Abstract
Abstract Nitrogen management is important in determining cotton ( Gossypium hirsutum L.) yield and fiber quality. Plant tissue tests are often used to estimate cotton N status and determine if further fertilization is needed during the growing season. This study was conducted to examine the relationship between plant tissue tests of petiole NO 3 concentration and leaf N content and cotton performance as measured by vegetative growth (i.e., leaf area) and boll load. Nitrogen rates of 0, 18, 36, 72, and 144 m M N pot −1 were applied at 2‐wk intervals beginning 13 and 26 d after emergence in 1987 and 1988 through boll maturity to a greenhousegrown cultivar, Stoneville 213. The strong relationship between leaf N and leaf area and boll number ( r 2 = 0.80 and r 2 = 0.89) 1 wk after first flower appearance suggests that the transition period between vegetative and boll development is a critical time to assess cotton's N status in relation to yield. Nitrogen deficits had little effect on boll weight, boll period duration, and number of main stem nodes. Although boll weight decreased with increasing N deficit, final boll weight of the high‐N plants were within 20% of the plants receiving low N supply. The relationship between leaf N and petiole NO 3 content, was best described by Y = a + bX C ; however, with this function only one‐half of the variation in leaf N was accounted for by variation in petiole NO 3 content ( r 2 = 0.48). Leaf area and boll number were poorly correlated with petiole NO 3 content. Leaf N content was a better predictor of cotton vegetative growth (as indicated by LAI) and boll number than petiole NO 3 content, particularly when measurements are made 1 wk after first flower.
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Claims 7
Claim · model-written summary
Leaf N was strongly related to leaf area and boll number (r2 0.80 and 0.89) 1 week after first flower appearance.
- Taxon
- cotton
Gossypium hirsutume0 - Organ / stage
- 1 wk after first flower appearancee1
- Outcome
- leaf area and boll numbere1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“determining cotton ( Gossypium hirsutum L.) yield”
e1“The strong relationship between leaf N and leaf area and boll number ( r 2 = 0.80 and r 2 = 0.89) 1 wk after first flower appearance”
Claim · model-written summary
Nitrogen deficits had little effect on boll weight, boll period duration and number of main stem nodes.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- Nitrogen deficitse2
- Outcome
- boll weight, boll period duration, and number of main stem nodese2
- Direction
- no_changeinferrede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“determining cotton ( Gossypium hirsutum L.) yield”
e2“Nitrogen deficits had little effect on boll weight, boll period duration, and number of main stem nodes”
Claim · model-written summary
Boll weight decreased as N deficit increased.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- increasing N deficite3
- Outcome
- boll weighte3
- Direction
- decreasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“determining cotton ( Gossypium hirsutum L.) yield”
e3“Although boll weight decreased with increasing N deficit”
Claim · model-written summary
Final boll weight of high-N plants was within 20% of that of low-N plants.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- high‐Ne4
- Outcome
- final boll weighte4
- Direction
- no_changeinferrede4
- Value
- within 20%e4
- Comparator
- low N supplye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“determining cotton ( Gossypium hirsutum L.) yield”
e4“final boll weight of the high‐N plants were within 20% of the plants receiving low N supply”
Claim · model-written summary
Petiole NO3 content accounted for only about half of the variation in leaf N (r2 = 0.48).
- Taxon
- cottonGossypium hirsutume0
- Compound
- petiole NO 3 contente7
- Outcome
- variation in leaf Ne7
- Value
- r 2 = 0.48e7
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“determining cotton ( Gossypium hirsutum L.) yield”
e7“with this function only one‐half of the variation in leaf N was accounted for by variation in petiole NO 3 content ( r 2 = 0.48)”
Claim · model-written summary
Leaf area and boll number were poorly correlated with petiole NO3 content.
- Taxon
- cottonGossypium hirsutume0
- Compound
- petiole NO 3 contente6
- Outcome
- Leaf area and boll numbere6
- Direction
- no_changeinferrede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“determining cotton ( Gossypium hirsutum L.) yield”
e6“Leaf area and boll number were poorly correlated with petiole NO 3 content”
Claim · model-written summary
Leaf N content was a better predictor of cotton vegetative growth and boll number than petiole NO3 content.
- Taxon
- cottonGossypium hirsutume0
- Outcome
- cotton vegetative growth (as indicated by LAI) and boll numbere7
- Direction
- higherinferrede7
- Comparator
- petiole NO 3 contente7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“determining cotton ( Gossypium hirsutum L.) yield”
e7“Leaf N content was a better predictor of cotton vegetative growth (as indicated by LAI) and boll number than petiole NO 3 content”
The same questions in other papers
nitrogen · yield · Gossypium hirsutum (cotton)Positive and negative results
56 papers in the same direction as this paper · 286 in the opposite direction
- positive
- positive
- positive
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See all 343 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.