Timing citrus and avocado foliar nutrient applications to increase fruit set and size
1999
Lovatt, C.J.
The goal of this research was to identify the role essential nutrients play in the physiology of tree crops, and then to apply the nutrient as a foliar fertilizer to stimulate a specific metabolic process at phenological stages when nutrient demand is high. This approach has proven successful. A single winter prebloom foliar application of nitrogen as low-biuret urea [0.16 kg N/tree (0.35 lb N/tree)] to 30-year-old Washington' navel orange (Citrus sinensis L. Osbeck) trees during flower initiation significantly increased yield and fruit number per tree for each of 3 consecutive years (P less than or equal to 0.05). The number of commercially valuable large-size fruit also increased significantly with yield increases (r(2) = 0.88). Sodium tetraborate applied foliarly to Hass' avocado (Persea americana Mill.) trees at the cauliflower stage of inflorescence development (elongation of inflorescence secondary axes, pollen and ovule development) increased the number of pollen tubes reaching the ovule, ovule viability and cumulative yield (P less than or equal to 0.05). Additional examples are presented.
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