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  • 1
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    Online Resource
    Resposta da Brachiaria brizantha cv. Marandu a fertilizantes nitrogenados associados ao fosfato natural reativo
    Lepidus Tecnologia ; 2016
    In:  Comunicata Scientiae Vol. 7, No. 1 ( 2016-05-10), p. 66-
    Details
    In: Comunicata Scientiae, Lepidus Tecnologia, Vol. 7, No. 1 ( 2016-05-10), p. 66-
    Abstract: This study aimed to identify a proportion of urea and ammonium sulfate associated to natural reactive phosphate that coud maximize the production of ‘marandu’ grass in a red clayay oxisol with low phosphorus content. The experiment was conducted in a greenhouse with a completely randomized design , in split plots in the time with seven repetitions. The main plots consisted of six levels of the substitution of urea by ammonium sulfate: 0, 20, 40, 60, 80 and 100%. The split plots consisted of three growth periods, being the first 30 days after plants emergence and the others spaced 20 days after the previous evaluation. The evaluated variables were: number of tillers, SPAD value, shoot, leaf blade and stem dry mass. The ammonium sulfate can provide higher soil acidity when compared to urea, which contributes to the reactive phosphate solubilization. Ammonium sulfate increment changes the SPAD value of ‘marandu’ grass fertilized with natural reactive phosphate.
    Type of Medium: Online Resource
    ISSN: 2177-5133 , 2176-9079
    URL: Article
    DOI: 10.14295/cs.v7i1.964
    Language: Unknown
    Publisher: Lepidus Tecnologia
    Publication Date: 2016
    detail.hit.zdb_id: 2563565-7
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  • 2
    Online Resource
    Online Resource
    Marandu palisade grass intercropped with densely spaced teak in silvopastoral system
    Universidade Estadual de Londrina ; 2017
    In:  Semina: Ciências Agrárias Vol. 38, No. 4 ( 2017-08-04), p. 2075-
    Details
    In: Semina: Ciências Agrárias, Universidade Estadual de Londrina, Vol. 38, No. 4 ( 2017-08-04), p. 2075-
    Abstract: This study was conducted to evaluate two systems of production: integration between teak and forage (silvopastoral system) and forage only (monoculture). The forage species used was Marandu palisade grass (Urochloa brizantha cv. Marandu). In January 2009, part of the pasture was desiccated and the teak (Tectona grandis) was implemented in a 3 × 4 m spacing arrangement, and at every five rows, a space between rows of 6 m was established, providing a population of 750 trees per hectare. Alongside the development of the trees, the Marandu palisade grass pasture was reestablished. In February 2015, the animals were removed from the experimental area and, in March, the pasture degradation, the density and the mass of tillers was assessed. The following variables were evaluated: sward height; forage mass, percentage of leaf blade, stem+sheath and senescent material; leaf blade:stem+sheath ratio; and live:dead material ratio. The experimental design was completely randomized, with 12 replicates. Treatments consisted of two systems (silvopastoral and monoculture). The total forage accumulation was higher in the monoculture system. The sward height and the percentage of stem+sheath were higher in the integrated system, while the percentage of leaf blade and the leaf blade:stem+sheath ratio were higher in the system exclusively with forage. In conclusion, Marandu palisade grass tolerates shading in a high density spacing silvopastoral system, but the degradation process is more intense compared to grass in monoculture, and the use of Marandu palisade grass in silvopastoral systems changes the forage mass and the structure of the produced forage.
