Predição da composição química de bermudas (Cynodon spp.) pela espectroscopia de reflectância no infravermelho proximal

Fontaneli, Roberto Serena; Scheffer-Basso, Simone Meredith; Dürr, João Walter; Appelt, Jaques Valter; Bortolini, Fernanda; Haubert, Fabrício Adriano

doi:10.1590/s1516-35982004000400003

Cited by 10 publications

(17 citation statements)

References 9 publications

(6 reference statements)

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“…The contents, which were relatively high, exceeded those found by Fontaneli et al (2004) and are considered high, but were similar to those found by Ribeiro and Pereira (2010) and Quaresma et al (2011) and lower than that reported by Silva et al (2007) in Tifton 85 hay. There was no effect of N on the NDF in the four cuts (Figure 12).The NDF content of forage is what most influences consumption, and values above 600 g kg -1 may be negatively associated with forage intake (MERTENS, 1994;REZENDE et al, 2015;VAN SOEST, 1994).…”

Section: Resultssupporting

confidence: 87%

“…The values were similar to those reported by Quaresma et al (2011), who did not find differences between four cuts at 30 d intervals and N levels. Fontaneli et al (2004) found a mean value of 354.0 g kg -1 DM from three years of Tifton 85 samples from Rio Grande do Sul, measured with near infrared reflectance spectroscopy. The ADF values of this study were similar to those found by Oliveira et al (2000) in the stems of Tifton 85 at different regrowth intervals.…”

Section: Resultsmentioning

confidence: 93%

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Tifton 85 grass responses to different nitrogen levels and cutting intervals

Taffarel

Mesquita

Castagnara

et al. 2016

SCA

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The objective of this study was to evaluate the influence of five levels of N and two regrowth intervals on the structural, productive, and nutritional characteristics of Tifton 85 grass (Cynodon spp). The experiment was conducted in a hay production field at the State University of West Paraná, planted in 2004 with Cynodon spp. cv. Tifton 85. The experiment was established in a randomized block design with factorial treatments of five N fertilization amounts (0, 25, 50, 75 and 100 kg ha -1 cut -1 ) applied as urea after each cut, and two regrowth intervals (28 and 35 d), with four replicates. N application promoted changes in plant structure, such as increased canopy height, stem length, leaf elongation rate, and dry mass (DM) production. The greatest N use efficiency, considering the four harvests, occurred in the plot with 25 kg N ha -1 cut -1 at the 35-d interval, with a production of 13.79 kg DM kg -1 of N applied. A nutritional analysis indicated that 100 kg ha -1 of N cut -1 promoted higher crude protein (CP) at 28 d, with the highest concentration observed in the fourth cut (208.2 g kg -1 DM) and the lowest in the second cut (140.12 g kg -1 DM). The content average in the four cuts for CP and LIG at 28 days of regrowth was 175.85 and 104.33 kg -1 g MS and at 35 days of regrowth interval was of 164.45 and 118.65 g kg -1 DM, respectively. No differences were found between regrowth intervals in the contents of mineral matter and acid detergent fiber (ADF). Environmental factors including the wide variation in precipitation (greater than 200 mm between the peak in December 2010 and the lowest in March 2011) greatly influenced Tifton 85 grass production, affecting DM and the nutritional value of the forage in each cut. Key words: Biomass. Forage quality. Grazing. Management. Persistence. Stocking. ResumoO objetivo do trabalho foi avaliar a influência de cinco doses de nitrogênio (N) em duas idades de rebrota no capim Tifton 85 (Cynodon spp.) sobre as características estruturais, produtivas e na composição bromatológica. O experimento foi instalado no campo de produção de feno da UNIOESTE, campus de Marechal Cândido Rondon. O delineamento experimental foi em blocos casualizados em esquema fatorial 5x2, sendo cinco doses de nitrogênio (0, 25, 50, 75 e 100 kg ha -1 ) aplicados em cada corte, aplicadas na forma de uréia, duas idades de rebrota (28 e 35 dias) com quatro repetições e quatro cortes.

