Abstract
A computer simulation was conducted to determine emitter flow from a drip irrigation submain unit. Evaluations were made for various commonly used uniformity parameters. The coefficient of variation of emitter flow can be determined from the effects of hydraulics, manufacturer's variation and grouping effect of emitters. A linear cumulative frequency expressed as a straight line can be used to approximate the S-curve from a normal distribution. Simple mathematical equations can be derived from the linear approach for coefficient of variation, per cent of deficit and application efficiency. The optimal irrigation schedule can be determined by considering the cost of water, return of the crops, a linear crop response model and the uniformity of the drip irrigation system.
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