Abstract
To-date, assessments of nitrogen use efficiency (NUE) of sugarcane have not included the contribution of its components, nitrogen uptake efficiency (NUpE) and nitrogen utilization efficiency (NUtE). This study determined these values, based on biomass and plant nitrogen (N) content, in two four-month-old pot-grown genotypes. The treatments included six N regimes, with nitrate (NO3—N) or ammonium (NH4+-N) supplied alone, or as NO3−-N for the first 6 weeks and then NH4+-N until harvest, each as 4 or 20 mM. Regardless of the N form, NUE was higher at four than at 20 mM due to significantly higher NUpE at low N supply. The results indicated that there was luxury N uptake and preference for NH4+-N nutrition, which resulted in the highest determined NUE. There were significant differences between genotypes in biomass, morphological growth parameters, N uptake, total plant N and NUE, the latter matching previously established sucrose yield-based NUE field rankings.
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Claims 7
Claim · model-written summary
Sugarcane NUE was higher at 4 than 20 mM nitrogen regardless of form.
Verbatim
e0“Regardless of the N form, NUE was higher at four than at 20 mM”
t0“sugarcane grown in pots”
Claim · model-written summary
Nitrogen uptake efficiency was significantly higher at low N supply.
Not reportedComparator
Verbatim
e0“significantly higher NUpE at low N supply”
t0“sugarcane”
Claim · model-written summary
The study found luxury nitrogen uptake in sugarcane.
Verbatim
e0“there was luxury N uptake”
t0“sugarcane”
Claim · model-written summary
Sugarcane preferred NH4+-N nutrition, which produced the highest NUE.
Not reportedComparator
Verbatim
e0“preference for NH4+-N nutrition, which resulted in the highest determined NUE”
t0“sugarcane”
Claim · model-written summary
Sugarcane genotypes differed significantly in biomass and morphological growth parameters.
Not reportedDirection
Verbatim
e0“significant differences between genotypes in biomass, morphological growth parameters”
t0“sugarcane”
Claim · model-written summary
Sugarcane genotypes differed significantly in N uptake, total plant N and NUE.
Not reportedDirection
Verbatim
e0“significant differences between genotypes in biomass, morphological growth parameters, N uptake, total plant N and NUE”
t0“sugarcane”
Claim · model-written summary
Genotype rankings for pot NUE matched earlier field rankings based on sucrose yield.
Verbatim
e0“the latter matching previously established sucrose yield-based NUE field rankings”
t0“sugarcane”
The same questions in other papers
nitrogen · nutrient: efficiency · Saccharum officinarum (sugarcane)Positive and negative results
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This paper is about lacking the nutrient, so it counts the other way round here.
- positive
- positive
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See all 11 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.