    Type of Medium: Online Resource
    ISSN: 1679-0359 , 1676-546X
    URL: Article
    DOI: 10.5433/1679-0359.2017v38n4p2075
    Language: Unknown
    Publisher: Universidade Estadual de Londrina
    Publication Date: 2017
    detail.hit.zdb_id: 2551446-5
    SSG: 22
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  • 3
    Online Resource
    Online Resource
    Energy to protein ratios in supplements for grazing heifers in the rainy season
    Springer Science and Business Media LLC ; 2019
    In:  Tropical Animal Health and Production Vol. 51, No. 8 ( 2019-11), p. 2395-2403
    Details
    In: Tropical Animal Health and Production, Springer Science and Business Media LLC, Vol. 51, No. 8 ( 2019-11), p. 2395-2403
    Type of Medium: Online Resource
    ISSN: 0049-4747 , 1573-7438
    URL: Article
    DOI: 10.1007/s11250-019-01953-8
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2005233-9
    SSG: 22
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  • 4
    Online Resource
    Online Resource
    Reactive natural phosphate and nitrogen fertilizers in Marandu grass fertilization
    Lepidus Tecnologia ; 2019
    In:  Comunicata Scientiae Vol. 9, No. 4 ( 2019-01-04), p. 729-736
    Details
    In: Comunicata Scientiae, Lepidus Tecnologia, Vol. 9, No. 4 ( 2019-01-04), p. 729-736
    Abstract: This study aimed to identify a nitrogen fertilizer in order to allow the use of reactive natural phosphate (phosphate rock) in the fertilization of Marandu grass (palisade grass cv. Marandu) in a sandy clayey Oxisol with low phosphorus content. The experiment was performed in a plant nursery at the Federal University of Mato Grosso (UFMT), in a completely randomized experimental design, in a split-plot scheme, with eight replications. The plots consisted of six fertilization treatments of the Marandu grass (Brachiaria brizantha cv. Marandu), divided into four treatments applied after liming and two treatments without liming. Treatments in the presence of liming were: single superphosphate and urea, single superphosphate and ammonium sulfate, urea and reactive natural phosphate, reactive natural phosphate and ammonium sulfate. Treatments without liming were: reactive natural phosphate and urea, reactive natural phosphate and ammonium sulfate. For this experiment, three growth times were evaluated. Ammonium sulfate allows the use of reactive natural phosphate in the fertilization of the Marandu grass even after liming, whilst urea does not provide sufficient acidity.
    Type of Medium: Online Resource
    ISSN: 2177-5133 , 2176-9079
    URL: Article
    DOI: 10.14295/cs.v9i4.1170
    Language: Unknown
    Publisher: Lepidus Tecnologia
    Publication Date: 2019
    detail.hit.zdb_id: 2563565-7
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  • 5
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    Online Resource
    Energy supplementation as strategy of pasture management
    Universidade Estadual de Maringa ; 2022
    In:  Acta Scientiarum. Animal Sciences Vol. 44 ( 2022-06-30), p. e55761-
    Details
    In: Acta Scientiarum. Animal Sciences, Universidade Estadual de Maringa, Vol. 44 ( 2022-06-30), p. e55761-
    Abstract: This study evaluated the effect of increased energy via supplementation on the performance, ingestive behavior, nutrient digestibility, and nitrogen metabolism of grazing heifers fed tropical forage in the rainy-dry transition season. Treatments consisted of mineral supplementation ad libitum (control) and multiple supplements formulated to provide different energy levels and the same amount of protein (300 g CP animal d-1) and were denominated as low (LE; 340 g TDN animal d-1), medium (ME; 780 g TDN animal d-1) and high (HE; 1220 g TDN animal d-1) energy. Animals supplemented with ME, and HE had a greater average daily gain in relation to the control treatment, with an increase of 41 and 46%, respectively. Greater values for total apparent digestibility of neutral detergent fiber were observed for the treatment HE. Lesser values of urinary urea N were observed for the control and HE treatments. Our results define the use of energy levels in the supplement as a tool for pasture management. If the purpose of the production system is to enhance forage intake, the option is to supply supplements with less energy levels. In contrast, if the purpose is to increase the stocking rate, supplements with greater energy levels should be used.
