Abstract
The balance sheet method, keeping an account of evapotranspiration (estimated from evaporation as measured by Bellani plates) and rainfall, was used for scheduling irrigations on a practical field basis on five orchards in Summerland, B.C. Four of the orchards were on the Research Station and the other on a nearby grower’s orchard. Undertree sprinkler irrigation with 12-hour sets, the common method in the Okanagan Valley, was used. Soil moisture deficits were measured by the gravimetric method and estimated from the balance sheet records. Highly significant positive correlations were obtained between the measured and the estimated deficits. The standard error of regression was high, about 20% of the mean. In spite of this, the balance sheet method proved to be quite satisfactory for use in practical scheduling of irrigation in orchards.
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