Abstract
Sorghum is an important cereal crop, which requires high dose of nitrogen for optimum growth and productivity, specially under rainfed farming situation in tropical regions. Field experiment was conducted at Haro Sabu Agricultural Research Center during main cropping season of 2014 with an objective to investigate Nitrogen Use Efficiency (NUE) of two improved and a local sorghum cultivar in relation to graded rates of N levels and to investigate their effect on yield, N uptake and economics. The treatments comprised factorial combination of four nitrogen rates (0, 46, 92 and 138 kg N ha-1) and three sorghum genotypes (Lalo, Chemada and Local varieties) tested in a Factorial Randomized Block Design with three replications. The results revealed that there was significant effect of N rates on days to 50% flowering, days to 50% physiological maturity, Lodging percentage, leaf area at 90 and 120 DAS, leaf area index, number of green leaves plant-1, biological yield, grain yield, harvest index and nitrogen use efficiency. There was significant interaction effect of N rates and sorghum genotypes on most of parameters studied. Significantly higher grain productivity was obtained in response to the application of 92 kg N ha with Lalo variety in comparison with the rest of the genotype × N-rate combinations. Genotypic variations in N uptake, partitioning and NUE in plant parts like leaves, stems and grain were noted. Increase in the rate of applied N enhanced N uptake, nitrogen utilization efficiency, and N harvest index; while higher rates decreased N use efficiency, N uptake efficiency, N recovery efficiency, and Agronomic efficiency. Economic analysis indicated higher net return with the application of 92 kg N ha-1 and Lalo genotype accrued the highest net return and benefit: cost ratio than Local variety.
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Claims 11
Claim · model-written summary
Nitrogen rates significantly affected flowering and physiological maturity timing.
SorghumNot reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant effect of N rates on days to 50% flowering, days to 50% physiological maturity”
t0“Sorghum (Sorghum bicolor L.)”
Claim · model-written summary
Nitrogen rates significantly affected lodging, leaf area, leaf area index and green leaf number.
- Treatment
- N ratese0
- Outcome
- Lodging percentage, leaf area at 90 and 120 DAS, leaf area index, number of green leaves plant-1e0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant effect of N rates on days to 50% flowering, days to 50% physiological maturity, Lodging percentage, leaf area at 90 and 120 DAS, leaf area index, number of green leaves plant-1”
t0“Sorghum (Sorghum bicolor L.)”
Claim · model-written summary
Nitrogen rates significantly affected biological yield, grain yield and harvest index.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant effect of N rates on days to 50% flowering, days to 50% physiological maturity, Lodging percentage, leaf area at 90 and 120 DAS, leaf area index, number of green leaves plant-1, biological yield, grain yield, harvest index and nitrogen use efficiency”
t0“Sorghum (Sorghum bicolor L.)”
Claim · model-written summary
Nitrogen rates significantly affected nitrogen use efficiency.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant effect of N rates on days to 50% flowering, days to 50% physiological maturity, Lodging percentage, leaf area at 90 and 120 DAS, leaf area index, number of green leaves plant-1, biological yield, grain yield, harvest index and nitrogen use efficiency”
t0“Sorghum (Sorghum bicolor L.)”
Claim · model-written summary
Nitrogen rate and sorghum genotype interacted significantly for most measured parameters.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant interaction effect of N rates and sorghum genotypes on most of parameters studied”
Claim · model-written summary
The Lalo variety at 92 kg N ha had significantly higher grain productivity than all other genotype and nitrogen combinations.
Verbatim
e0“Significantly higher grain productivity was obtained in response to the application of 92 kg N ha with Lalo variety in comparison with the rest of the genotype × N-rate combinations”
Claim · model-written summary
Sorghum genotypes varied in nitrogen uptake, partitioning and nitrogen use efficiency among leaves, stems and grain.
Verbatim
e0“Genotypic variations in N uptake, partitioning and NUE in plant parts like leaves, stems and grain were noted”
Claim · model-written summary
Higher applied nitrogen increased nitrogen uptake, utilization efficiency and harvest index.
- Treatment
- rate of applied Ne0
- Outcome
- N uptake, nitrogen utilization efficiency, and N harvest indexe0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increase in the rate of applied N enhanced N uptake, nitrogen utilization efficiency, and N harvest index”
t0“Sorghum (Sorghum bicolor L.)”
Claim · model-written summary
Higher nitrogen rates decreased nitrogen use, uptake, recovery and agronomic efficiencies.
- Treatment
- higher ratese0
- Outcome
- N use efficiency, N uptake efficiency, N recovery efficiency, and Agronomic efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“higher rates decreased N use efficiency, N uptake efficiency, N recovery efficiency, and Agronomic efficiency”
t0“Sorghum (Sorghum bicolor L.)”
Claim · model-written summary
Applying 92 kg N ha-1 gave a higher net return.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Economic analysis indicated higher net return with the application of 92 kg N ha-1”
t0“Sorghum (Sorghum bicolor L.)”
Claim · model-written summary
Lalo had the highest net return and benefit to cost ratio compared with Local variety.
- Material
- Lalo genotypee0
- Outcome
- net return and benefit: cost ratioe0
- Direction
- higheste0
- Comparator
- Local varietye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Lalo genotype accrued the highest net return and benefit: cost ratio than Local variety”
t0“Sorghum (Sorghum bicolor L.)”
The same questions in other papers
nitrogen · yield · SorghumPositive and negative results
263 papers in the same direction as this paper · 22 in the opposite direction · 4 reporting no difference from an alternative
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