A suite of irrigation trials in summerfruit for yield, quality and irrigation best management practices
The Irrigation experiment at Tatura's Stonefruit Field Laboratory aims to Identify the combinations of irrigation levels and timing that will enable the late season nectarine variety September Bright to achieve maximum uniformity in fruit quality attributes.
- Nectarine cv. September Bright with Rootstock: Elberta
- Planted winter 2014 in Open Tatura tree training at a density of 2222 trees/ha
The experiment has three irrigation levels and four irrigation application timings as treatments.
The irrigation levels (% of tree evapotranspiration), applied using drip irrigation, are:
- 0: extreme deficit irrigation to impose high level of water stress
- 20 & 40: deficit irrigation to impose sever and moderate level of water stress
- 100: control irrigation, crop water requirement to maximise yield
The experiment has four irrigation application timings and likely crop responses:
- Stage I of fruit development: water stress restricts cell division, reduces fruit size and yield
- Stage II of fruit development: water stress reduces vegetative vigour
- Stage IIIa of fruit development (early): water stress reduces fruit size and yield
- Stage IIIb of fruit development (late): water stress reduces fruit size and yield
Table 1: Irrigation experimental treatments
Regulated deficit irrigation (RDI) occurs during stage 2 of development. See Graph below.
Dr Mark O'Connell discusses some of the findings from the irrigation experiment in the following video (9 min, 37 sec)
Time series videos
Every few weeks photos were taken of each experiment, and produced into a video to show the resulting growth of tree canopies and fruit development.
Photos of Nectarine, September Bright, on Open Tatura trellis, from 2015 to 2017
Plant Water Status Trial
This study aims to test plant-based sensors for their efficiency in determining nectarine water status in a modern high-density orchard.