EFFECT OF IRRIGATION INTERVAL ON PEAK FLOW REQUIREMENTS IN SPRINKLER IRRIGATED ORCHARDS

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Abstract
Correlations were calculated between the peak flow of water per acre delivered to 174 orchards in the Okanagan Valley in 1958 and the irrigation interval used—that is, the interval between the start of one irrigation and the start of the next irrigation at the same location. Orchards were omitted where seepage water or wilting was in evidence. High negative correlations were obtained between irrigation interval and peak flow. It is concluded that the smaller the field capacity of the soil for moisture, and hence the shorter the irrigation interval, the greater is the required flow of water per acre. This is attributed to greater wastage of water with coarse-textured soils than with fine-textured soils. Some of this wastage is considered to be unavoidable.

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