Abstract
The low effectiveness of nitrogen fertilizer (N) is a substantial concern that threatens global sugarcane production. The aim of the research reported in this paper was to assess the residual effect of N-fertilizer applied at sugarcane planting over four crop seasons in relation to sugarcane crop yield. Toward this end three field experiments were established in the state of São Paulo, Brazil, during February of 2005 and July of 2009, in a randomized block design with four treatments: 0, 40, 80 and 120 kg ha−1 of N applied as urea during sugarcane planting. Within each plot, a microplot was established to which 15N-labeled urea was applied. The application of N at planting increased plant cane yield in two of the three sites and sucrose content at the other, whereas the only residual effect was higher sucrose content in one of the following ratoons. The combined effect was an increase in sugar yield for three of the 11 crop seasons evaluated. Over the crop cycle of a plant cane and three ratoon crops, only 35 % of the applied N was recovered, split 75, 13, 7 and 5 % in the plant cane, first, second and third ratoons, respectively. These findings document the low efficiency of N recovery by sugarcane, which increases the risk that excessive N fertilization will reduce profitability and have an adverse effect on the environment.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 9
Claim · model-written summary
Planting nitrogen increased plant cane yield at two of three sites.
- Taxon
- sugarcanet0
- Treatment
- application of N at plantinge0
- Outcome
- plant cane yielde0
- Direction
- increasede0
- Qualifier
- two of the three sitese0
Not reportedComparator
Verbatim
t0“sugarcane”
e0“The application of N at planting increased plant cane yield in two of the three sites”
Claim · model-written summary
Planting nitrogen increased sucrose content at the third site.
- Taxon
- sugarcanet0
- Treatment
- application of N at plantinge0
- Outcome
- sucrose contente0
- Direction
- increasede0
- Qualifier
- at the othere0
Not reportedComparator
Verbatim
t0“sugarcane”
e0“The application of N at planting increased plant cane yield in two of the three sites and sucrose content at the other”
Claim · model-written summary
The only residual effect was higher sucrose content in one ratoon.
Not reportedTreatmentComparator
Verbatim
t0“sugarcane”
e0“the only residual effect was higher sucrose content in one of the following ratoons.”
Claim · model-written summary
Nitrogen application increased sugar yield in three of eleven crop seasons.
Not reportedTreatmentComparator
Verbatim
t0“sugarcane”
e0“The combined effect was an increase in sugar yield for three of the 11 crop seasons evaluated.”
Claim · model-written summary
Across plant cane and three ratoons, 35% of applied nitrogen was recovered.
Verbatim
t0“sugarcane”
e0“Over the crop cycle of a plant cane and three ratoon crops, only 35 % of the applied N was recovered, split 75, 13, 7 and 5 % in the plant cane, first, second and third ratoons, respectively.”
Claim · model-written summary
Plant cane accounted for 75% of recovered nitrogen.
Verbatim
t0“sugarcane”
e0“split 75, 13, 7 and 5 % in the plant cane, first, second and third ratoons, respectively.”
Claim · model-written summary
First ratoon accounted for 13% of recovered nitrogen.
Verbatim
t0“sugarcane”
e0“split 75, 13, 7 and 5 % in the plant cane, first, second and third ratoons, respectively.”
Claim · model-written summary
Second ratoon accounted for 7% of recovered nitrogen.
Verbatim
t0“sugarcane”
e0“split 75, 13, 7 and 5 % in the plant cane, first, second and third ratoons, respectively.”
Claim · model-written summary
Third ratoon accounted for 5% of recovered nitrogen.
Verbatim
t0“sugarcane”
e0“split 75, 13, 7 and 5 % in the plant cane, first, second and third ratoons, respectively.”
The same questions in other papers
nitrogen · yield · Saccharum officinarum (sugarcane)Results differ
117 papers in the same direction as this paper · 15 in the opposite direction · 4 reporting no difference from an alternative
- negative
- no effect
- positive
133 papers more in this group
See all 137 papers →nitrogen · quality: sugar starch · Saccharum officinarum (sugarcane)Positive and negative results
31 papers in the same direction as this paper · 8 in the opposite direction
- positive
- negative
- negative
36 papers more in this group
See all 40 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.