Previous work in our laboratory demonstrated that B promotes flowering, fruit set, and yield in almond. A positive response of almond tissue B concentration, fruit set, and yield to B application was observed. Positive correlations between tissue B concentration with fruit set or yield were found when B was applied at 0–1.67 kg B/ha. An investigation was undertaken to test whether the time of B application had a significant effect on B concentration and yield in almond. Solubor (20.5% B) was applied at 0.8 and 1.67 kg B/ha during fall (September), winter (December), and spring (February) to `Butte' (pollinizer) and `Mono' (pistil donor). Results show that for most attributes, September application was more effective than spring and winter. `Butte' was more responsive to B application than `Mono'.
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