Abstract
Abstract Nitrogen (N) fertilization continues to be of primary importance in the economically successful production of cotton (Gossypium hirsutum L.). Profit margins of producers might be expanded by increasing the uptake efficiency of applied N. Recently, N fertilization of crops grown in the Mississippi River Delta has been suspected to impact water quality in the Gulf of Mexico. Improving efficiency of N uptake could alleviate some environmental concerns by increasing the retention of N at the site of application. The objective of this study was to determine the impact of replacing preplant N applications with postemergent N applications on the growth and yield characteristics of cotton. Delayed applications of the recommended rate of N fertilizer (112 kg N ha−1) were tested for four years under irrigated and dry land production conditions. The N rate was applied either preplant, after crop emergence, or at first square. Further, 112 kg N ha−1 was split applied evenly at preplant + first square, and after emergence + first square. The five 112 kg ha−1 N treatments were compared to an unfertilized control. Yield tended to be maximized with N treatments that included a first square application. Yields were usually lowest in the unfertilized control and the 112 kg N ha−1 preplant treatments. Not surprisingly, both yield and plant growth was influenced more by irrigation than N fertilization. Years when drought conditions caused water stress and limited plant growth, dry land cotton had only limited response to the N fertilization treatments. Irrigated cotton responded to N treatments all years with increased growth and yield. Optimizing agronomic considerations, the best N fertilization timing was an after emergence + first square split application.
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Claims 6
Claim · model-written summary
Yield tended to be maximized with N treatments that included a first square application.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- N treatments that included a first square applicatione1
- Outcome
- Yielde1
- Direction
- maximizede1
- Qualifier
- tendede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yield, Petiole Nitrate, and Node Development Responses of Cotton”
e1“Yield tended to be maximized with N treatments that included a first square application”
Claim · model-written summary
Yield was usually lowest in the unfertilized control and the 112 kg N ha-1 preplant treatments.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- unfertilized control and the 112 kg N ha−1 preplant treatmentse2
- Outcome
- Yielde2
- Direction
- loweste2
- Qualifier
- usuallye2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yield, Petiole Nitrate, and Node Development Responses of Cotton”
e2“Yields were usually lowest in the unfertilized control and the 112 kg N ha−1 preplant treatments”
Claim · model-written summary
Yield and plant growth were influenced more by irrigation than by N fertilization.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- irrigatione3
- Outcome
- yield and plant growthe3
- Comparator
- N fertilizatione3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yield, Petiole Nitrate, and Node Development Responses of Cotton”
e3“Not surprisingly, both yield and plant growth was influenced more by irrigation than N fertilization”
Claim · model-written summary
Dry land cotton had only limited response to N fertilization treatments in years with drought conditions.
- Taxon
- cottonGossypium hirsutumt0
- Outcome
- response to the N fertilization treatmentse4
- Direction
- limitede4
- Qualifier
- Years when drought conditions caused water stresse4
- Setting
- dry lande4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yield, Petiole Nitrate, and Node Development Responses of Cotton”
e4“Years when drought conditions caused water stress and limited plant growth, dry land cotton had only limited response to the N fertilization treatments”
Claim · model-written summary
Irrigated cotton responded to N treatments in all years with increased growth and yield.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- N treatmentse5
- Outcome
- growth and yielde5
- Direction
- increasede5
- Qualifier
- all yearse5
- Setting
- Irrigatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yield, Petiole Nitrate, and Node Development Responses of Cotton”
e5“Irrigated cotton responded to N treatments all years with increased growth and yield”
Claim · model-written summary
The best N fertilization timing was an after-emergence plus first-square split application.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- after emergence + first square split applicatione6
- Outcome
- N fertilization timinge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Yield, Petiole Nitrate, and Node Development Responses of Cotton”
e6“the best N fertilization timing was an after emergence + first square split application”
The same questions in other papers
nitrogen · yield · Gossypium hirsutum (cotton)Positive and negative results
285 papers in the same direction as this paper · 53 in the opposite direction · 4 reporting no difference from an alternative
- positive
- positive
- positive
339 papers more in this group
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.