Variable-rate irrigation using VARIwise. Application in CPLM overhead cotton

Variable-rate irrigation technology and prescription map development software (e.g. ‘VARIwise’) can match irrigation to crop water requirements with spatial and temporal changes in soil type and growth stage.  Trials of variable-rate irrigation and VARIwise technology have demonstrated yield improvements as well as water and labour savings in centre pivot cotton production. In a 50ha field, these benefits generated an internal rate of return of 23% with a 5 year payback period.