    Type of Medium: Online Resource
    ISSN: 1807-8672 , 1806-2636
    URL: Article
    DOI: 10.4025/actascianimsci.v44i1.55761
    Language: Unknown
    Publisher: Universidade Estadual de Maringa
    Publication Date: 2022
    detail.hit.zdb_id: 2555935-7
    SSG: 7,36
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  • 6
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    Nitrogênio e o potássio na adubação de manutenção de cultivares de Megathyrsus maximus
    Scientific Electronic Archives ; 2023
    In:  Scientific Electronic Archives Vol. 16, No. 10 ( 2023-09-29)
    Details
    In: Scientific Electronic Archives, Scientific Electronic Archives, Vol. 16, No. 10 ( 2023-09-29)
    Abstract: O potássio e o nitrogênio são os nutrientes mais demandados na manutenção da pastagem e, por isso, objetivou-se identificar uma combinação de nitrogênio e potássio que maximize o desenvolvimento de cultivares de Megathyrsus maximus (sin. Panicum maximum). Foram realizados quatro experimentos em casa de vegetação na Universidade Federal de Rondonópolis. Os experimentos foram realizados com os cultivares Mombaça (Experimento 1 e 2) e Zuri (Experimento 3 e 4). Para cada capim testado, realizou-se dois experimentos simultaneamente e cada experimento consistiu em duas doses de nitrogênio: 140 e 280 mg dm-3 associadas a doses de potássio. Em todos os experimentos, os tratamentos consistiram em cinco doses de potássio (0, 70, 140, 210 e 280 mg dm-3). As parcelas experimentais foram vasos de 5 dm3 e as avaliações foram realizadas quando os capins atingiram altura de 60 cm. O potássio não influenciou o número de folhas por perfilho e filocrono dos capins Mombaça e Zuri e a densidade populacional de perfilhos do capim-mombaça. Para o capim-zuri, independente da dose de nitrogênio, houve aumento da densidade populacional de perfilhos até a dose de potásiso de 70 mg dm-3. Na dose de nitrogênio de 140 mg dm-3 evidenciou-se que houve incremento na massa de forragem do capim-mombaça e zuri até as doses de potássio de 70 mg dm-3, respectivamente. Quanto a dose de nitrogênio de 280 mg dm-3, a maior massa de forragem do capim-mombaça e zuri foi observada na dose de potássio de 140 e 210 mg dm-3, respectivamente. A massa seca de cada lâmina foliar, independente do capim e da dose de nitrogênio aumentou até a dose de 70 mg dm-3. Para a adubação de cultivares de Megathyrsus maximus, a combinação de nitrogênio:potássio é aproximadamente de 1,3 a 2:1.
    Type of Medium: Online Resource
    ISSN: 2316-9281
    URL: Article
    DOI: 10.36560/161020231791
    Language: Unknown
    Publisher: Scientific Electronic Archives
    Publication Date: 2023
    detail.hit.zdb_id: 2771824-4
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  • 7
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    Online Resource
    Nitrogen fertilization time affects the root reserves of tropical grasses
    FapUNIFESP (SciELO) ; 2023
    In:  Pesquisa Agropecuária Tropical Vol. 53 ( 2023)
    Details
    In: Pesquisa Agropecuária Tropical, FapUNIFESP (SciELO), Vol. 53 ( 2023)
    Abstract: RESUMO A rebrota do capim pode reduzir a massa radicular, o que atrasa o restabelecimento e os períodos de pastejo, por reduzir a absorção de nutrientes do solo pelas plantas. Objetivou-se identificar o intervalo adequado de colheita e adubação nitrogenada para Urochloa brizantha cv. BRS Piatã e Megathyrsus maximus cv. BRS Quênia, e se a flexibilidade do momento de adubação está relacionada ao acúmulo de carboidratos solúveis em água (CS) e nitrogênio nas raízes. O experimento foi conduzido em casa-de-vegetação, em delineamento inteiramente casualizado, com cinco tratamentos [adubação nitrogenada após a colheita: 0, 2, 4, 6 e 8 dias] e dez repetições. O tempo da adubação reduziu linearmente a massa de forragem e de raízes do capim BRS Piatã, mas não afetou o BRS Quênia. Observou-se resposta quadrática sobre a concentração de CS e amido na raiz do capim BRS Piatã, diminuindo da colheita até o dia 2 e aumentando até o dia 8. Porém, com o atraso na adubação, o nitrogênio na raiz reduziu linearmente. A época de adubação nitrogenada afeta de forma quadrática a concentração de CS em raízes de capim BRS Quênia. A adubação nitrogenada do capim BRS Piatã logo após a colheita melhora a massa de forragem e de raízes, CS e reservas de nitrogênio, enquanto há maior flexibilidade quanto ao momento de realizar a adubação nitrogenada para o BRS Quênia. O intervalo entre a colheita e a adubação nitrogenada é mais dependente da massa radicular, que afeta o acúmulo de nitrogênio nas raízes.
