Abstract
Information on nitrogen (N) fertilization of no‐till (NT) cotton ( Gossypium hirsutum L.) is needed to optimize lint yields and earliness. We evaluated five N rates and three application methods for NT cotton production on Loring silt loam (fine‐silty, mixed, active, thermic Oxyaquic Fragiudalfs) with natural winter annuals as a cover; and on Memphis silt loam (fine‐silty, mixed, active, thermic Typic Hapludalfs) having corn ( Zea mays L.) stover as a cover and on Lexington silt loam (fine‐silty, mixed, active, thermic Utlic Hapludalfs) having winter wheat ( Triticum aestivum L.) as a cover. Nitrogen rates of 0, 34, 67, 101, and 134 kg ha −1 were either broadcasted as ammonium nitrate (AN) or injected as urea–ammonium nitrate (UAN) at planting. Additional treatments included broadcasting 67 kg N ha −1 as AN at planting with either 34 or 67 kg N ha −1 banded 6 wk later. Relative to no N, broadcasting 67 kg N ha −1 as AN increased 4‐yr average NT lint yields on Loring silt loam from 739 to 1281 kg lint ha −1 and 2‐yr average yields on Lexington silt loam from 1086 to 1535 kg ha −1 . A higher N rate (101 kg N ha −1 ) was needed to increase 2‐yr average yields on Memphis silt loam from 821 to 1169 kg ha −1 . Broadcasting AN was a satisfactory placement method producing yields equal to or higher than injecting UAN or splitting AN for NT cotton produced on these loessial soils despite different covers and residues.
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Claims 4
Claim · model-written summary
Broadcasting 67 kg N ha-1 as AN increased 4-yr average NT lint yields on Loring silt loam relative to no N, from 739 to 1281 kg lint ha-1
- Taxon
- Gossypium hirsutum
Gossypium hirsutume0 - Treatment
- broadcasting 67 kg N ha −1 as ANe1
- Outcome
- NT lint yieldse1
- Direction
- increasede1
- Value
- from 739 to 1281 kg lint ha −1e1
- Comparator
- no Ne1
- Setting
- Loring silt loame1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton ( Gossypium hirsutum L.)”
e1“Relative to no N, broadcasting 67 kg N ha −1 as AN increased 4‐yr average NT lint yields on Loring silt loam from 739 to 1281 kg lint ha −1 and 2‐yr average yields on Lexington silt loam from 1086 to 1535 kg ha −1”
Claim · model-written summary
Broadcasting 67 kg N ha-1 as AN increased 2-yr average yields on Lexington silt loam relative to no N, from 1086 to 1535 kg ha-1
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Treatment
- broadcasting 67 kg N ha −1 as ANe1
- Outcome
- average yieldse1
- Direction
- increasede1
- Value
- from 1086 to 1535 kg ha −1e1
- Comparator
- no Ne1
- Setting
- Lexington silt loame1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton ( Gossypium hirsutum L.)”
e1“Relative to no N, broadcasting 67 kg N ha −1 as AN increased 4‐yr average NT lint yields on Loring silt loam from 739 to 1281 kg lint ha −1 and 2‐yr average yields on Lexington silt loam from 1086 to 1535 kg ha −1”
Claim · model-written summary
A higher N rate (101 kg N ha-1) was needed to increase 2-yr average yields on Memphis silt loam, from 821 to 1169 kg ha-1
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Treatment
- 101 kg N ha −1e2
- Outcome
- average yieldse2
- Direction
- increasee2
- Value
- from 821 to 1169 kg ha −1e2
- Setting
- Memphis silt loame2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton ( Gossypium hirsutum L.)”
e2“A higher N rate (101 kg N ha −1 ) was needed to increase 2‐yr average yields on Memphis silt loam from 821 to 1169 kg ha −1”
Claim · model-written summary
Broadcasting AN was a satisfactory placement method, giving yields equal to or higher than injecting UAN or splitting AN for no-till cotton on these loessial soils despite different covers and residues
- Taxon
- Gossypium hirsutumGossypium hirsutume0
- Treatment
- Broadcasting ANe3
- Outcome
- yieldse3
- Direction
- equal to or highere3
- Qualifier
- despite different covers and residuese3
- Comparator
- injecting UAN or splitting ANe3
- Setting
- these loessial soilse3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cotton ( Gossypium hirsutum L.)”
e3“Broadcasting AN was a satisfactory placement method producing yields equal to or higher than injecting UAN or splitting AN for NT cotton produced on these loessial soils despite different covers and residues”
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