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Research question

Selection of irrigation duration for high performance furrow irrigation on cracking clay soils Rod Smith, Jasim Uddin , Malcolm Gillies. Research question. Is there a simple objective way of estimating time to cut-off for furrows in real-time &

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Research question

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  1. Selection of irrigation duration for high performance furrow irrigation on cracking clay soilsRod Smith, JasimUddin, Malcolm Gillies

  2. Research question Is there a simple objective way of estimating time to cut-off for furrows in real-time & that does not require substantial data or complex computation

  3. Typical infiltration curves for a cracking clay soil

  4. Irrigation performance – various flow rates – 5% runoff

  5. Tcovs advance time to mid-way down furrow

  6. Data for 4 furrows x 4 irrigations

  7. Example application efficiencies (%) – one field – average of four furrows

  8. Application efficiencies (%) – single furrows * advance did not reach end of field

  9. Summary • Three methods compared: • ‘Autofurrow’ • Set distance cut-off • Guidelines based on advance rate • Common features • Data collected during an irrigation is used to control that irrigation • Speed of advance is a function of flow rate, soil properties, moisture deficit • Hence adapt to changes in those variables

  10. Summary • ‘Autofurrow’ is a reliable predictor of Tco but is data and computationally intensive. • The two simpler alternative methods give deliver performance generally equivalent to ‘Autofurrow’ and each other – but some variability • All methods deliver better performance than the ‘average’ grower • All three methods benefit from fine tuning, either manually or as self learning in automated systems

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