Produção e composição químico-bromatológica de duas cultivares de braquiária adubadas com nitrogênio e sua relação com o índice SPAD

Maranhão, Camila Maida de Albuquerque; Silva, Cristina Cavalcante Félix da; Bonomo, Paulo; Pires, Aureliano José Vieira

doi:10.4025/actascianimsci.v31i2.4305

Cited by 26 publications

(29 citation statements)

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“…Viana et al (2014) of nitrogen, respectively, and according to Maranhão et al (2009), the chlorophyll content, in addition to indirectly measuring the nitrogen status of plants, may also be used as an indicator of the crude protein content of marandu grass. In the interaction of the cuts within each treatment, the highest values for chlorophyll index were observed in the first cut in all treatments.…”

Section: Resultsmentioning

confidence: 99%

Nutritional characteristics of marandu grass (Brachiaria brizantha cv. marandu) subjected to inoculation with associative diazotrophic bacteria

Guimarães¹,

Santos²,

Bonfim-Silva³

et al. 2016

Afr. J. Microbiol. Res.

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Due to the search for viable and cost-effective ways to provide nitrogen for forage grasses, inoculation with diazotrophs presents high potential as an alternative to plant nutrition by reducing the use of nitrogen fertilizers. The objective of this work was to evaluate the nutrition of marandu grass (Brachiaria brizantha cv. marandu) subjected to inoculation with associative diazotrophic bacteria grown in Cerrado soil (Brazilian Savanna). The experiment was conducted in a greenhouse with a completely randomized design using five treatments (three strains of associative nitrogen fixing bacteria [MTH2, MTB1 and Y2], an inoculant formed by combination of strains AbV5 and AbV6 (Azospirillum brasilense) and a control (100 mg dm -3 of N-urea]) and five replications, totaling 25 experimental units. The inoculation was performed by inserting a 5 mL aliquot of bacterial broth containing 10 9 cells mL -1 in the soil near the root system of each plant. Three cuts were made at 30, 60 and 90 days after sowing. The variables: Falker chlorophyll index, nitrogen concentration in shoots and roots and crude protein in shoots of marandu grass were evaluated. The highest values for Falker chlorophyll index, nitrogen concentration, and crude protein were observed in the three cuts in plants that received N fertilization. The MTH2 strain positively influenced the nitrogen concentration in shoots and roots, and crude protein in shoots in the first and second cuts of marandu grass, whereas in the third cut, these parameters were influenced by nitrogen fertilization. In conclusion, the inoculation with associative diazotrophic bacteria may contribute positively to the nitrogen nutrition of marandu grass.

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Section: Resultsmentioning

confidence: 99%

Nutritional characteristics of marandu grass (Brachiaria brizantha cv. marandu) subjected to inoculation with associative diazotrophic bacteria

Guimarães¹,

Santos²,

Bonfim-Silva³

et al. 2016

Afr. J. Microbiol. Res.

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“…Vitória, esta mesma elevação é menor e igual a 0,0342% (Figura 3). Avaliando a produção e composição químico-bromatológica de duas cultivares de braquiária, verificaram que houve incrementos significativos dos teores protéicos com o aumento das doses de N (Maranhão et al, 2009 Os teores de FDA constituem-se em um fator de grande importância quando se avalia a digestibilidade de um volumoso, pois à medida que se aumentam os seus valores, diminui-se a digestibilidade da MS (Branco et al, 2006). Pela interação Idade x Dose, observa-se que, na idade de 45 dias, houve um efeito quadrático do N sobre os valores de DIVMS e a dose que maximiza esta variável foi a de 313 mg/dm³ de N, correspondendo a 77,8%, ao passo que aos 65 dias detectou-se um efeito linear crescente do N sobre os coeficientes de DIVMS (Figura 6).…”

Section: Resultsunclassified

Nitrogênio e as características anatômicas, bromatológicas e agronômicas de cultivares de Brachiaria brizantha

et al. 2011

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RESUMOCom o objetivo de determinar algumas características anatômicas e físico-químicas de duas cultivares de Brachiaria brizantha, cvs. Marandu e MG-5 Vitória, colhidas aos 45 e 65 dias após o plantio, sob doses crescentes de nitrogênio (N), foi conduzido um experimento em vasos, em casa de vegetação do Departamento de Ciência do Solo da Universidade Federal de Lavras-UFLA, Lavras, MG. Foi utilizado o delineamento experimental de blocos ao acaso com os tratamentos dispostos em esquema fatorial 2x2x5, sendo dois genótipos, duas idades de corte e cinco doses de N (0, 100, 200, 300 e 400 mg/dm³), com quatro repetições, totalizando 20 tratamentos e 80 unidades experimentais (vasos). As variáveis estudadas foram: densidade de perfilhos, diâmetros polar e equatorial dos estômatos nas superfícies adaxial e abaxial das folhas, teores de PB, FDN e FDA e coeficientes de DIVMS. Os resultados obtidos permitem verificar que o aumento das doses de N influencia positivamente a produção de MS nas duas idades de corte. A idade de corte influencia o número de perfilhos, a densidade e os diâmetros polar e equatorial dos estômatos e a cv. Vitória mostra-se mais plástica nas características estomáticas comparada à cv. Marandu. As doses mais altas de N proporcionam aumentos nos teores de PB e DIVMS. Os menores intervalos entre corte proporcionam os menores teores de FDN e FDA.Termos para indexação: Digestibilidade, estômatos, Marandu, MG -5 Vitória. ABSTRACTWith the objective of determining some anatomical and physicochemical characteristics of two cultivars of Brachiaria brizantha cvs. Marandu and MG-5 Vitória, harvested at 45 and 65 days after planting under growing doses of ,nitrogen (N), an assay was conducted in pots in greenhouse of the Science Department in the Federal University of Lavras -UFLA, Lavras, MG. An experimental randomized block design with the treatments arranged in a factorial scheme 2x2x5 was used, with, two genotypes, two cutting ages and five doses of N (0, 100, 200, 300 and 400 mg/dm³) with four replicates totalizing to 20 treatments and 80 experimental units (pots). The variables studied were: tiller density, polar and equatorial diameters of stomata on the adaxial and abaxial leaf surfaces, CP, NDF and ADF contents and IVDMD coefficients. The results allow to verify that increased doses of N influences positively DM yield at the two cutting ages. The cutting age influences the number o tillers, the density and polar and equatorial diameters of stomata and the cultivar Vitória presents more plastic in the stomata characteristics compared to the cultivar Marandu. Higher doses of N cause increase in the contents of CP and IVDMD. Lower inter-curtting intervals promoted the lowest contents of NDF and ADF.

