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  • 1
    Online Resource
    Online Resource
    Productive efficiency of mombasa grass in silvopastoral system under pasture deferment and nitrogen fertilizer
    Universidade Estadual de Londrina ; 2017
    In:  Semina: Ciências Agrárias Vol. 38, No. 5 ( 2017-10-03), p. 3307-
    Details
    In: Semina: Ciências Agrárias, Universidade Estadual de Londrina, Vol. 38, No. 5 ( 2017-10-03), p. 3307-
    Abstract: This study aimed to evaluate the efficiency of Mombasa grass in a silvopastoral system and submitted to different nitrogen fertilization rates and pasture management strategies. Treatments consisted of four nitrogen fertilizer doses (0.0, 125.0, 187.5, and 250.0 kg N ha-1 year-1) and three cutting heights (70, 90, and 105 cm). Plant agronomic and physiologic efficiencies, as well as nitrogen use and accumulation by plants, forage production, and increments of forage production, were verified for the application of nitrogen fertilizer. Nitrogen fertilization was only efficient for grasses cut at 105 cm, where 75% of the applied nitrogen at a dose of 125 kg ha-1 year-1 was recovered. Yet the grasses cut at 70 and 90 cm presented low results for nitrogen fertilization, showing plants with low physiological and agronomic efficiencies. For Mombasa grass in a silvopastoral system, nitrogen fertilization is more efficient when applied at lower doses and for plants cut at higher heights.
    Type of Medium: Online Resource
    ISSN: 1679-0359 , 1676-546X
    URL: Article
    DOI: 10.5433/1679-0359.2017v38n5p3307
    Language: Unknown
    Publisher: Universidade Estadual de Londrina
    Publication Date: 2017
    detail.hit.zdb_id: 2551446-5
    SSG: 22
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  • 2
    Online Resource
    Online Resource
    Temporal variability of soil chemical properties under conventional and silvopastoral cultivation systems
    Research, Society and Development ; 2021
    In:  Research, Society and Development Vol. 10, No. 5 ( 2021-04-27), p. e4910514589-
    Details
    In: Research, Society and Development, Research, Society and Development, Vol. 10, No. 5 ( 2021-04-27), p. e4910514589-
    Abstract: In recent years, agroforestry and silvopastoral systems have been gaining ground in rural areas, especially due to great acceptance by the population of products from locations that preserve the environment, being able to produce food and preserve the natural resources. This study aimed to evaluate the temporal variation of the chemical attributes of the soil in pasture areas managed with silvopastoral system and full sun (monoculture). The areas were evaluated in 2011, 2014 and 2017. Soil samples were collected at depths of 0-10 cm and 10-20 cm. Both systems presented reductions in the levels of organic matter over the evaluated period, reflecting the degradability of the material deposited in the soil. Nevertheless, it is worth mentioning that the silvopastoral system (SPS) was more efficient in maintaining the organic component when compared with monoculture, despite not maintaining regularity in the levels of organic matter in the soil. As for the other chemical parameters, there were also changes, especially related to phosphorus (P) and potassium (K). For P, low replacement via organic material from the pasture and/or native trees in the SSP system were observed, resulting in a marked reduction over time. As for K, the presence of the nutrient was critical in both studied systems and depths, showing low replacement through litter.
    Type of Medium: Online Resource
    ISSN: 2525-3409
    URL: Article
    DOI: 10.33448/rsd-v10i5.14589
    Language: Unknown
    Publisher: Research, Society and Development
    Publication Date: 2021
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  • 3
    Online Resource
    Online Resource
    Nitrogen during the establishment period of Mombasa grass
    Universidade Estadual de Londrina ; 2017
    In:  Semina: Ciências Agrárias Vol. 38, No. 1 ( 2017-03-02), p. 513-
    Details
    In: Semina: Ciências Agrárias, Universidade Estadual de Londrina, Vol. 38, No. 1 ( 2017-03-02), p. 513-
    Abstract: The aim of this study was to investigate the effect of nitrogen (N) concentration during the establishment period of Mombasa grass (Panicum maximum Jacq.). The experiment was conducted using four different N concentrations (0, 30, 60 and 90 kg N/ha) during the establishment period in order to evaluate the effect of nitrogen on the plant. These effects were assessed using different indexes, including the efficiency of nitrogen use and agricultural, physiological and nutritional efficiencies. We also determined the total dry matter and nitrogen accumulation in the plant. The recovery of applied N and the agronomic efficiency of Mombasa grass were found to be greater with increasing N concentrations, and all indexes tested were found to be affected by the concentration of applied N. Based on the indexes studied, 90 kg N/ha was found to be most suitable for Mombasa grass during the establishment period.
