S. A. Weinbaum - Department of Pomology, University of California, Davis, CA 95616

Translocation of 15N from foliar-applied urea to vegetative and reproductive sinks of avocado (Persea americana Mill, cvs. Fuerte and Hass) was evaluated during inflorescence development and the early stages of fruitset. Urea (2%) increased the number and the total dry weight of the lateral inflorescence per shoot. The concentration of I5N in avocado inflorescences increased proportionately to the concentration of urea applied to the old leaf surface. The amount of 15 N translocated was not affected by the proximity of the source leaf to the "terminal" inflorescence.15N translocated to developing fruit and to new sprouting leaves in similar amount. Urea N was translocated basipetally from current flush leaves to developing fruit. Removing the vegetative sink reduced N influx to the reproductive tissue and increased initial fruit set by a factor of 1.7 to 2.1 in urea-treated and -untreated shoots, respectively. These data indicate that shoot growth does not limit fruit set in avocado via competition for N.

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Translocation of foliar-applied urea 15N to reproductive and vegetative sinks of avocado (Persea americana) and its effect on initial fruit set
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S. A. Weinbaum - Department of Pomology, University of California, Davis, CA 95616

Translocation of foliar-applied urea 15N to reproductive and vegetative sinks of avocado (Persea americana) and its effect on initial fruit set

Translocation of 15N from foliar-applied urea to vegetative and reproductive sinks of avocado (Persea americana Mill, cvs. Fuerte and Hass) was evaluated during inflorescence development and the early stages of fruitset. Urea (2%) increased the number and the total dry weight of the lateral inflorescence per shoot. The concentration of I5N in avocado inflorescences increased proportionately to the concentration of urea applied to the old leaf surface. The amount of 15 N translocated was not affected by the proximity of the source leaf to the "terminal" inflorescence.15N translocated to developing fruit and to new sprouting leaves in similar amount. Urea N was translocated basipetally from current flush leaves to developing fruit. Removing the vegetative sink reduced N influx to the reproductive tissue and increased initial fruit set by a factor of 1.7 to 2.1 in urea-treated and -untreated shoots, respectively. These data indicate that shoot growth does not limit fruit set in avocado via competition for N.

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