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1 Hodnett, M. G.; Bell, J. P.; Batchelor, C. H.; Koon, D. A. H.. 1989. Observations on the wetted zone beneath drip irrigated sugar cane in Mauritius. In Rydzewski, J. R.; Ward, C. F. (Eds.) Irrigation theory and practice. Proceedings of the International Conference, University of Southampton, 12-15 September. London: Pentech Press. pp.630-640.
(Location: IWMI-HQ Call no: 631.7 G000 RYD Record No: H07548)
The distribution of soil moisture potential around emitters spaced 0.75 m apart along driplines buried beneath a crop of sugar cane was monitored throughout the growing season using arrays of mercury manometer tensiometers. The amount of irrigation to apply was determined using estimates of potential evaporation, and effective rainfall model, and crop factors. The potential measurements showed that a wet zone, bounded laterally by steep potential gradients, persisted below the emitter throughout the 5 month period studied. The size and form of the wet zone, or "wetted volume" varied diurnally and through the study period as a result of the sensitive dynamic equilibrium between irrigation, abstraction and drainage. The long term variations in size occurred when irrigation inputs did not exactly match the abstraction by the crop. The results indicate that abstraction by the crop must be taken a pre-determined proportion of the soil profile.
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