Summer Irrigation of Established Oak Trees    (View PDF)

Gary W. Hickman

Abstract: Two trials in California have shown that Valley oaks {Quercus lobata) are benefited by summer irrigation. In the first plot, 30 trees (± 125 years old) were near summer turf irrigation and 135 trees were not. In 1992, six years into a continuing drought, 28% of the non-irrigated trees were dead, while no trees near irrigation died. In a second plot, 11 of 12 irrigated trees had current year shoot growth of 5 to 31 cm, while only 2 of 12 non-irrigated trees showed similar results.

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https://doi.org/10.48044/jauf.1993.006