Abstract
Recent research suggests that celery (Apium graveolens var. dulce) produced on Florida Histosols does not respond to rates of K fertilizer as high as previously recommended. The soil-test Na levels of Florida Histosols have been increasing as a result of canal dredging which has exposed saline water from shallow aquifers to mixing with surface water used for irrigation. Sand culture and field experiments were conducted to obtain a better understanding of the effect of Na on the K nutritional requirement of celery. The sand culture experiment included factorial combinations of 0, 2, 4, and 8 mM concentrations of K and 0 and 0.5 mM concentrations of Na. The field experiment was a 13 point fractional factorial with K and Na rates ranging from 0 to 400 kg ha-1. The data indicated that Na partially substituted for the K requirement of celery when K was limiting growth and yield. Interestingly, the data also suggested that optimal celery yields were obtained when some Na was present even where K was not limiting.
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