Abstract
Abstract Potassium (K) fertilization of cotton (Gossypium hirsutum L.) has been a major research focus the last few years throughout the cotton belt. The objective of this field research, conducted from 1991 through 1994 on two high Mehlich I extractable K (EK) soils, was to evaluate broadcast and foliar applied K for conventional‐ (CT) and no‐tillage (NT) production. Main plot broadcast K rates were 0, 28, 56, and 112 kg K ha‐1. Foliar sub‐plot treatments were a non‐foliar check, KNO3, and Ca(NO3)2. The KNO3 was applied four times per year at 4.1 kg K ha‐1 application‐1. Calcium nitrate was applied at 1.6 kg N ha‐1 to equal the N applied in the KNO3. Extractable K increased annually with broadcast K for both tillage systems and soils and was higher for NT than CT. Lint yields from CT of both soils were increased two of the eight site‐years while yields from NT were increased five of eight site‐years by broadcast K. Three of the NT site‐year yields plus four‐year mean yields of both soils were increased by applying 56 kg K ha‐1, a rate higher than currently recommended for high EK soils. Yield responses to foliar fertilization were from added N rather than the K. Petiole K levels were sufficient so that extra K applied foliarly was not recommended for either soil or tillage system.
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Claims 7
Claim · model-written summary
Broadcast potassium increased extractable soil potassium annually across both tillage systems and soils.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- broadcast Ke0
- Outcome
- Extractable Ke0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extractable K increased annually with broadcast K for both tillage systems and soils”
t0“cotton”
Claim · model-written summary
Extractable soil potassium was higher with no tillage than conventional tillage.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Extractable K increased annually with broadcast K for both tillage systems and soils and was higher for NT than CT”
t0“cotton”
Claim · model-written summary
Broadcast potassium increased lint yield under conventional tillage in two of eight site years.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- broadcast Ke0
- Outcome
- Lint yields from CTe0
- Direction
- increasede0
- Value
- two of the eight site‐yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lint yields from CT of both soils were increased two of the eight site‐years while yields from NT were increased five of eight site‐years by broadcast K”
t0“cotton”
Claim · model-written summary
Broadcast potassium increased lint yield under no tillage in five of eight site years.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- broadcast Ke0
- Outcome
- yields from NTe0
- Direction
- increasede0
- Value
- five of eight site‐yearse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lint yields from CT of both soils were increased two of the eight site‐years while yields from NT were increased five of eight site‐years by broadcast K”
t0“cotton”
Claim · model-written summary
Applying 56 kg K ha‐1 increased three no tillage site year yields and four year mean yields on both soils.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- applying 56 kg K ha‐1e0
- Outcome
- NT site‐year yields plus four‐year mean yieldse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Three of the NT site‐year yields plus four‐year mean yields of both soils were increased by applying 56 kg K ha‐1”
t0“cotton”
Claim · model-written summary
Yield responses to foliar fertilization were attributed to added nitrogen rather than potassium.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- foliar fertilizatione0
- Outcome
- Yield responsese0
- Qualifier
- added N rather than the Ke0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Yield responses to foliar fertilization were from added N rather than the K”
t0“cotton”
Claim · model-written summary
The authors did not recommend extra foliar potassium for either soil or tillage system because petiole potassium was sufficient.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- extra K applied foliarly was not recommendede0
- Qualifier
- Petiole K levels were sufficiente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Petiole K levels were sufficient so that extra K applied foliarly was not recommended for either soil or tillage system”
t0“cotton”
The same questions in other papers
transplanting · yield · Gossypium hirsutum (cotton)Positive and negative results
38 papers in the same direction as this paper · 5 in the opposite direction · 4 reporting no difference from an alternative
- negative
- negative
- negative
44 papers more in this group
See all 48 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.