The effects of a roster system on irrigation frequency

Abstract An investigation, covering 36 irrigation seasons, was made of the effect of a fixed fortnightly roster system on irrigation demands on Mid‐Canterbury Irrigation Schemes. Irrigation was applied on a roster day if the deficit equalled or exceeded 1 in. Frequency of irrigation, periods of moisture stress, dates of first irrigation, and month by month distribution of irrigations were determined. Under automatic irrigaton the roster system studied would be practical.