transplants produced under the range of cultural conditions. Although differences in total fruit numbers or yields were nonsignifi cant in 2002, conventionally grown transplants produced higher early yields. Seedlings grown with low P fertilizer and receiving delayed fertilization or delayed fertilization plus brushing performed best of all fl oat treatments in 2002. Ethephon application severely reduced early yield while increasing late-season yield. Production of tomato seedlings with low P in fl oat systems is feasible, at least on a small scale for transplanting locally, when delayed fertilization or delayed fertilization plus brushing treatments are used to control seedling height.

Field Growth and Yield of Tomato Transplants Grown in the Float System Using Low Phosphorus Fertilizer and Height Restricting Cultural Practices