    Type of Medium: Online Resource
    ISSN: 1983-4063 , 1517-6398
    Uniform Title: Momento de adubação nitrogenada afeta as reservas radiculares de gramíneas tropicais
    URL: Article
    DOI: 10.1590/1983-40632023v5375444
    Language: English , Portuguese
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2023
    detail.hit.zdb_id: 2251415-6
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  • 8
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    IMPACTOS TÉCNICO-ECONÔMICOS DA ADUBAÇÃO DE PASTOS
    Nativa ; 2021
    In:  Nativa Vol. 9, No. 2 ( 2021-05-14), p. 173-181
    Details
    In: Nativa, Nativa, Vol. 9, No. 2 ( 2021-05-14), p. 173-181
    Abstract: A criação de bovinos no Brasil ocorre, prioritariamente, em pastagens e, neste contexto, a adubação do pasto é uma importante estratégia de aumento na eficiência produtiva. Diante disso, objetivou-se, com esta revisão, descrever os impactos técnicos da adubação no desenvolvimento de gramíneas tropicais. A calagem é uma prática importante na disponibilidade dos nutrientes e, novos estudos visam demonstrar que o intervalo entre a incorporação do calcário e a semeadura tem maior dependência da umidade do solo e que é possível reduzir este período que tradicionalmente é de 60 a 90 dias. A adubação fosfatada tem maior impacto sobre a implantação do que a manutenção do pasto, e quando negligenciada na formação do pasto, observa-se um efeito residual sobre a rebrota. O nitrogênio e o potássio são os nutrientes mais extraídos na manutenção dos pastos, o que se torna importante o estudo da relação entre estes nutrientes, bem como a adoção da adubação potássica em sistemas em que a adubação nitrogenada é uma prática rotineira. A varredura, que consiste na mistura de sobras de fertilizantes em galpões, embora tenha baixo custo por quilo de produto, o uso pode ser antieconômico, o que depende da composição do insumo adquirido. Palavras-chave: calagem; fertilização de pastos; formação de pastagens.   Technical and economic impacts of pasture fertilization   ABSTRACT: Cattle production on Brazil priority occurs in grasslands, in this context, pasture fertilization is an important strategy to improve production efficiency. Therefore, the aim with this review is to describe the technical impacts of fertilization on tropical grass development. Liming is an important practice in nutrient availability and new studies aim to demonstrate that the interval between limestone incorporation and seeding has more dependence on soil moisture, and that is possible to reduce this period, which traditionally is from 60 to 90 days. Phosphate fertilization has a greater impact on pasture implantation than maintenance, and when neglected in pasture formation, there is a residual effect on regrowth. Nitrogen and potassium are the nutrients extracted on pasture maintenance, which makes it important to study the relationship between these nutrients, as well as the adoption of potassium fertilization in systems where nitrogen fertilization is a routine practice. Mixing leftover fertilizers in warehouses, although it has a low cost per kilo of product, the use can be uneconomical, which depends on the input composition purchased. Keywords: liming; pasture fertilization; pasture implantation.
