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Sustainable Irrigated Landscapes - North East - Mid and Upper Goulburn Broken
Welcome to the autumn issue of IrriGate
Inside this issue
Irrigation efficiency performance - Drip | Australian Irrigation Conference | Sustainable Irrigated Landscapes Rebates | Irrigation efficiency performance - Travelling Irrigator | WTC 2010 Irrigation Expo | On-farm Efficiency Program Update | Contact Details
We are updating our address database - RMB numbers are no longer satisfactory and where properties have changed hands we do not have current or the correct information, so please check your envelope details and contact me with any changes.
Wendy Paglia - Editor
Telephone (03) 5731 1206 or firstname.lastname@example.org .
Vineyard irrigation efficiency performance
Checking the performance of your vineyard’s irrigation system can provide some useful insights or provide you some peace of mind. If you want to make your irrigation work for you it is important to confirm it is performing at an adequate level. An irrigation meter can indicate four megalitres per hectare (ML/ha) was applied, but doesn't indicate it was applied uniformly across the vineyard. Some vines could be getting fed by drippers supplying 10 litres per hour while others are only get two litres per hour, resulting in some plants becoming waterlogged, while other plants in the same vineyard are moisture stressed.
|This can be checked by measuring the flow rate of emitters at a number of locations across the vineyard and checking the ‘distribution’ or ‘dripper uniformity’. The example below (Figure 1) is where we measured this on a seven hectare (Ha) north east Victoria vineyard, irrigated with inline drippers. The flow rate of 64 drippers was measured across the block with the following results.|
The distribution uniformity was measured at 86 per cent, which is above the 75 per cent level considered adequate, a new system should be operating at 85 per cent or greater. The dripper uniformity in this case provides confidence to the vineyard manager that the vast majority of the vines are getting the same amount of water.
In this example the measurements were taken one step further by noting where in the vineyard the measurements were taken, so the map in Figure 2 can be produced to identify where across the vineyard the high or low water application is likely to occur.
This allows the vineyard manager to map where the water is being applied and it can also be used to ensure soil moisture monitoring equipment is installed in a representative area of the vineyard.
If you are interested in analysing your system or would like more information please contact a team member, contact details are on the back of the newsletter.
Figure 1: Dripper flow rates from lowest to highest
Figure 2: Dripper uniformity contour map, showing areas likely to
get higher or lower amounts of water
|Producers that have benefited from the rebate and installed some soil moisture monitoring equipment to improve their irrigation management include Rostrevor Hop Gardens, Chestnut, strawberry runner growers and several beef and dairy producers.|
TAFCO Rural Supplies have also used the rebates on behalf of North East Catchment landholders to recently purchase six weather stations. One each located at Kiewa, King and Beechworth and three in the Ovens region. The weather stations monitor conditions such as: evaporation; rainfall; wind speed and direction; humidity and frost. This information will be provided on the internet providing information for all landholders in the area.
The weather station on the Caponecchia property at Buffalo River. Back left: Connor, Damian and Fletcher. Front: Luca and Nathan.
|The distribution pattern of the travelling irrigator shown in Figure 4 was assessed under minimal wind conditions. It throws water to a radius of 37.5 metres (m) applying an average application rate of 15 millilitres (mm), with a distribution pattern shown in Figure 5. |
A distribution uniformity (DU) to aim for is greater than 75 per cent. This travelling irrigator is operating at a distribution uniformity level of 62 per cent without any `overlap. To improve this distribution uniformity some overlap should occur.
Figure 5: The distribution pattern of the system DU 62 per cent
|Current operation:This travelling irrigation system is currently operated by two runs down a paddock creating a 22 m overlap in the middle and none on the edges as shown in Figure 6. This increased the average application rate to 18 millilitres, but only increased the distribution uniformity to 64 per cent.|
Figure 6: The current operation with an overlap of 22 m in the middle DU 64 per cent
|An improved operation: A better option to improve the distribution uniformity of this travelling irrigator is to introduce a third run. In this case, to keep within the paddock boundaries a half throw could be run along the edges of the paddock and then a run straight up the middle, providing an overlap of 12.5 m. This maintains the average application at 18 mm but increases the distribution uniformity to a very respectable 84 per cent. (Figure 7). It should be noted this set up will increase the labour required by adding an extra shift.|
If you are interested in analysing your system contact one of the team members on the back of the newsletter.
Figure 7: The current operation with an overlap of 12.5 m DU 84 per cent
|Affect of wind: A frequent comment with travelling irrigators is the affect of wind and how this really changes the distribution uniformity. This same travelling irrigator (Figure 1) was tested during windy conditions. The average wind speed during this assessment was 20 kilometres an hour (km/hr), classified as moderate breeze, with average gusts up to 32 km/hr. The affect of the wind dropped the distribution uniformity to 20 per cent. The average application rate on the down wind side was 17 mm, while up wind the average was eight mm (Figure 8).|
Figure 8: The affect of a 20 km/hr wind on the distribution uniformity of a travelling irrigator
|Successful Applicants that received in-principle approval to proceed to stage 2 under the On-Farm Irrigation Efficiency Program – Round 1.|
Potential number of Irrigator sub-projects
|Australian Processing Tomato Research Council Inc.|
|South Australian Murray-Darling Basin Natural Resource Management Board|
|Lachlan Catchment Management Authority|
|Ricegrowers Association of Australia Inc.|
|Murray Irrigation Limited|
|Goulburn Broken Catchment Management Authority|
|Dennis Watson |
DPI Rutherglen Centre
(02) 6030 4567
0429 304 567
Catchment Management Officer
DPI Wangaratta Centre
(03) 5723 8671
0437 362 620
Catchment Management Officer
DPI Benalla Centre
(03) 5761 1664
0419 363 572
Project Support Officer
DPI Ovens Centre
(03) 5731 1206