Abstract
The ability to select grain sorghum genotypes for efficient utilization of N would lead to incorporation of high N efficiency in commercial hybrids and a better understanding of plant N metabolism. Field and greenhouse studies were conducted on plant utilization of absorbed N to identify genotypic differences in N use efficiency, examine parental influence on hybrid performance, and determine the effects of N fertility and irrigation on hybrid N efficiency. Hybrids were tested as seedlings in the greenhouse to identify morphological or physiological characteristics associated with their N utilization efficiency at maturity. Hybrid efficiency of N utilization was evaluated by the ratios of plant dry weight to the amount or concentration of N in the plant. In a field experiment, 36 F1 hybrids produced from six female and six male inbreds were grown under dryland or irrigated conditions with zero or 112 kg N/ha. At physiological maturity, the aboveground dry matter of plot subsamples were analyzed for reduced N. Significant differences were found among the hybrids and their common parent averages for each of the N use efficiency variables. Irrigation had little effect on hybrid efficiency of N utilization and produced no significant change in the relationship among hybrids for N efficiency. The range of N efficiency values was larger, and hybrids utilized N more efficiently in the zero N treatment. Significant hybrid x N fertility interactions occurred for each of the N efficiency variables. In the greenhouse experiments, plants were grown in nutrient solutions with different growth-limiting supplies of N. Two hybrids that differed widely in N use efficiency at maturity were compared for seedling efficiency of N utilization. Plants were harvested after they exhausted solution N supplies and divided into shoot and root samples which were analyzed for reduced N. Hybrid differences for N use efficiency measured at maturity in field experiments were not detected in the seedling stage. None of the traits measured, including pattern of fresh weight accumulation, predicted the N utilization efficiency of mature plants.
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Claims 8
Claim · model-written summary
Sorghum hybrids and their common-parent averages differed significantly for each nitrogen-use-efficiency variable.
- Taxon
- GRAIN SORGHUM
Sorghum bicolort0 - Material
- hybridse0
- Outcome
- N use efficiency variablese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences were found among the hybrids and their common parent averages for each of the N use efficiency variables.”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
Claim · model-written summary
Irrigation had little effect on hybrid nitrogen-use efficiency.
- Taxon
- GRAIN SORGHUMSorghum bicolort0
- Treatment
- Irrigatione0
- Outcome
- hybrid efficiency of N utilizatione0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation had little effect on hybrid efficiency of N utilization”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
Claim · model-written summary
Irrigation did not significantly change the ranking relationship among hybrids for nitrogen efficiency.
- Taxon
- GRAIN SORGHUMSorghum bicolort0
- Treatment
- Irrigatione1
- Outcome
- relationship among hybrids for N efficiencye0
- Direction
- no significant changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“produced no significant change in the relationship among hybrids for N efficiency.”
e1“Irrigation had little effect on hybrid efficiency of N utilization”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
Claim · model-written summary
The range of nitrogen-efficiency values was larger under zero nitrogen.
- Taxon
- GRAIN SORGHUMSorghum bicolort0
- Treatment
- zero N treatmente0
- Outcome
- range of N efficiency valuese0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The range of N efficiency values was larger, and hybrids utilized N more efficiently in the zero N treatment.”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
Claim · model-written summary
Hybrids used nitrogen more efficiently under zero nitrogen.
- Taxon
- GRAIN SORGHUMSorghum bicolort0
- Treatment
- zero N treatmente0
- Outcome
- Ne0
- Direction
- more efficientlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“hybrids utilized N more efficiently in the zero N treatment.”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
Claim · model-written summary
Hybrid by nitrogen-fertility interactions were significant for every nitrogen-efficiency variable.
- Taxon
- GRAIN SORGHUMSorghum bicolort0
- Material
- hybride0
- Treatment
- N fertilitye0
- Outcome
- N efficiency variablese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant hybrid x N fertility interactions occurred for each of the N efficiency variables.”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
Claim · model-written summary
Maturity-stage hybrid differences in nitrogen-use efficiency were not detected at the seedling stage.
- Taxon
- GRAIN SORGHUMSorghum bicolort0
- Organ / stage
- seedling stagee0
- Outcome
- Hybrid differences for N use efficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Hybrid differences for N use efficiency measured at maturity in field experiments were not detected in the seedling stage.”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
Claim · model-written summary
None of the measured seedling traits predicted mature-plant nitrogen-use efficiency.
- Taxon
- GRAIN SORGHUMSorghum bicolort0
- Organ / stage
- mature plantse0
- Outcome
- N utilization efficiencye0
- Qualifier
- pattern of fresh weight accumulatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“None of the traits measured, including pattern of fresh weight accumulation, predicted the N utilization efficiency of mature plants.”
t0“GRAIN SORGHUM (SORGHUM BICOLOR (L.) MOENCH)”
The same questions in other papers
nitrogen · nutrient: content · Sorghum bicolor (sorghum)Positive and negative results
3 papers in the same direction as this paper · 19 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
- positive
19 papers more in this group
See all 23 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.