    Type of Medium: Online Resource
    ISSN: 2318-7670
    URL: Article
    DOI: 10.31413/nativa.v9i2.12047
    Language: Unknown
    Publisher: Nativa
    Publication Date: 2021
    detail.hit.zdb_id: 2746807-0
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  • 9
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    Online Resource
    Defoliation height and potassium fertilization of Mulato II grass
    Universidade Estadual de Londrina ; 2017
    In:  Semina: Ciências Agrárias Vol. 38, No. 4Supl1 ( 2017-08-25), p. 2719-
    Details
    In: Semina: Ciências Agrárias, Universidade Estadual de Londrina, Vol. 38, No. 4Supl1 ( 2017-08-25), p. 2719-
    Abstract: A pot trial in greenhouse conditions was carried out to identify at which defoliation height Mulato II grass (Urochloa hibrida cv. Mulato II) should be managed and to determine whether potassium fertilization is necessary in soil with high potassium content. The experiment was carried out in a greenhouse in a randomized block design with six treatments and five replications. Treatments consisted of a 3 × 2 factorial arrangement, with three defoliation heights (50, 65, and 80 cm) and with or without potassium maintenance fertilization. The production characteristics and chemical composition of the forage plant were evaluated. There was no interaction effect between defoliation height and fertilization with or without potassium on any of the analyzed variables, except for mineral content in Mulato II grass. The tillers and leaves number, shoot dry matter, leaf+sheath, root system, and residue were influenced by defoliation heights and potassium fertilization, except for the leaf blades and root dry matter, leaf blade/stem+sheath ratio, and leaves number, which were not influenced by potassium fertilization. Higher shoot dry matter was observed at the heights of 65 and 80 cm; however, comparing these two heights, leaf + sheath dry matter was lower at 65 cm. Regarding the grass’s chemical composition, there was an increase in neutral and acid detergent fiber and indigestible neutral detergent fiber contents as the defoliation height increased, which resulted in lower production of potentially digestible dry matter, which can compromise the potential use of the forage by animals. Among evaluated treatments, Mulato II grass defoliation is recommended for a maximum height of 65 cm. Potassium fertilization increases the yield and the potentially digestible dry matter content of Mulato II grass, even when cultivated in soil with high potassium content.
    Type of Medium: Online Resource
    ISSN: 1679-0359 , 1676-546X
    URL: Article
    DOI: 10.5433/1679-0359.2017v38n4SUPLp2719
    Language: Unknown
    Publisher: Universidade Estadual de Londrina
    Publication Date: 2017
    detail.hit.zdb_id: 2551446-5
    SSG: 22
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  • 10
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    Online Resource
    Tolerância de híbridos de braquiária ao estresse hídrico
    Scientific Electronic Archives ; 2023
    In:  Scientific Electronic Archives Vol. 16, No. 10 ( 2023-09-29)
    Details
    In: Scientific Electronic Archives, Scientific Electronic Archives, Vol. 16, No. 10 ( 2023-09-29)
    Abstract: O conhecimento sobre a tolerância ao estresse hídrico é importante para escolher adequadamente o capim conforme às diversas condições edafoclimáticas. Diante disso, o objetivo com esta pesquisa foi verificar a tolerância de híbridos de Brachiaria spp. ao estresse por déficit hídrico e alagamento. O experimento ocorreu em casa de vegetação, em delineamento experimental inteiramente casualizado, com doze tratamentos, em esquema fatorial 4x3, e três repetições. Os tratamentos adotados foram quatro capins, sendo três híbridos de braquiária (Camello, Cayana, Cayman) e B. humidicola cv. Llanero, que foram submetidos a três condições hídricas (déficit hídrico, sem estresse hídrico e alagamento). As gramíneas foram submetidas ao estresse hídrico por 47 dias e neste período foram realizadas duas avaliações. Para todos os capins, o déficit hídrico acarretou redução no número de perfilhos e o déficit hídrico e o alagamento promoveram redução no número de folhas, com maior impacto para o déficit hídrico. O alagamento não comprometeu a massa de forragem da Brachiaria humidicola cv. Llanero, o que demonstrou a tolerância deste capim a este estresse hídrico. Para todos os híbridos, houve a redução da produção de massa de forragem quando submetidos ao estresse hídrico (déficit e alagamento). O deficit hídrico promoveu menor massa de forragem que o alagamento para todos os híbridos estudados, com exceção do Cayana, que foi afetado de modo igual pelo déficit hídrico e alagamento.  O déficit hídrico reduziu a massa de raízes de todos os capins, enquanto o alagamento reduziu a massa de raízes dos capins Camello e Cayana. Observou-se que a Brachiaria humidicola cv. Llanero e o capim Cayman apresentam maior tolerância ao alagamento, visto que nesta condição não houve redução na massa de raízes. Por isso, nenhum dos híbridos tem tolerância ao déficit hídrico e o Cayman é o híbrido com maior tolerância ao alagamento.
    Type of Medium: Online Resource
    ISSN: 2316-9281
    URL: Article
    DOI: 10.36560/161020231792
    Language: Unknown
    Publisher: Scientific Electronic Archives
    Publication Date: 2023
    detail.hit.zdb_id: 2771824-4
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