431 PB 174 EFFECTS OF FALL APPLIED BORON ON ALMOND FRUIT SET

in HortScience
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  • 1 University of California, Department of Pomology, Davis. CA 95616

Fruit set is a major determinant of nut productivity. Boron has been shown to have a significant influence on flowering and fruit set in a number of crops but less is reported on almond. This paper presents results of foliar application of a B commercial product, Solubor(20.5% B) at a rate of 1,2,3lb/100 gallons to `Butte' and `Mono' almond cultivars Boron at 1 and 2lb increased fruit set in both open and hand pollinated trees by over 100% while 3lb was less effective. The resultant B concentration in flower buds was correlated to B concentration in flowers (R2=0.58) and immature fruits (R2=0.6) but not to summer and fall leaf, pistil, and pollen B concentration or fruit set.

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