Abstract
Acala ( Gossypium hirsutum L.) and Pima ( G. barbadense L.) cotton growth, lint yield, and fiber quality responses to N in the San Joaquin Valley, CA were evaluated. Numerous reasons, including adaptation of N fertilization guidelines to modern production practices, recent increases in energy costs, and growing concerns about NO − 3 contamination of ground water, led to the initiation of this study. Acala was grown for 3 yr on a Panoche clay loam [fine‐loamy, mixed (calcareous), thermic Typic Torriorthents] and a Wasco sandy loam (coarse‐loamy, mixed, nonacid, thermic Typic Torriorthents). Pima was grown for 2 yr on the Panoche clay loam. Four N treatments were established in a randomized complete block design: 56, 112, 168, and 224 kg N ha −1 . Three‐year average aboveground dry matter production of Acala was 7800 and 12 600 kg ha −1 on the Panoche clay loam and 8500 and 11 900 kg ha −1 on the Wasco sandy loam for the 56 and 168 kg N ha −1 treatments, respectively. The equivalent 2‐yr averages for Pima were 7600 (56 kg N ha −1 ) and 10 800 kg ha −1 (168 kg N ha −1 ). Linear increases in lint yield with increased N fertility level occurred for Acala on Panoche clay loam in every year. Maximum lint yield averaged over 3 yr was 1842 kg ha −1 in the 224 kg N ha −1 treatment. The response of Acala lint yield to N management on the Wasco sandy loam was smaller than on Panoche clay loam, with a maximum lint yield of 1666 kg ha −1 (224 kg N ha −1 , 3‐yr average). Pima lint yield responded to N management in a quadratic fashion with maximum yields in the 168 kg N ha −1 treatment in both years (1638 kg ha −1 , 2‐yr average). Acala gin turnouts were greater at the Panoche than at the Wasco site. Decreases in gin turnout with increasing N were significant on the Panoche clay loam (Acala and Pima) but not on the Wasco sandy loam (Acala). There was a generally positive relationship between increasing N fertilization and yield; however, efficient N management should include an assessment of available soil residual N, soil type, and yearly climatic conditions.
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Claims 9
Claim · model-written summary
Acala lint yield increased linearly with nitrogen fertility level on Panoche clay loam in every year.
- Taxon
- Acalat0
- Treatment
- increased N fertility levele1
- Outcome
- lint yielde1
- Direction
- Linear increasese1
- Setting
- Panoche clay loame1
Not reportedComparator
Verbatim
t0“Acala and Pima Cotton”
e1“Linear increases in lint yield with increased N fertility level occurred for Acala on Panoche clay loam in every year”
Claim · model-written summary
Maximum Acala lint yield averaged over three years was 1842 kg ha −1 at 224 kg N ha −1 on Panoche clay loam.
- Taxon
- Acalat0
- Treatment
- 224 kg N ha −1e2
- Outcome
- Maximum lint yielde2
- Direction
- Maximume2
- Value
- 1842 kg ha −1e2
Not reportedComparator
Verbatim
t0“Acala and Pima Cotton”
e2“Maximum lint yield averaged over 3 yr was 1842 kg ha −1 in the 224 kg N ha −1 treatment”
Claim · model-written summary
The response of Acala lint yield to N management was smaller on Wasco sandy loam than on Panoche clay loam.
Verbatim
t0“Acala and Pima Cotton”
e3“The response of Acala lint yield to N management on the Wasco sandy loam was smaller than on Panoche clay loam”
Claim · model-written summary
Maximum Acala lint yield on Wasco sandy loam was 1666 kg ha −1.
Verbatim
t0“Acala and Pima Cotton”
e3“The response of Acala lint yield to N management on the Wasco sandy loam was smaller than on Panoche clay loam”
e4“a maximum lint yield of 1666 kg ha −1”
Claim · model-written summary
Pima lint yield responded to N management in a quadratic fashion, with maximum yield at 168 kg N ha −1.
- Taxon
- Pima
.jpg?width=60)
Gossypium barbadenset0 - Treatment
- 168 kg N ha −1e5
- Outcome
- lint yielde5
- Direction
- quadratic fashione5
- Value
- 1638 kg ha −1e5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“Acala and Pima Cotton”
e5“Pima lint yield responded to N management in a quadratic fashion with maximum yields in the 168 kg N ha −1 treatment in both years (1638 kg ha −1”
Claim · model-written summary
Gin turnout of Acala and Pima decreased significantly with increasing N on Panoche clay loam.
Verbatim
t0“Acala and Pima Cotton”
e6“Decreases in gin turnout with increasing N were significant on the Panoche clay loam (Acala and Pima) but not on the Wasco sandy loam (Acala)”
Claim · model-written summary
Gin turnout of Acala did not decrease significantly with increasing N on Wasco sandy loam.
Verbatim
t0“Acala and Pima Cotton”
e6“Decreases in gin turnout with increasing N were significant on the Panoche clay loam (Acala and Pima) but not on the Wasco sandy loam (Acala)”
Claim · model-written summary
There was a generally positive relationship between increasing N fertilization and cotton yield.
Verbatim
t0“Acala and Pima Cotton”
e7“There was a generally positive relationship between increasing N fertilization and yield”
Claim · model-written summary
Efficient N management for cotton should include assessment of available soil residual N, soil type and yearly climatic conditions.
Verbatim
t0“Acala and Pima Cotton”
e0“efficient N management should include an assessment of available soil residual N, soil type, and yearly climatic conditions”
The same questions in other papers
nitrogen · quality: grain · Gossypium barbadense (Egyptian cotton)Results agree
4 papers in the same direction as this paper
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See all 5 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.