Abstract
Context This is the first research to investigate the impact of irrigation duration on crop productivity and nitrogen (N) performance indicators in southern New South Wales (SNSW), Australia, as the industry strives for improved N productivity. Aim To benchmark the impact of different irrigation durations on waterlogging and related impacts on available soil and fertiliser N, cotton productivity and nitrogen use efficiency (NUE). Methods Two field experiments were conducted in SNSW where cotton was grown with varying rates of fertiliser N application interacting with different durations of furrow irrigation applications during the period from first flower to crop maturity. Key results Waterlogged conditions occurred within the top 20 cm of the soil profile during irrigations. These conditions coincided with fertiliser placement and high concentrations of available mineral N, which created conditions conducive for N loss. However, the internal NUE (kg lint kg crop N uptake−1) and N balance were not impacted by irrigation duration in either experiment, despite differences in duration of waterlogged conditions that averaged 15 h irrigation−1. Partial N budgets suggested that 48% of the available N to the crop could not be found in the plant or soil mineral N pools after harvest. Conclusion Modification of the duration of irrigation applications was not an effective management option to improve NUE in irrigated cotton; however, it improved water productivity (bales per megalitre). Implications Further research is required to consider the implications of other irrigation systems such as overhead sprinkler and drip systems for improvement of NUE.
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Claims 8
Claim · model-written summary
Waterlogged conditions occurred in the top 20 cm of the soil profile during irrigations in cotton.
- Taxon
- cotton
Gossypium hirsutume1 - Outcome
- Waterlogged conditionse2
- Setting
- SNSWe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two field experiments were conducted in SNSW where cotton was grown”
e2“Waterlogged conditions occurred within the top 20 cm of the soil profile during irrigations”
Claim · model-written summary
Waterlogged conditions in cotton coincided with fertiliser placement and high mineral N, creating conditions conducive for N loss.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- conditions conducive for N losse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two field experiments were conducted in SNSW where cotton was grown”
e3“conditions conducive for N loss”
Claim · model-written summary
Irrigation duration did not affect the internal NUE of cotton in either experiment.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- irrigation duratione4
- Outcome
- internal NUEe5
- Direction
- not impactede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two field experiments were conducted in SNSW where cotton was grown”
e4“and N balance were not impacted by irrigation duration in either experiment”
e5“the internal NUE”
Claim · model-written summary
Irrigation duration did not affect the N balance of cotton in either experiment.
- Taxon
- cottonGossypium hirsutume1
- Treatment
- irrigation duratione4
- Outcome
- N balancee4
- Direction
- not impactede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two field experiments were conducted in SNSW where cotton was grown”
e4“and N balance were not impacted by irrigation duration in either experiment”
Claim · model-written summary
Partial N budgets showed that 48% of the available N to the crop could not be found in the plant or soil mineral N pools after harvest.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- available N to the crope6
- Value
- 48%e6
- Qualifier
- could not be found in the plant or soil mineral N pools after harveste6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two field experiments were conducted in SNSW where cotton was grown”
e6“48% of the available N to the crop could not be found in the plant or soil mineral N pools after harvest”
Claim · model-written summary
Modifying the duration of irrigation applications was not an effective option to improve NUE in irrigated cotton.
- Taxon
- cottonGossypium hirsutume7
- Treatment
- duration of irrigation applicationse7
- Outcome
- NUEe7
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Modification of the duration of irrigation applications was not an effective management option to improve NUE in irrigated cotton; however, it improved water productivity (bales per megalitre)”
Claim · model-written summary
Modifying the duration of irrigation applications improved water productivity in cotton.
- Taxon
- cottonGossypium hirsutume7
- Treatment
- duration of irrigation applicationse7
- Outcome
- water productivitye7
- Direction
- improvede7
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“Modification of the duration of irrigation applications was not an effective management option to improve NUE in irrigated cotton; however, it improved water productivity (bales per megalitre)”
Claim · model-written summary
Waterlogged conditions averaged 15 h per irrigation in cotton.
- Taxon
- cottonGossypium hirsutume1
- Outcome
- duration of waterlogged conditionse0
- Value
- 15 he0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Two field experiments were conducted in SNSW where cotton was grown”
e0“duration of waterlogged conditions that averaged 15 h”
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See all 131 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.