Abstract
Abstract. Seventeen field experiments were conducted on alkaline soils in eastern Australia between 1997 and 2000 to evaluate irrigated cotton response to phosphorus (P) fertilisation. Only 3 experiments demonstrated significant (P < 0.05) increases in crop P uptake or lint yield with P application. Comparison of several soil P tests revealed that Colwell (bicarbonate) P provided the best correlation with P uptake at early flowering and lint yield. Soil P may limit cotton growth where Colwell-P concentrations are <6 mg/kg. Soil P concentrations at most of the sites were well above this critical limit, so P fertiliser application was not required. Average P uptake at physiological cut-out and P removal in seed cotton was 21 and 15 kg P/ha, respectively. Apparent P fertiliser recovery was variable (0–67%) and may have contributed to the lack of response that was observed in 14 out of the 17 experiments. It is recommended that at least 40 kg P/ha be applied to soils with Colwell-P concentrations <6 mg/kg to increase soil P reserves. Application rates of at least 20 kg P/ha are recommended where Colwell-P falls between 6 and 12 mg/kg to maintain soil P fertility.
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Claims 9
Claim · model-written summary
Only three of 17 experiments showed significant increases in P uptake or lint yield after P application.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- P applicatione0
- Outcome
- crop P uptake or lint yielde0
- Direction
- increasese0
- Value
- 3 experimentse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Only 3 experiments demonstrated significant (P < 0.05) increases in crop P uptake or lint yield with P application”
Claim · model-written summary
Colwell bicarbonate P correlated best with early flowering P uptake and lint yield.
- Taxon
- cottonGossypium hirsutumt0
- Compound
- Colwell (bicarbonate) Pe0
- Outcome
- P uptake at early flowering and lint yielde0
Not reportedSettingDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Colwell (bicarbonate) P provided the best correlation with P uptake at early flowering and lint yield”
Claim · model-written summary
Soil P may limit cotton growth below a Colwell-P concentration of 6 mg/kg.
- Taxon
- cottonGossypium hirsutume0
- Compound
- Soil Pe0
- Outcome
- cotton growthe0
- Value
- <6 mg/kge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Soil P may limit cotton growth where Colwell-P concentrations are <6 mg/kg”
Claim · model-written summary
Most sites exceeded the critical Colwell-P limit, so P fertilizer was considered unnecessary.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- P fertiliser application was not requirede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Soil P concentrations at most of the sites were well above this critical limit, so P fertiliser application was not required”
Claim · model-written summary
Average P uptake at physiological cut-out was 21 kg P/ha.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- P uptake at physiological cut-oute0
- Value
- 21e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Average P uptake at physiological cut-out and P removal in seed cotton was 21 and 15 kg P/ha, respectively”
Claim · model-written summary
P removal in seed cotton averaged 15 kg P/ha.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- P removal in seed cottone0
- Value
- 15 kg P/hae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Average P uptake at physiological cut-out and P removal in seed cotton was 21 and 15 kg P/ha, respectively”
Claim · model-written summary
Apparent P fertilizer recovery varied from 0 to 67%.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- Apparent P fertiliser recoverye0
- Direction
- variablee0
- Value
- 0–67%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Apparent P fertiliser recovery was variable (0–67%)”
Claim · model-written summary
At least 40 kg P/ha was recommended where Colwell-P is below 6 mg/kg.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- at least 40 kg P/ha be appliede0
- Value
- 40 kg P/hae0
- Qualifier
- Colwell-P concentrations <6 mg/kge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“at least 40 kg P/ha be applied to soils with Colwell-P concentrations <6 mg/kg to increase soil P reserves”
Claim · model-written summary
At least 20 kg P/ha was recommended at Colwell-P levels between 6 and 12 mg/kg.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- Application rates of at least 20 kg P/hae0
- Value
- 20 kg P/hae0
- Qualifier
- Colwell-P falls between 6 and 12 mg/kge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“cotton”
e0“Application rates of at least 20 kg P/ha are recommended where Colwell-P falls between 6 and 12 mg/kg to maintain soil P fertility”
The same questions in other papers
phosphorus · quality: grain · Gossypium hirsutum (cotton)Positive and negative results
15 papers in the same direction as this paper · 7 in the opposite direction · 1 reporting no difference from an alternative
- no effect
- positive
- no effect
20 papers more in this group
See all 24 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.