Aerated Water Irrigation (Oxygation) Benefits to Pineapple Yield, Water Use Efficiency and Crop Health
The peer-reviewed field research that powers our diagnostic platform.
AUTHORS
J. Dhungel, S.P. Bhattarai, D.J. Midmore
INSTITUTION
Central Queensland University, Australia
PUBLISHED IN
Advances in Horticultural Science, 2012, 26(1): 3–16
FIELD TRIAL PERIOD
2007–2011 (4 years, 2 harvest cycles)
WHAT WE FOUND
The study in plain language
Pineapple roots need oxygen to function — but drip irrigation can create waterlogged zones that starve them of it. We tested whether injecting air into the irrigation water (a technique called oxygation) could solve this problem at a commercial pineapple farm in Queensland, Australia.
Over 4 years and two full harvest cycles, we compared three treatments: aerated drip irrigation (oxygation), standard drip irrigation (control), and no irrigation at all. The results were clear — oxygation produced larger fruits, healthier roots, and less disease, while using water more efficiently.
The yield increase came from bigger individual fruits — not more fruits per plant. Root biomass nearly doubled, soil oxygen levels stayed higher, and Phytophthora (the most damaging pineapple disease in Australia) was reduced by more than 70% compared to non-irrigated crops.
This wasn't a lab experiment — it was a 2.15-hectare commercial field trial with 7 replications per treatment, analyzed over 39 months of crop growth.
KEY FINDINGS
Numbers that speak for themselves
+44%
Total Fruit Yield Increase
Oxygation increased total pineapple yield to 133.7 t/ha compared to 92.8 t/ha for the control — across both main and ratoon crops.
3%
Phytophthora with Oxygation
Phytophthora infestation dropped to just 3% of plants with aerated irrigation, compared to 4.9% (control) and 10.5% (no irrigation).
+20%
Irrigation Water Use Efficiency
IWUE increased to 52.98 t/ML with oxygation compared to 44.23 t/ML for the control — more crop per drop of water.
+79%
Root Biomass Increase
Oxygation nearly doubled root biomass (1056 vs 582 g/m²) in the main crop, driving greater nutrient uptake and plant resilience.
YIELD DATA
Fruit yield comparison (t/ha)
Combined main crop and ratoon crop yields across all treatments.
Oxygation (Aerated SDI)
Control (SDI, no aeration)
No Irrigation
Source: Table 8, Dhungel et al. (2012). Adv. Hort. Sci. 26(1): 3–16.
DISEASE MANAGEMENT
Phytophthora infestation rates
Percentage of plants showing Phytophthora symptoms (fruit and crown rot) across treatments.
3.0%
Oxygation
Lowest infestation
4.9%
Control SDI
Standard drip
10.5%
No Irrigation
Highest infestation
Why this matters: Phytophthora is one of the most costly diseases in pineapple production. Non-irrigated plants developed shallow, surface-level root systems with poor anchorage, leading to crop lodging and root damage — making them more vulnerable to infection during wet periods. Oxygation promoted deeper, healthier root systems that resisted disease even in wetter-than-average seasons (total rainfall: 4,250 mm over the trial).
Source: Table 1, Dhungel et al. (2012). P < 0.001, LSD = 1.379.
METHODOLOGY
Rigorous field trial design
This was a large-scale, multi-year commercial field trial — not a laboratory experiment.
Duration
4 years (2007–2011)
Trial Area
2.15 hectares
Replications
7 per treatment
Design
Randomized block
Crop
Pineapple (var. GC1)
Location
Yeppoon, QLD, Australia
Soil Type
Calcareous sandy loam
Aeration Method
Mazzei venturi injector (12% air by volume)
What was measured
Soil oxygen concentration (fiber-optic sensors)
Soil moisture at 10–60 cm depths
Root biomass and dry matter partitioning
Leaf gas exchange (photosynthesis, transpiration)
Canopy light interception
Leaf chlorophyll content (SPAD)
Fruit yield, size, weight, and quality
Phytophthora infestation rates
Soil compaction and bulk density
Soil microbial activity (FDA analysis)
Irrigation and gross water use efficiency
Soil chemical properties (N, P, K, pH)
ECONOMICS
The cost-benefit case for oxygation
AU$500
Add-on cost per hectare
Mazzei injector + fittings for existing SDI
AU$3,750
Additional return per hectare
From 7.5 t/ha yield gain at AU$500/t
7.5x
Return on investment
In the first crop cycle alone
Based on data from the paper's cost-benefit analysis section. SDI infrastructure lasts 15 years covering 5 crop cycles with potential additional returns of AU$18,750/ha.
FROM RESEARCH TO APPLICATION
This research is the foundation of our diagnostic platform
The oxygen stress thresholds, soil oxygen dynamics, root zone relationships, and yield response data from this study — along with over 15 years of Dr. Dhungel's broader research — are encoded into the algorithms that power every diagnostic report on Oxygen Stress.
When you run a diagnostic, you're not getting generic advice. You're getting recommendations grounded in published, peer-reviewed field data.
CITE THIS PAPER
Full citation
Dhungel, J., Bhattarai, S.P., & Midmore, D.J. (2012). Aerated water irrigation (oxygation) benefits to pineapple yield, water use efficiency and crop health. Advances in Horticultural Science, 26(1), 3–16.
Also referenced: Dhungel, J. et al. (2009). Oxygation enhanced pineapple yield and quality. Acta Horticulturae, 889, 551–556.
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