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Irrigation, crop yield and drainage on the Vaalharts Irrigation Scheme: 1. The contribution of farm water usage, irrigation management and leakage from the canal system to waterlogging



Irrigation, crop yield and drainage on the Vaalharts Irrigation Scheme: 1. The contribution of farm water usage, irrigation management and leakage from the canal system to waterlogging



Water SA 7(2): 97-106



Water use prior to 1972 and during 1978/79 showed that on farms having a GWT > 1.2 m the water use was 84% of the annual available quota, and 76% where the GWT was higher than 0.6 m. Irrigation management was evaluated during 1978/79 on flood-irrigated beds having a GWT at 1.4 m to 2 m and a vigorous groundnut crop. Over-irrigation was prevalent. Measurements during 1968/69 showed that leakage from the canals also contributed to waterlogging.

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