Presentation is loading. Please wait.

Presentation is loading. Please wait.

Selection of irrigation duration for high performance furrow irrigation on cracking clay soils Rod Smith, Jasim Uddin, Malcolm Gillies.

Similar presentations


Presentation on theme: "Selection of irrigation duration for high performance furrow irrigation on cracking clay soils Rod Smith, Jasim Uddin, Malcolm Gillies."— Presentation transcript:

1 Selection of irrigation duration for high performance furrow irrigation on cracking clay soils Rod Smith, Jasim Uddin, 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

6 Tco vs advance time to mid-way down furrow

7

8 Data for 4 furrows x 4 irrigations

9 Example application efficiencies (%) – one field – average of four furrows IrrigationFarmer Individual Optimum (5% runoff) Set distance Guide- lines ‘Autofurrow’ (5% runoff) Mean

10 Application efficiencies (%) – single furrows FurrowFarmerOptimum Set distance Guidelines # # # *74.0 # *79.6 # # Ba85.8* *77.7 By F K * * advance did not reach end of field

11 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

12 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


Download ppt "Selection of irrigation duration for high performance furrow irrigation on cracking clay soils Rod Smith, Jasim Uddin, Malcolm Gillies."

Similar presentations


Ads by Google