A Importância Do Uso Da Dose Correta Na Adubação Nitrogenada De Tifton 85

Patzlaff, Nédio Luís; Zulpo, Alisson Perin; Rossi, Danieli Simonetti

doi:10.30945/rcr-v22i2.3256

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…Agrár. Londrina, v. 42, n. 6, suplemento 2, p. 4085-4102, 2021 responsiveness of grass, in addition to not providing increases in production, not differing from the doses considered ideal, can lead to a decrease in productivity and, consequently, economic losses to the system (Patzlaff, Zulpo, & Rossi, 2020;Castagnara et al, 2011) Therefore, the use of doses that exceed the forage response potential leads to waste of fertilizer and, consequently, economic losses to the system, in addition to potential environmental losses caused by nitrate leaching (Rambo, Silva, Argenta, & Bayer, 2004). According to Ryan et al (2011), animal nutrition is related to rational management of N for forage production, which can reduce the environmental and financial impact.…”

Section: Results E Discussionmentioning

confidence: 99%

Mombaça grass yield as a function of nitrogen fertilization based on the use of the chlorophyll meter

Backes¹,

Godoy²,

Santos³

et al. 2021

Semina: Ciênc. Agrár.

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The objective of this study was to evaluate the yield and agronomic efficiency of mombaça grass achieved with the management of nitrogen fertilization, based on the nitrogen sufficiency index (NSI) calculated using measurements obtained with a chlorophyll meter. The experiment was conducted in the field, in São Luís de Montes Belos - GO, Brazil, from November 2016 to May 2018, as a randomized-block design with six treatments and five replicates. Treatments consisted of six N fertilization management strategies (M), namely, M1 - reference, with 150 kg ha-1 N per application; M2 - recommended, with 50 kg ha-1 N per application; M3 - 50 kg ha-1 N when NSI < 98%; M4 - 50 kg ha-1 N when NSI < 94%; M5 - 50 kg ha-1 N when NSI < 90%; and M6 - control treatment, without N application. The NSI was monitored based on the relative chlorophyll content obtained with the chlorophyll meter. Forage canopy height, tiller density, and yield were evaluated. At the end of the 2nd cycle, the recommended, reference, NSI98%, NSI94%, and NSI90% treatments had received 1,050, 350, 300, 250, and 0 kg N ha-1. Control treatment obtained the lowest dry biomass yield, whereas the recommended, NSI98%, and NSI94% treatments showed the highest. Thus, N doses between 1,950 and 300 kg ha-1, in the second cycle, provided statistically equivalent yields in mombaça grass. Considering the DM of both evaluation cycles, the highest yield was achieved with the NSI98% and NSI94% treatments. The application of N doses of 250 to 1050 kg ha-1 provided similar yields. Therefore, the adoption of a nitrogen sufficiency index below 98% and 94% as a parameter allows a reduction and rational use of nitrogen fertilizer.

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Section: Results E Discussionmentioning

confidence: 99%

Mombaça grass yield as a function of nitrogen fertilization based on the use of the chlorophyll meter

Backes¹,

Godoy²,

Santos³

et al. 2021

Semina: Ciênc. Agrár.

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“…Andrade et al (2018) found that hay produced from Tifton 85 fertilized with 300 kg ha -1 nitrogen and harvested within 37 days resulted in higher dry matter production. Patzlaff et al (2020) concluded that doses of approximately 400 kg ha -1 allowed greater production of green mass, dry mass, and a higher forage accumulation rate for Tifton 85, compared to doses of 200 kg ha -1 .…”

Section: Characterization Of Tifton 85 Development During the Experim...mentioning

confidence: 99%

Relationship between spectral indices and quality parameters of tifton 85 forage

Souza,

Costa,

Carvalho

et al. 2024

Rev. Caatinga

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Computer vision systems can be an alternative to traditional methods of analyzing the quality of forage crops, allowing the instantaneous, non-destructive monitoring of the crop, with cost reduction. This study aimed to evaluate the quality parameters of Tifton 85 (Cynodon spp.) using digital images, relating spectral indices to the quality parameters of this forage. In the experimental area, four levels of nitrogen fertilization were applied and the analyses were made at different times after the standardization cut (14, 28, 42, and 56 days). The quality parameters evaluated were mineral matter, crude protein, and neutral detergent fiber. From images obtained in the visible (RGB) and near-infrared (RGNIR) spectral regions, spectral indices were generated. Principal component analysis was applied to summarize the information obtained by spectral indices into a single principal component (PCI). PCI associated with spectral indices was related to forage quality parameters for each cutting time using simple quadratic regression models. The relationships between mineral matter and spectral indices were variable over time. Crude protein and neutral detergent fiber showed the highest relationships with the spectral indices obtained by RGNIR images already at the initial times. Thus, although the RGB images have shown satisfactory results to obtain information about the quality of Tifton 85, the NIR band tends to increase the reliability of the relationships at early times.

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“…Estes efeitos deletérios da ausência de adubação são mais pronunciados quanto maior a exigência nutricional do capim implantado e quanto maior a taxa de lotação do sistema. Pastos não adubados adequadamente têm redução no acúmulo de forragem (Patzlaff et al, 2020) e na capacidade de suporte a cada ano. Os sinais de degradação podem ser minimizados caso o manejo seja adequado, o que demanda redução na taxa de lotação ao longo do tempo.…”

Section: Impactos Técnico-econômicos Da Adubação De Pastagem Nos Sist...unclassified

Xii Simpósio De Produção De Gado De Corte

de¹,

Matos²,

Machado³

et al. 2022

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A Importância Do Uso Da Dose Correta Na Adubação Nitrogenada De Tifton 85

Cited by 4 publications

References 5 publications

Mombaça grass yield as a function of nitrogen fertilization based on the use of the chlorophyll meter

Mombaça grass yield as a function of nitrogen fertilization based on the use of the chlorophyll meter

Relationship between spectral indices and quality parameters of tifton 85 forage

Xii Simpósio De Produção De Gado De Corte

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