    Type of Medium: Online Resource
    ISSN: 1679-0359 , 1676-546X
    URL: Article
    DOI: 10.5433/1679-0359.2017v38n1p513
    Language: Unknown
    Publisher: Universidade Estadual de Londrina
    Publication Date: 2017
    detail.hit.zdb_id: 2551446-5
    SSG: 22
    Location Call Number Limitation Availability
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Morphogenesis and structure of mombassa grass over different growth periods
    Universidade Estadual de Londrina ; 2017
    In:  Semina: Ciências Agrárias Vol. 38, No. 5 ( 2017-10-03), p. 3271-
    Details
    In: Semina: Ciências Agrárias, Universidade Estadual de Londrina, Vol. 38, No. 5 ( 2017-10-03), p. 3271-
    Abstract: This study aimed to evaluate the effect of nitrogen (N) fertilizer doses on morphogenic and structural characteristics of mombassa grass (Panicum maximum Jacq.) at three different periods of the lifespan of tillers. The experiment was conducted in Araguaína-TO, Brazil, from December 2014 to February 2015. It was installed in split plots in a randomized block design with four replications. The doses of N-fertilizer (0, 30, 60, 90 kg N.ha-1) were the plots and the periods evaluated (1PER – first period from day 16 to 30; 2PER from day 31 to 45 and 3PER from day 46 to 60 after germination) were the subplots. The evaluated variables consisted of leaf appearance rate (LAR), leaf elongation rate (LER), stem elongation rate (SER), leaf senescence rate (LSR), phyllochron, tiller number, leaf emergence, and total leaf number. A Pearson correlation analysis was used to morphogenic and structural characteristics along with a regression analysis for all the variables. Overall, increasing N-fertilizer doses positively influenced the leaf appearance and leaf elongation rates, tiller density, and the number of live leaves per tiller. The 90-kg N.ha-1 dose enabled the best morphogenic and structural responses of the forage when compared to the other rates. Each period featured differently, with higher values of LSR, SER, and LER in 3PER when compared to those in 2PER and in 1PER. Therefore, the nutritional supply over the first weeks of tiller lives was defining to an increase in forage production in the remaining periods. In light of this, we observed that as LAR raise in the first days after germination, nutritional supplies are required from day 15 on, mainly nitrogen, so plants could continue their development since initial plant growth determines pasture productive vigor and longevity.
    Type of Medium: Online Resource
    ISSN: 1679-0359 , 1676-546X
    URL: Article
    DOI: 10.5433/1679-0359.2017v38n5p3271
    Language: Unknown
    Publisher: Universidade Estadual de Londrina
    Publication Date: 2017
    detail.hit.zdb_id: 2551446-5
    SSG: 22
    Location Call Number Limitation Availability
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Implantação de pastagens sob sistema monocultivo e integrado com lavoura utilizando biofertilizante de cama de aviário como adubação de cobertura
    FapUNIFESP (SciELO) ; 2015
    In:  Revista Brasileira de Saúde e Produção Animal Vol. 16, No. 3 ( 2015-09), p. 499-512
    Details
    In: Revista Brasileira de Saúde e Produção Animal, FapUNIFESP (SciELO), Vol. 16, No. 3 ( 2015-09), p. 499-512
    Abstract: AbstractThe objective was to evaluate the effect of the use of bio-fertilizers obtained by anaerobic biodigestion Aviary bed productive characteristics of Piatã, grass and soil chemical characteristics. Assessed five doses of biofertilizers (0; 10; 20; 30; 40m3. Ha-1) in two cultivation systems (monoculture system of Piatã grass and grass intercropping system with hybrid forage sorghum Piatã BRS 610). Agronomic characteristics were verified and submitted to structural measures of biofertilizer in the two systems of crops, checked also the influence of biofertilizer in soil chemical characteristics. The two production systems responded efficiently with the application of biofertilizer, however the thatched roofs and tilling was the main components responsible for increased productivity. The doses of biofertilizer brought chemical soil characteristics increments, being identified only difference to K+ and organic matter between systems of crops, evidencing the Member with the highest extraction system of soil nutrients by crops. The biofertilizer proved satisfactory considering increments obtained in the production of fodder, in tiller number, leaf area, mass per tiller being good option for improving the productivity of grass Piatã, responding positively in both production systems.
    Type of Medium: Online Resource
    ISSN: 1519-9940
    URL: Article
    DOI: 10.1590/S1519-99402015000300003
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2015
    detail.hit.zdb_id: 2105712-6
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