Abstract
Summary Inadequate oxygen concentration in the root zone is a constraint to plant performance particularly in heavy, compacted and/or saline soils. Sub‐surface drip irrigation (SDI) offers a means of increasing oxygen to plant roots in such soils, provided irrigation water can be hyper‐aerated or oxygenated. Hydrogen peroxide (HP) at the rate of 5 litre ha −1 at the end of each irrigation cycle was injected through SDI tape to a field‐grown zucchini (courgette) crop ( Cucurbita pepo ) on a saturated heavy clay soil in Queensland, Australia. Fruit yield, number and shoot weight increased by 25%, 29% and 24% respectively due to HP treatment compared to the control. Two pot experiments with vegetable soybean ( Glycine max ) and cotton ( Gossypium hirsutum ) compared the effectiveness of HP and air injection using a Mazzei air injector (a venturi), throughout the irrigation cycle in raising crop yield in a heavy clay soil kept at saturation or just under field capacity. Fresh pod yield of vegetable soybean increased by 82–96% in aeration treatments compared with the control. The yield increase was associated with more pods per plant and greater mean pod weight. Significantly higher above ground biomass and light interception were evident with aeration, irrespective of soil water treatment. Similarly cotton lint yield increased by 14–28% in aeration treatments compared with the control. The higher lint yield was associated with more squares and bolls per plant which accompanied greater above ground biomass and an increase in root mass, root length and soil respiration. Air injection and HP effected greater water use, but also brought about an enhancement of water use efficiency (WUE) for pod and lint yield, and increased leaf photosynthetic rate in both species but had no effect on transpiration rate and stomatal conductance per unit leaf area. Aeration‐induced enhanced root function was arguably responsible for greater fruit set and yield in all three crops, while in vegetable soybean greater canopy cover, radiation interception and total vegetative biomass were responsible for additional yield benefit. Increased aeration of the root zone in heavy clay soils employing either air injection or HP proved beneficial to SDI irrigated crops, irrespective of the soil water conditions, and can add value to grower investments in SDI.
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Claims 16
Claim · model-written summary
Hydrogen peroxide increased zucchini fruit yield by 25%.
- Taxon
- zucchini
Cucurbita pepo subsp. pepot0 - Treatment
- HP treatmente0
- Outcome
- Fruit yielde0
- Direction
- increasede0
- Value
- 25%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit yield, number and shoot weight increased by 25%, 29% and 24% respectively due to HP treatment compared to the control”
t0“zucchini”
Claim · model-written summary
Hydrogen peroxide increased zucchini fruit number by 29%.
- Taxon
- zucchiniCucurbita pepo subsp. pepot0
- Treatment
- HP treatmente0
- Outcome
- numbere0
- Direction
- increasede0
- Value
- 29%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit yield, number and shoot weight increased by 25%, 29% and 24% respectively due to HP treatment compared to the control”
t0“zucchini”
Claim · model-written summary
Hydrogen peroxide increased zucchini shoot weight by 24%.
- Taxon
- zucchiniCucurbita pepo subsp. pepot0
- Treatment
- HP treatmente0
- Outcome
- shoot weighte0
- Direction
- increasede0
- Value
- 24%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fruit yield, number and shoot weight increased by 25%, 29% and 24% respectively due to HP treatment compared to the control”
t0“zucchini”
Claim · model-written summary
Aeration increased vegetable soybean fresh pod yield by 82–96%.
Verbatim
e0“Fresh pod yield of vegetable soybean increased by 82–96% in aeration treatments compared with the control”
Claim · model-written summary
Higher soybean pod yield was associated with more pods and greater pod weight.
Verbatim
e0“The yield increase was associated with more pods per plant and greater mean pod weight”
t0“vegetable soybean”
Claim · model-written summary
Aeration increased soybean aboveground biomass and light interception.
- Taxon
- vegetable soybeant0
- Treatment
- aeratione0
- Outcome
- above ground biomass and light interceptione0
- Direction
- highere0
Not reportedComparator
Verbatim
e0“Significantly higher above ground biomass and light interception were evident with aeration, irrespective of soil water treatment”
t0“vegetable soybean”
Claim · model-written summary
Aeration increased cotton lint yield by 14–28%.
- Taxon
- cotton
Gossypium hirsutume0 - Treatment
- aeration treatmentse0
- Outcome
- cotton lint yielde0
- Direction
- increasede0
- Value
- 14–28%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton lint yield increased by 14–28% in aeration treatments compared with the control”
Claim · model-written summary
Cotton lint yield was associated with more squares and bolls.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- squares and bolls per plante0
- Outcome
- lint yielde0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The higher lint yield was associated with more squares and bolls per plant”
t0“cotton”
Claim · model-written summary
Higher cotton lint yield accompanied greater biomass and root growth and soil respiration.
- Taxon
- cottonGossypium hirsutumt0
- Organ / stage
- roote0
- Outcome
- above ground biomasse0
- Direction
- greatere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which accompanied greater above ground biomass and an increase in root mass, root length and soil respiration”
t0“cotton”
Claim · model-written summary
Air injection and HP increased crop water use.
Not reportedComparator
Verbatim
e0“Air injection and HP effected greater water use”
t0“vegetable soybean”
Claim · model-written summary
Aeration improved water use efficiency for pod yield.
- Taxon
- vegetable soybeant0
- Treatment
- Air injection and HPt1
- Outcome
- water use efficiency (WUE) for pode0
- Direction
- enhancemente0
Not reportedComparator
Verbatim
e0“an enhancement of water use efficiency (WUE) for pod and lint yield”
t0“vegetable soybean”
t1“Air injection and HP effected greater water use”
Claim · model-written summary
Aeration improved water use efficiency for lint yield.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Air injection and HPt1
- Outcome
- water use efficiency (WUE) for pod and lint yielde0
- Direction
- enhancemente0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an enhancement of water use efficiency (WUE) for pod and lint yield”
t0“cotton”
t1“Air injection and HP effected greater water use”
Claim · model-written summary
Aeration increased leaf photosynthetic rate in soybean.
- Taxon
- vegetable soybeant0
- Treatment
- Air injection and HPt1
- Outcome
- leaf photosynthetic ratee0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“increased leaf photosynthetic rate in both species”
t0“vegetable soybean”
t1“Air injection and HP effected greater water use”
Claim · model-written summary
Aeration increased leaf photosynthetic rate in cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Air injection and HPt1
- Outcome
- leaf photosynthetic ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased leaf photosynthetic rate in both species”
t0“cotton”
t1“Air injection and HP effected greater water use”
Claim · model-written summary
Aeration did not affect leaf transpiration or stomatal conductance in soybean.
- Taxon
- vegetable soybeant0
- Treatment
- Air injection and HPt1
- Outcome
- transpiration rate and stomatal conductance per unit leaf areae0
- Direction
- no effecte0
Not reportedComparator
Verbatim
e0“had no effect on transpiration rate and stomatal conductance per unit leaf area”
t0“vegetable soybean”
t1“Air injection and HP effected greater water use”
Claim · model-written summary
Aeration did not affect leaf transpiration or stomatal conductance in cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Air injection and HPt1
- Outcome
- transpiration rate and stomatal conductance per unit leaf areae0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“had no effect on transpiration rate and stomatal conductance per unit leaf area”
t0“cotton”
t1“Air injection and HP effected greater water use”
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See all 16 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.