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Flooding Duration and Seasonal Effects on Growth and Development of Young Rabbiteye Blueberry Plants


The response of 3-year-old ‘Woodard’ rabbiteye blueberry (Vaccinium ashei Reade) plants to 0, 5,15, 25, and 35 days of flooding during spring and summer of 1984 and 1985 was studied under field conditions. Soil oxygen diffusion rate (ODR) and redox potential (Eh) of flooded plots were significantly lower than those of unflooded plots within 2 days of flooding. After plots were released from flooding, soil Eh recovered to control levels within 10 days but ODR did not. Almost 100% of the plants survived flooding treatments in 1984, whereas plant survival decreased to 83% after 25 days of spring and 67% after 5 days of summer flooding in 1985. Stem elongation and leaf expansion were inhibited after about 15 days of spring and 7 days of summer flooding. The number of flower buds formed during the fall was reduced by about 30% and 70% after as little as 5 days of summer flooding in 1984 and 1985, respectively. Fruit set decreased by 13% and 29% after 25 days of spring flooding in 1984 and 1985, respectively. Yields were not consistently affected by spring flooding, but decreased significantly after 35 days in 1984 and 25 days in 1985.