Abstract
Nitrogen fertilization is essential to raise sugarcane yield in soils deficient in N. The objective of this study was to evaluate the effect of nitrogen application in production and borer attack on sugarcane. The experiment was conducted at Escobar District, State of Paraguarí, Paraguay. Three sugarcane growing seasons were evaluated during 2011-2013. The experimental design was randomized blocks with seven treatments and three repetitions, with annual application of increasing of nitrogen (0, 30, 60, 90, 120, 150 and 180 kg ha-1). At 360 days of each crop cycle, harvest was performed with the following assessments: industrial plant height, number of internodes per plant, infestation intensity index and yield. The nitrogen rate of maximum technical efficiency and maximum economic efficiency was determined. Statistical analysis of variance, means comparison and regression were performed. Nitrogen fertilization did not affect plant height and number of internodes, but increased yield and borer attack. For every kg ha-1 of nitrogen applied 0.25 t ha-1 of yield is added, and 0.27 % of infestation intensity index increase is obtained. The rate of maximum technical efficiency was 157,4 kg N ha-1 for a yield of 73,6 t ha-1, and the rate of maximum economic efficiency was 136.5 kg N ha-1 for a yield of 88,2 t ha-1.
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Claims 5
Claim · model-written summary
Nitrogen did not affect height or internode number.
- Taxon
- sugarcanet0
- Treatment
- Nitrogen fertilizatione0
- Outcome
- plant height and number of internodese0
- Direction
- did not affecte0
Not reportedComparator
Verbatim
e0“Nitrogen fertilization did not affect plant height and number of internodes”
t0“sugarcane”
Claim · model-written summary
Nitrogen increased yield by 0.25 t ha-1 per kg ha-1 applied.
Not reportedComparator
Verbatim
e0“For every kg ha-1 of nitrogen applied 0.25 t ha-1 of yield is added”
t0“sugarcane”
Claim · model-written summary
Nitrogen increased borer infestation intensity by 0.27% per kg ha-1 applied.
- Taxon
- sugarcanet0
- Treatment
- nitrogen appliede0
- Interactor
- Diatraea saccharalis
Diatraea saccharalist0pest - Outcome
- infestation intensity indexe0
- Direction
- increasee0
- Value
- 0.27 %e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For every kg ha-1 of nitrogen applied 0.25 t ha-1 of yield is added, and 0.27 % of infestation intensity index increase is obtained”
t0“Diatraea saccharalis Fab. attack on sugarcane”
Claim · model-written summary
Maximum technical efficiency occurred at 157,4 kg N ha-1 with yield 73,6 t ha-1.
Verbatim
e0“The rate of maximum technical efficiency was 157,4 kg N ha-1 for a yield of 73,6 t ha-1”
t0“sugarcane”
Claim · model-written summary
Maximum economic efficiency occurred at 136.5 kg N ha-1 with yield 88,2 t ha-1.
Verbatim
e0“the rate of maximum economic efficiency was 136.5 kg N ha-1 for a yield of 88,2 t ha-1”
t0“sugarcane”
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