Abstract
N Fertilizer recommendations must be improved to optimize N use efficiency (NUE) for bioenergy crops. A study was conducted to test the hypothesis that sites varying in historical usage of by-product differ in soil N-supplying power and sugarcane (Saccharum spp.) responsiveness to N fertilization. Our aim was to quantify soil N availability and N fertilizer rates, sources, and application timings for their effects on sugarcane yield and NUE. Three N response trials, each involving 0 to 200 kg N ha−1, were conducted in the state of São Paulo, Brazil, at sites varying historically in the usage of vinasse. Before fertilizer application and at harvest, soil inorganic N content was quantified and potential N mineralization estimated by the Illinois Soil Nitrogen Test (ISNT); stalk yield and sugar content were measured at harvest and used to estimate NUE. Sugarcane showed significant response to N fertilization only at the sites with no history of vinasse usage. Reducing the N rate from 120 to 80 kg N ha−1 showed limited potential for lowering yield (~ 1 %), while increasing the NUE by 54 %, which was far better than the 14 % increase achieved by modifying the N source or application timing. Monitoring inorganic N and ISNT levels over time to estimate soil N-supplying power has potential for predicting the responsiveness of sugarcane to N fertilization; however, ISNT interpretations must consider factors that impede mineralization or crop N utilization, such as soil acidity or a limitation on the availability of Ca or P. Soil N testing can help optimize NUE for sustainable bioenergy production.
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Claims 6
Claim · model-written summary
Sugarcane responded significantly to nitrogen fertilization only at sites without vinasse history.
- Taxon
- Sugarcanee0
- Treatment
- N fertilizatione0
- Outcome
- responsee0
- Qualifier
- only at the sites with no history of vinasse usagee0
Not reportedComparatorDirection
Verbatim
e0“Sugarcane showed significant response to N fertilization only at the sites with no history of vinasse usage.”
Claim · model-written summary
Reducing nitrogen from 120 to 80 kg N ha−1 had limited potential to lower yield by about 1%.
- Taxon
- sugarcanet0
- Treatment
- Reducing the N rate from 120 to 80 kg N ha−1e0
- Outcome
- yielde0
- Direction
- loweringe0
- Value
- ~ 1 %e0
- Qualifier
- limited potentiale0
Not reportedComparator
Verbatim
e0“Reducing the N rate from 120 to 80 kg N ha−1 showed limited potential for lowering yield (~ 1 %)”
t0“sugarcane”
Claim · model-written summary
Reducing nitrogen from 120 to 80 kg N ha−1 increased NUE by 54%.
- Taxon
- sugarcanet0
- Treatment
- Reducing the N rate from 120 to 80 kg N ha−1e0
- Outcome
- NUEe0
- Direction
- increasinge0
- Value
- 54 %e0
Not reportedComparator
Verbatim
e0“Reducing the N rate from 120 to 80 kg N ha−1 showed limited potential for lowering yield (~ 1 %), while increasing the NUE by 54 %”
t0“sugarcane”
Claim · model-written summary
Modifying nitrogen source or application timing achieved a 14% NUE increase.
- Taxon
- sugarcanet0
- Treatment
- modifying the N source or application timinge0
- Outcome
- NUEe0
- Direction
- increasee0
- Value
- 14 %e0
Not reportedComparator
Verbatim
e0“increasing the NUE by 54 %, which was far better than the 14 % increase achieved by modifying the N source or application timing”
t0“sugarcane”
Claim · model-written summary
Monitoring inorganic nitrogen and ISNT has potential to predict sugarcane nitrogen responsiveness, with mineralization and nutrient-use constraints considered.
Verbatim
e0“Monitoring inorganic N and ISNT levels over time to estimate soil N-supplying power has potential for predicting the responsiveness of sugarcane to N fertilization; however, ISNT interpretations must consider factors that impede mineralization or crop N utilization, such as soil acidity or a limitation on the availability of Ca or P.”
Claim · model-written summary
Soil nitrogen testing can help optimize NUE for sustainable bioenergy production.
Verbatim
e0“Soil N testing can help optimize NUE for sustainable bioenergy production.”
t0“sugarcane”
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