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Section: Resultssupporting

confidence: 87%

Section: Resultsmentioning

confidence: 93%

Tifton 85 grass responses to different nitrogen levels and cutting intervals

Taffarel

Mesquita

Castagnara

et al. 2016

SCA

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“…Data was mathematically treated by the Match program and then a regression model was fitted, having the results from the chemical analysis as independent variables and the results from the near infrared reflectance as dependent variables. The evaluation of the adjustment level was made through the determination coefficients (R 2 ) (FONTANELI et al, 2004). The accuracy (R 2 ) was elevated for CP, NDF and ADF, indicating the validity of this method to predict such parameters in grasses.…”

Section: Methodsmentioning

confidence: 99%

Dynamic of dominance, growth and bromatology ofEragrostis planaNees in secondary vegetation area

Scheffer-Basso

Cecchin

Favaretto

2016

Revista Ciência Agronômica

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-The objective of this work was to evaluate the dominance, growth and bromatology of tough lovegrass or 'annoni' grass (Eragrostis plana) in secondary vegetation area. The evaluations were carried out at 23, 45, 64, 86, 111, 132, 153, and 174 days of growth after a mowing. The tough lovegrass was the dominant species on the area, accounting for 76 to 90% of biomass. There was a linear increase for leaf (9.8 kg DM ha -1 day -1) and total dry mass (16.9 kg DM ha -1 day -1) of the tough lovegrass. During the 111 days of the vegetative stage, the biomass was composed only of leaves, and the flowering started at 132 days. At 174 days, the tough lovegrass accumulated about 4,000 kg DM ha -1 , 650 kg DM ha -1 of which was composed of inflorescences. The growth analysis revealed a specific leaf area of 72 cm 2 g -1 and a maximum leaf area index of 2.1. The leaf area ratio decreased from 72.2 to 43.9 cm² g -1 between the 23 rd and 174 th days. The bromatological analysis showed a high content of neutral detergent fiber (85.3-90.4%) and acid detergent fiber (39.4-42.8%), as well as low crude protein content (3.9-9.9%), indicating the low forage quality of the species. entre o 23º e o 174º dia após o corte. A análise bromatológica mostrou elevados teores de fibra em detergente neutro (85,3-90,4%) e fibra em detergente ácido (39,4-42,8%), e baixo teor de proteína bruta (3,9-9,9%), indicando a baixa qualidade nutricional do capim-annoni.Palavras-chave: Fibra. Índice de área foliar. Massa seca. Proteína bruta. Razão de área foliar.

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“…To evaluate the chemical composition, three leaf samples were taken in the same plots used to obtain the leaf samples for anatomical study. The samples were dried at 60ºC for 72h, weighted, ground before passing through a 1mm screen and analyzed for percentage of CP, ADF, NDF and hemicellulose (HC) by near-infrared spectroscopy (NIRS), using the usual calibration method described by FONTANELI et al (2004). The HC content was determined by difference between these two fractions ( VAN SOEST et al, 1991).…”

Section: Methodsmentioning

confidence: 99%

Leaf tissues proportion and chemical composition of Axonopus jesuiticus x A. scoparius as a function of pig slurry application

et al. 2013

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This study aimed to evaluate the chemical and anatomical attributes of leaves of giant missionary grass to application of 0, 62, 124, 186, 248 and 310m³ ha-1 of pig slurry. At 83 days after the last application of fertilizer, the leaf blades were collected, fixed in FAA 70%, sectioned, stained, photographed and digitalized. The transversal section of leaf blades were evaluated for proportion of epidermis, lignified vascular tissue + sclerenchyma, non-lignified vascular tissue and parenchyma with an image-processing system calibrated to 1mm pixel-1. Leaf samples were analyzed for crude protein, acid detergent fiber, neutral detergent fiber and hemicellulose content by near infrared reflectance spectroscopy. The pig slurry application up to 310m³ ha-1 significantly increased the percentage of crude protein, parenchyma, epidermis, non-lignified vascular tissue and hemicellulose, while decreasing the percentage of acid detergent fiber and lignified vascular tissue + sclerenchyma. The Pearson's correlation was positive between crude protein and non-lignified vascular tissue, and between acid detergent fiber and lignified vascular tissue + sclerenchyma. The percentage of hemicellulose was positively correlated with epidermis, parenchyma and non-lignified vascular tissue. A negative correlation between acid detergent fiber and epidermis, parenchyma and non-lignified vascular tissue was observed.

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Predição da composição química de bermudas (Cynodon spp.) pela espectroscopia de reflectância no infravermelho proximal

Cited by 10 publications

References 9 publications

Tifton 85 grass responses to different nitrogen levels and cutting intervals

Tifton 85 grass responses to different nitrogen levels and cutting intervals

Dynamic of dominance, growth and bromatology ofEragrostis planaNees in secondary vegetation area

Leaf tissues proportion and chemical composition of Axonopus jesuiticus x A. scoparius as a function of pig slurry application

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