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Experiments were conducted in north Florida and south Georgia to determine the effects of H 2 CN 2  sprays on vegetative and reproductive growth of blueberry. In Florida, mature, field-grown `Misty' southern highbush ( Vaccinium corymbosum  L. hybrid) blueberry plants were sprayed to drip with 0, 10.2, or 20.4 g·L -1  of H 2 CN 2  [hereafter referred to as 0%, 1.0%, and 2.0% (v/v) H 2 CN 2 ] on 20 Dec. 1996 and 7 Jan. 1997. During the following winter, mature `Misty' southern highbush and `Climax' rabbiteye ( V. ashei  Reade) plants were sprayed to drip with 0, 7.6, or 15.3 g·L -1  of H 2 CN 2  [hereafter referred to as 0%, 0.75%, and 1.5% (v/v) H 2 CN 2 ] on 17 Dec. 1997 and 6 Jan. 1998. For all experiments, plants were dormant and leafless, with slightly swollen flower buds, at the time of spray applications. Generally, H 2 CN 2  sprays increased the extent and earliness of vegetative budbreak and canopy establishment and advanced flowering slightly. The number of vegetative budbreaks usually increased linearly with increasing spray concentrations. In Florida, H 2 CN 2  [0.75% to 1.0% (v/v)] sprays increased mean fruit fresh weight and yield, and shortened the fruit development period (FDP) compared to controls. However, H 2 CN 2  sprays ranging in concentration from 1.5% to 2.0% (v/v) resulted in significant flower bud injury and reduced total fruit yield compared to controls. In south Georgia, 27 of 37 field trials conducted between 1991 and 1998 on several rabbiteye and southern highbush cultivars indicated that leaf development was significantly enhanced by H 2 CN 2 . H 2 CN 2  shows potential for increasing early fruit maturity, fruit size, and yield of southern highbush and rabbiteye blueberry cultivars with poor leaf development characteristics in low-chill production regions. Chemical name used: hydrogen cyanamide (H 2 CN 2 ).

Hydrogen Cyanamide Accelerates Vegetative Budbreak and Shortens Fruit Development Period of Blueberry