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“…Rocha et al (2005) suggested that the relative chlorophyll content may be used as an indicator of nitrogen levels in the plant, in addition to providing a good correlation with the yield of some crops, such as Mombaça grass (Manarim & Monteiro, 2003) and Aruana grass (Lavres Júnior & Monteiro, 2006). The increase in the CP contents with higher doses of N may be explained by the presence of chlorophyll molecules in protein complexes and they are produced by the plant by the chloroplasts which possess RNA, DNA and ribosomes, thus being capable of synthesizing and multiplying proteins (Maranhão et al, 2009). The positive and high correlation between these attributes is of great importance in the early diagnosis of N deficiencies, ensuring that decisions are taken in good time for possible cover applications of this nutrient.…”

Section: Resultsmentioning

confidence: 99%

Yield, chemical composition and chlorophyll relative content of Tanzania and Mombaça grasses irrigated and fertilized with nitrogen after corn intercropping

et al. 2011

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-It was evaluated the effect of the absence and of application of three nitrogen doses (50, 100 and 200 kg ha -1 of N) and four harvest times in the winter/spring season (from July to October) on dry mass yield (DMY), on the relative chlorophyll contents (ICF -leaf chlorophyll index) and on the contents of total digestible nutrients (TDN), crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF) and lignin, and their respective correlations on Tanzania and Mombaça grasses after intercrop with corn in distroferric red latosol (Oxisol) soil as well. It was used a random block design, in split-plot with four replicates. The greatest DMY occured with the increase of photoperiod (from August), neverthless responses to nitrogen fertilization over cuts difered among the grasses. In an irrigated crop-livestock integration system under cerrado conditions, it is technically feasible the establishment of Tanzania and Mombaça grass intercroped with corn at sowing or if cover nitrogen fertilization is performed because even in the abscence of nitrogen fertilization, great satisfactory quantity of forage was produced, with average DMY of 2,000 kg ha -1 per cut during the highest shortage of roughage for animals (winter/spring). Nitrogen fertilization after corn harvest increases DMY and improves bromatologic composition of the grasses, as contents of chlorophyll and CP in winter/spring is increased, besides the increase of contents of TDN and a reduction on the contents of NDF and ADF until September. Leaf chlorophyll index can be used to estimate the DMY and CP content and as a marker of the need of nitrogen fertilization of Tanzania and Mombaça grasses submitted to cutting.Key Words: crop-livestock integration, crude protein, Megathyrsus maximum, neutral and acid detergent fiber, no-tillage system, total digestible nutrients Produtividade, composição bromatológica e teor relativo de clorofila dos capins tanzânia e mombaça irrigados e adubados com nitrogênio após o consórcio com milho RESUMO -Avaliou-se o efeito da ausência e da aplicação de três doses de nitrogênio (50, 100 e 200 kg ha -1 de N) e quatro épocas de corte no inverno/primavera (julho a outubro) sobre a produtividade de massa seca (PMS), os teores relativos de clorofila (ICF -índice de clorofila foliar) e os teores de nutrientes digestíveis totais (NDT), proteína bruta (PB), fibra em detergente neutro (FDN), fibra em detergente ácido (FDA) e lignina, bem como suas respectivas correlações nos capins tanzânia e mombaça após o consórcio com milho em um Latossolo Vermelho distroférrico. O delineamento experimental utilizado foi o de blocos casualizados, em parcelas subdivididas, com quatro repetições. As maiores PMS ocorreram com o aumento do fotoperíodo (a partir de agosto), no entanto, as respostas à adubação nitrogenada ao longo dos cortes diferiram entre e dentre os capins. Em sistema de integração lavoura-pecuária irrigado sob condições de cerrado, é tecnicamente viável o estabelecimento dos capins tanzânia e mombaça em consórcio c...

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Produção e composição químico-bromatológica de duas cultivares de braquiária adubadas com nitrogênio e sua relação com o índice SPAD

Cited by 26 publications

References 1 publication

Nutritional characteristics of marandu grass (Brachiaria brizantha cv. marandu) subjected to inoculation with associative diazotrophic bacteria

Nutritional characteristics of marandu grass (Brachiaria brizantha cv. marandu) subjected to inoculation with associative diazotrophic bacteria

Nitrogênio e as características anatômicas, bromatológicas e agronômicas de cultivares de Brachiaria brizantha

Yield, chemical composition and chlorophyll relative content of Tanzania and Mombaça grasses irrigated and fertilized with nitrogen after corn intercropping

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