Waterlogging, anoxia and wheat growth in surface irrigated soils (original) (raw)

Abstract

Surface irrigation systems are generally designed using engineering or operational criteria and these may not reflect best agronomic practice. In particular, long intake opportunity times (i.e. the time water is ponded above the soil surface during an irrigation) on heavy textured soils can lead to waterlogging and yield loss, so maximum opportunity times are recommended. However, recommended maximum opportunity times for surface irrigation systems in southern NSW are not based on experimental data and they vary widely (8 to 15 hours). Furthermore, there is evidence they might differ with soil type. To examine these two questions, pot and field trials were conducted using a representative crop (wheat) between 2008 and 2010 on soils typical of surface irrigated systems in southern NSW. It was shown there was: • a strong correlation between wheat growth at anthesis and redox potential (E h) when E h dropped below the oxygen limiting threshold of 350 mV. • an explicable relationship be...

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