Abstract
Abstract Nitrogen fertilization can improve the chemical composition of tropical forages, as nitrogen is required at all stages of plant development. The aim of this study was to verify the chemical composition of Urochloa brizantha cv. marandu fertilized with different sources of nitrogen fertilizers from the following treatments: without nitrogen fertilization (CO), fertilization with urea (UR), fertilization with ammonium nitrate (NI) and fertilization with ammonium sulfate (SA). The study was carried out from December 2021 to April 2022, in the cerrado biome of Brazil at the FCAV/UNESP Forage Sector, Jaboticabal Campus, during the rearing phase of Nelore cattle, non-castrated males kept on pasture, managed in a continuous stocking system and variable load capacity. In treatments with fertilization, 150 kg of N· ha-1 were applied, divided into 3 applications. The design used was in randomized blocks (DBC). The evaluation of the chemical composition of the forage was carried out from collections every 28 days of samples of the fraction of the forage consumed by the animals through the hand-plucking method. The samples were dried at 55ºC for 72 hours and ground in a Willey mill, with a 1 mm mesh sieve. The chemical composition of the forage was estimated by spectroscopy in the near infrared light region, NIRS (Near Infrared Spectrometer), using a modular FT-NIR spectrometer. The data obtained were submitted to ANOVA and Tukey's test (P ≤ 0.05), using the statistical program R, version 3.4.4. Nitrogen fertilization significantly increased the organic matter content of the forage (P = 0.001). The organic matter content of the non-fertilized treatment was 91.97%, while the average of the fertilized treatments was 92.22%. The percentage of crude protein in the forage also showed a significant difference (P < 0.001) between the non-fertilized treatment, which had an average of 10.64%, and the fertilized treatments, which had an average of 17.75%. The neutral detergent fiber and acid detergent fiber components also differed from the application of nitrogen fertilizer (P < 0.001) but did not differ between the types of fertilizers. The neutral detergent fiber content was significantly different (P < 0.001) between the non-fertilized treatment (59.21%) and the fertilized treatments (54.30%). The observed data for acid detergent fiber were 31.46% for the treatment without the use of fertilizers and 30.24% for the treatments with the use of fertilizers. Non-fibrous carbohydrates and liguinin components were also analyzed, but showed no difference between treatments, P = 0.078 and P = 0.209, respectively. This study confirms that the chemical composition of Urochloa brizantha cv. Marandu can be significantly improved through the application of nitrogen fertilizers. However, our results showed no significant difference between the types of fertilizers tested.
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Claims 7
Claim · model-written summary
Nitrogen fertilization increased forage organic matter from 91.97% to 92.22%.
- Taxon
- Urochloa brizantha cv. marandu
Urochloa brizanthae1 - Treatment
- Nitrogen fertilizatione0
- Outcome
- organic matter contente0
- Direction
- increasede0
- Value
- 92.22%e0
- Qualifier
- 91.97%e0
- Comparator
- non-fertilized treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen fertilization significantly increased the organic matter content of the forage (P = 0.001). The organic matter content of the non-fertilized treatment was 91.97%, while the average of the fertilized treatments was 92.22%”
e1“Urochloa brizantha cv. marandu”
Claim · model-written summary
Fertilization increased crude protein from 10.64% to 17.75%.
- Taxon
- Urochloa brizantha cv. maranduUrochloa brizanthae1
- Treatment
- fertilized treatmentse0
- Outcome
- percentage of crude proteine0
- Direction
- increaseinferrede0
- Value
- 17.75%e0
- Qualifier
- 10.64%e0
- Comparator
- non-fertilized treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The percentage of crude protein in the forage also showed a significant difference (P < 0.001) between the non-fertilized treatment, which had an average of 10.64%, and the fertilized treatments, which had an average of 17.75%”
e1“Urochloa brizantha cv. marandu”
Claim · model-written summary
Fertilization lowered neutral detergent fiber from 59.21% to 54.30%.
- Taxon
- Urochloa brizantha cv. maranduUrochloa brizanthae1
- Treatment
- fertilized treatmentse0
- Outcome
- neutral detergent fiber contente0
- Direction
- decreaseinferrede0
- Value
- 54.30%e0
- Qualifier
- 59.21%e0
- Comparator
- non-fertilized treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The neutral detergent fiber content was significantly different (P < 0.001) between the non-fertilized treatment (59.21%) and the fertilized treatments (54.30%)”
e1“Urochloa brizantha cv. marandu”
Claim · model-written summary
Fertilization lowered acid detergent fiber from 31.46% to 30.24%.
- Taxon
- Urochloa brizantha cv. maranduUrochloa brizanthae1
- Treatment
- treatments with the use of fertilizerse0
- Outcome
- acid detergent fibere0
- Direction
- decreaseinferrede0
- Value
- 30.24%e0
- Qualifier
- 31.46%e0
- Comparator
- treatment without the use of fertilizerse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The observed data for acid detergent fiber were 31.46% for the treatment without the use of fertilizers and 30.24% for the treatments with the use of fertilizers”
e1“Urochloa brizantha cv. marandu”
Claim · model-written summary
Non-fibrous carbohydrates did not differ between fertilizer treatments.
- Taxon
- Urochloa brizantha cv. maranduUrochloa brizanthae1
- Treatment
- treatmentse0
- Outcome
- Non-fibrous carbohydratese0
- Direction
- no differencee0
- Comparator
- treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-fibrous carbohydrates and liguinin components were also analyzed, but showed no difference between treatments, P = 0.078 and P = 0.209, respectively”
e1“Urochloa brizantha cv. marandu”
Claim · model-written summary
Liguinin did not differ between fertilizer treatments.
- Taxon
- Urochloa brizantha cv. maranduUrochloa brizanthae1
- Treatment
- treatmentse0
- Outcome
- liguinin componentse0
- Direction
- no differencee0
- Comparator
- treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Non-fibrous carbohydrates and liguinin components were also analyzed, but showed no difference between treatments, P = 0.078 and P = 0.209, respectively”
e1“Urochloa brizantha cv. marandu”
Claim · model-written summary
The tested nitrogen fertilizer types did not differ significantly in their effects on forage composition.
- Taxon
- Urochloa brizantha cv. maranduUrochloa brizanthae1
- Treatment
- types of fertilizers testede0
- Outcome
- difference between the types of fertilizers testede0
- Direction
- no significant differencee0
- Comparator
- types of fertilizers testede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“our results showed no significant difference between the types of fertilizers tested”
e1“Urochloa brizantha cv. marandu”
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See all 10 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.