Produção de seis gramíneas manejadas por corte sob efeito de diferentes lâminas de irrigação e estações anuais

Alencar, Carlos Augusto Brasileiro de; Cóser, A. C.; Oliveira, Rubens Alves de; Martins, C. E.; Cunha, Fernando França da; Figueiredo, José Luís Aguiar

doi:10.1590/s1413-70542009000500016

Cited by 5 publications

(6 citation statements)

References 7 publications

(6 reference statements)

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“…Produtividades máximas de forragem foram obtidas com aplicações de lâminas de 267 e 269 mm para o outono e o inverno, respectivamente. Tal comportamento de resposta em forrageiras foi também observado por ALENCAR et al (2009b), LOPES et al (2014) e DUPAS et al (2010.…”

Section: Resultsunclassified

“…A falta de critérios técnicos na irrigação de pastagens resulta em aplicações de água em excesso e pode causar prejuízos ao ambiente, alto consumo de energia elétrica, lixiviação de nutrientes, compactação do solo, diminuição da produtividade e vida útil da pastagem (ALENCAR et al, 2009b). Portanto, pesquisas visando a obter informações sobre o uso racional da água são de fundamental importância para a viabilização econômica e ambiental da forragicultura irrigada.…”

Section: Introductionunclassified

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Produtividade e qualidade da brachiaria irrigada no outono/inverno

et al. 2016

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RESUMO:Um dos fatores que determinam os baixos índices zootécnicos na pecuária brasileira é a estacionalidade da produção das plantas forrageiras tropicais. A irrigação pode proporcionar aumento e estabilização da produtividade durante o outono e o inverno. Objetivou-se pelo presente estudo avaliar: a) a produtividade de massa seca e qualidade de forragem de Brachiaria brizantha, em função de lâminas de irrigação, no período do outono e do inverno; b) a umidade do solo e a temperatura do ar a fim de determinar seus efeitos na produtividade de forragem. O experimento foi conduzido na Fazenda Experimental da FCAV-Unesp, em Jaboticabal-SP. Utilizou-se de um sistema de aspersão em linha para estabelecer tratamentos com cinco lâminas de irrigação correspondentes a frações da evapotranspiração de referência (L 1 = 0,18; L 2 = 0,52; L 3 = 1,00; L 4 = 1,45 e L 5 = 1,67), em duas estações do ano: outono e inverno. A produtividade de forragem foi mais elevada no outono, e a resposta de produtividade à lâmina de água foi ajustada por uma função quadrática, atingindo produtividades máximas com lâminas de 267 e 269 mm para o outono e o inverno, respectivamente. Alto valor nutritivo da forragem fo i obtido em ambas as estações do ano, com incrementos nos teores de proteína bruta com acréscimo da lâmina de irrigação somente no outono. As lâminas de água não afetaram os teores de fibra detergente neutro da forragem. PALAVRAS-CHAVE: Brachiaria brizantha, forragem, irrigação. HERBAGE YIELD AND QUALITY OF IRRIGATED BRACHIARIA IN AUTUMN AND WINTER ABSTRACT:One of the reasons of low performance of the Brazilian livestock industry include the seasonal growth of tropical pasture grasses. Irrigated grasslands may have higher and most stable rates of yield during autumn and winter seasons. Therefore, we aimed at evaluating: a) Brachiaria brizantha dry matter yield and forage quality as a function of different water depths during the autumn and winter, and b) soil moisture and air temperature effects on forage yield. The experiment was carried out at the Experimental Farm of the University of São Paulo State (FCAV -UNESP), campus in Jaboticabal -SP, Brazil. We used a line-source sprinkler system to provide five levels of irrigation (L 1 = 0.18, L 2 = 0.52, L 3 = 1.00, L 4 = 1.45, and L 5 = 1.67). These water depths corresponded to fractions of reference evapotranspiration in both autumn and winter. Forage yield was higher in autumn and water depth responses were fitted by a quadratic function, reaching maximum values at 267 and 269 mm during autumn and winter, respectively. During the autumn, we observed a highly nutritive forage with crude protein increment by increasing water depths. However, water application had no effect on neutral detergent fiber content.

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Section: Resultsunclassified

Section: Introductionunclassified

Produtividade e qualidade da brachiaria irrigada no outono/inverno

et al. 2016

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“…Grasses potentially produce high amounts of dry matter. However, biomass production is highly influenced by climatic factors, and extremely dry periods may result in substantial losses (BOTREL et al, 2002;ALENCAR et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…However, dry matter contents and concentrations of soluble carbohydrates at silage time significantly impact silage quality (SANTOS et al, 2010). As tropical grasses are perennial with a high dry matter production during the rainy season, silage lends itself as a method to minimize forage shortages during the dry season using the production surplus (ALENCAR et al, 2009;FERREIRA et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Impacts of citrus pulp addition and wilting on elephant grass silage quality

Gomes¹,

Almeida²,

Carneiro³

et al. 2017

Biosci. J.

