Abstract
Abstract Yields of sugarcane (a complex hybrid of Saccharum spp .) in FL , USA , are lower on sand soils than on organic (muck) soils. Nitrogen ( N ) supply may limit sugarcane growth and yields on these sand soils. A 2‐year pot study was conducted to determine sugarcane genotypic variation in response to N rate on a sand soil. Treatments included four N rates (0, 75, 150 and 225 kg ha −1 ) and three sugarcane genotypes ( CP 80‐1743, CP 01‐2390 and TCP 87‐3388). Nitrogen fertilizer was equally split and applied at about 55 and 125 days after planting ( DAP ) for each treatment. During the experiment, the number of nodes and length of the primary stalks and tillers were recorded. Leaf relative chlorophyll (soil plant analysis development ( SPAD )) and net photosynthetic rate (Pn) were measured biweekly. All plants were harvested at 183 DAP to measure green leaf area ( GLA ), shoot biomass accumulation and partitioning, and fertilizer N use efficiency ( NUE ). Genotypes differed significantly in leaf SPAD , Pn, GLA , and shoot biomass accumulation and partitioning. CP 01‐2390 had the highest leaf Pn and shoot biomass, and CP 80‐1743 had the lowest GLA , shoot biomass and NUE among genotypes. Nitrogen rate affected leaf SPAD , GLA , shoot biomass and NUE , but had much less effect on leaf Pn. Green leaf area and biomass increased with increasing N rates. Our results suggest that a two‐pronged approach, selection of genotypes with high NUE while working to optimize N rates and delivery can improve sugarcane yields on sand soils.
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Claims 9
Claim · model-written summary
Sugarcane genotypes differed significantly in leaf SPAD, Pn and GLA.
Verbatim
e1“Genotypes differed significantly in leaf SPAD , Pn, GLA , and shoot biomass accumulation and partitioning”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Sugarcane genotypes differed significantly in shoot biomass accumulation and partitioning.
Verbatim
e1“Genotypes differed significantly in leaf SPAD , Pn, GLA , and shoot biomass accumulation and partitioning”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Genotype CP 01-2390 had the highest leaf Pn and shoot biomass.
Verbatim
e2“CP 01‐2390 had the highest leaf Pn and shoot biomass”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Genotype CP 80-1743 had the lowest GLA, shoot biomass and NUE among the genotypes.
Verbatim
e3“CP 80‐1743 had the lowest GLA , shoot biomass and NUE among genotypes”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Nitrogen rate affected leaf SPAD, GLA and shoot biomass; the direction is not stated.
Not reportedComparatorDirection
Verbatim
e4“Nitrogen rate affected leaf SPAD , GLA , shoot biomass and NUE , but had much less effect on leaf Pn”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Nitrogen rate affected fertilizer N use efficiency (NUE); the direction is not stated.
Not reportedComparatorDirection
Verbatim
e4“Nitrogen rate affected leaf SPAD , GLA , shoot biomass and NUE , but had much less effect on leaf Pn”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Nitrogen rate had much less effect on leaf Pn than on the other traits.
- Taxon
- sugarcanee7
- Treatment
- Nitrogen ratee4
- Outcome
- leaf Pne4
- Direction
- much less effecte4
- Setting
- sand soile7
Not reportedComparator
Verbatim
e4“Nitrogen rate affected leaf SPAD , GLA , shoot biomass and NUE , but had much less effect on leaf Pn”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Green leaf area and biomass increased with increasing N rates.
- Taxon
- sugarcanee7
- Treatment
- increasing N ratese5
- Outcome
- Green leaf area and biomasse5
- Direction
- increasede5
- Setting
- sand soile7
Not reportedComparator
Verbatim
e5“Green leaf area and biomass increased with increasing N rates”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
Claim · model-written summary
Selecting genotypes with high NUE while optimizing N rates and delivery can improve sugarcane yields on sand soils.
Verbatim
e6“Our results suggest that a two‐pronged approach, selection of genotypes with high NUE while working to optimize N rates and delivery can improve sugarcane yields on sand soils”
e7“to determine sugarcane genotypic variation in response to N rate on a sand soil”
The same questions in other papers
nitrogen · growth · Saccharum officinarum (sugarcane)Results differ
39 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- no effect
43 papers more in this group
See all 47 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.