Abstract
A field experiment was conducted at the Research Farm of the College of Agriculture Jalingo, Taraba State in two planting seasons (2020 and 2021) to determine the influence of nitrogen sources and rates on nutrient concentration in leaf and nitrogen use efficiency of cotton. The experiment was a 5x4 factorial of four nitrogen sources (poultry manure, organo-mineral fertilizer, urea and NPK15:15:15) and five N rates (0, 150, 200, 250 and 300 kg/ha), laid out in a randomized complete block design (RCBD) in the field. Soil pH, organic C, N, exchangeable bases, CEC and base saturation were determined before planting. Nitrogen, K and P contents of the plant leaf increased with increasing N rate. Sources of nutrients increased the N concentration of the plant leaves. Nitrogen uptake increased with N application rate. However, at 300 kg N ha-1, N uptake decreased. Agronomic, internal use and recovery nitrogen efficiencies (aNUE, iNUE and NRE) decreased with increasing N rate. The highest value of N uptake, NRE and aNUE were obtained under NPK-treated plots, while iNUE and physiological nitrogen use efficiencies (pNUE) were at maximum under poultry manure amended plots. Cotton N use efficiency can be improved through conscientious use of fertilizers taking into consideration the soil nutrient status. Among the nitrogen sources, urea produced the lowest value for the nitrogen use efficiency of cotton. It is therefore, recommended that nitrogen dose of 150 kg/ha from either poultry manure or NPK be applied for optimum N use efficiency in the study area.
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Claims 9
Claim · model-written summary
Cotton leaf nitrogen, potassium and phosphorus contents increased with nitrogen rate.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- N ratee0
- Outcome
- Nitrogen, K and P contents of the plant leafe0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen, K and P contents of the plant leaf increased with increasing N rate”
t0“cotton”
Claim · model-written summary
Nutrient sources increased cotton leaf nitrogen concentration.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Sources of nutrientse0
- Outcome
- N concentration of the plant leavese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Sources of nutrients increased the N concentration of the plant leaves”
t0“cotton”
Claim · model-written summary
Cotton nitrogen uptake increased with nitrogen application rate.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- N application ratee0
- Outcome
- Nitrogen uptakee0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen uptake increased with N application rate”
t0“cotton”
Claim · model-written summary
At 300 kg N ha-1, cotton nitrogen uptake decreased.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- 300 kg N ha-1e0
- Outcome
- N uptakee0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“at 300 kg N ha-1, N uptake decreased”
t0“cotton”
Claim · model-written summary
Agronomic, internal use and recovery nitrogen efficiencies declined as nitrogen rate increased.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- N ratee0
- Outcome
- Agronomic, internal use and recovery nitrogen efficienciese0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Agronomic, internal use and recovery nitrogen efficiencies (aNUE, iNUE and NRE) decreased with increasing N rate”
t0“cotton”
Claim · model-written summary
NPK-treated plots had the highest cotton nitrogen uptake, recovery efficiency and agronomic efficiency.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- NPK-treated plotse0
- Outcome
- N uptake, NRE and aNUEe0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest value of N uptake, NRE and aNUE were obtained under NPK-treated plots”
t0“cotton”
Claim · model-written summary
Poultry manure plots had maximum cotton internal and physiological nitrogen use efficiencies.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- poultry manure amended plotse0
- Outcome
- iNUE and physiological nitrogen use efficiencies (pNUE)e0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“iNUE and physiological nitrogen use efficiencies (pNUE) were at maximum under poultry manure amended plots”
t0“cotton”
Claim · model-written summary
Urea gave the lowest cotton nitrogen use efficiency among nitrogen sources.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- ureae0
- Outcome
- nitrogen use efficiency of cottone0
- Direction
- loweste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“urea produced the lowest value for the nitrogen use efficiency of cotton”
Claim · model-written summary
The authors recommend 150 kg/ha nitrogen from poultry manure or NPK for optimum nitrogen use efficiency in the study area.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- nitrogen dose of 150 kg/ha from either poultry manure or NPKe0
- Outcome
- optimum N use efficiencye0
- Setting
- the study areae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“recommended that nitrogen dose of 150 kg/ha from either poultry manure or NPK be applied for optimum N use efficiency in the study area”
t0“cotton”