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Publication Date: February 2015 Download PDF
Lisbon lemons were treated with nitrogen levels ranging from 0.5 to 3.0 lbs. nitrogen per tree annually. Fourth–season yield results from the trial show significant effects of the treatments upon overall yield and leaf nitrogen concentrations, but no effect upon fruit packout. Treatments did lead to a significant effect upon leaf nutrient concentration. Total cumulative yields from 2008 to 2012 (not including the freeze-affected 2011-12 season) were significantly affected by the treatments. Trees treated annually with 2.0 lbs N had the greatest yield, which represented a 12% increase over the yield of trees treated with just 0.5 lbs. nitrogen annually.