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ABSTRACT:The objective of this work was to evaluate the use of citrus pulp addition and wilting on fermentative characteristics, chemical composition as well as gas and effluent losses of elephant grass silage. The elephant grass (70 growth days) was collected manually; one portion was immediately chopped and another one was allowed to wilt in the sun for a period of 6 h and subsequently chopped for the production of silage. Experimental PVC silos (10 cm diameter x 30 cm height) were used and sand bags were placed at the bottom of the silos. Citrus pulp (80 g kg -1 of MN) was added at the beginning of ensilage. The ensiled material was manually compressed to provide a specific mass of approximately 600 kg m -3 of silage. After 60 days, the silos were opened; gas and effluent losses were calculated and we determined pH, dry matter (DM), crude protein(CP), neutral detergent fibre (NDF), lignin, ammonia nitrogen, ash and in vitro dry matter digestibility (IVDMD). We added 0 or 80 g kg -1 of citrus pulp to wilted and un-wilted elephant grass. We used a completely randomised design with a 2 x 2 factorial arrangement (wilted or un-wilted) x (with or without citrus pulp), totalling treatments with five repetitions. Average values were compared using the F test with a probability of 5%. The addition of citrus pulp resulted in reduced levels of NDF, lignin, ash, N-NH 3 and pH and in increased values of DM and IVDMD of silages. Wilting increased the DM, NDF and lignin values and reduced the concentrations of CP, IVDMD and N-NH 3 . Based on our results, citrus pulp addition improves the chemical composition of elephant grass silage and increases its in vitro dry matter digestibility.

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“…Además de eso, las técnicas de manejo empleadas pueden influir en la dinámica de producción y uso de ese forraje (Alencar et al 2009). …”

Section: Introductionunclassified

Producción de carne en pasturas irrigadas y fertilizadas de Brachiaria híbrido cv. Mulato II en el valle del Sinú

Torregroza¹,

Reza

Suárez

et al. 2015

CTA

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Se evaluaron tres tratamientos (3, 4, 5 animales/ha), con dos repeticiones en un diseño de bloques al azar. Se determinó el rendimiento, la composición botánica y química, la degradabilidad in situ de la materia seca y la ganancia diaria de peso. La factibilidad económica se determinó mediante la relación beneficio/costo. El rendimiento de materia seca fue de 1.925,16, 1.111,18 y 884,92 kg ha -1 para los tratamientos 3, 4, 5 animales/ha, respectivamente, y se presentaron diferencias (p<0,05), mientras que la calidad de la pastura no las presentó (p>0,05). Las ganancias diarias de peso fueron de 1,07, 0,989 y 0,940 kg/animal para los tratamientos 3, 4, 5 animales/ha, respectivamente, y se presentaron diferencias (p<0,05). El tratamiento 5 animales/ha presentó los mejores indicadores económicos.Palabras claves: Brachiaria, Mulato II, producción de carne, rotación de potreros, carga animal, riego con pivote lineal AbstractThe main objective of this study was to evaluate the production of meat during the dry period in Brachiaria hybrid cv. Mulato II pasture with three stocking rates, irrigated and spring fertilized. The research was conducted for 140 days at the Center for Research Turipaná of the Colombian Corporation of Agricultural Research (Corpoica), located at Cereté, Córdoba (Colombia). Were grazed 48 cattle, commercial zebu with average weight of 339 ± 29 kg in an area of 12 hectares. Three treatments (3, 4, 5 animals/ha) were evaluated with two replications in a randomized block design. Production, chemical and botanical composition, in situ degradability of dry matter and the daily weight gain was determined. Economic feasibility was determined by the benefit/cost ratio. The dry matter production was 1.925.16, 1.111.18 and 884.92 kg ha -1 for treatments 3, 4, 5 animal/ha respectively, detected differences (p<0.05). The quality of the pasture showed no difference (p>0.05). For daily gain analysis found differences (p<0.05), with gains of 1.07, 0.989 and 0.940 kg animal for treatments 3, 4, 5 animal/ha. The treatment 5 animal/ha provided the best indicators economical.

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Produção de seis gramíneas manejadas por corte sob efeito de diferentes lâminas de irrigação e estações anuais

Cited by 5 publications

References 7 publications

Produtividade e qualidade da brachiaria irrigada no outono/inverno

Produtividade e qualidade da brachiaria irrigada no outono/inverno

Impacts of citrus pulp addition and wilting on elephant grass silage quality

Producción de carne en pasturas irrigadas y fertilizadas de Brachiaria híbrido cv. Mulato II en el valle del Sinú

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