Navegando por Assunto "Panicum maximum"

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Acesso aberto (Open Access)
Características quantitativas e qualitativas do capim-mombaça, submetido a doses crescentes de nitrogênio em clima tropical úmido – classificação AF
(Universidade Federal do Pará, 2016-02-29) OLIVEIRA, Joelma Kyone Silva de; DOMINGUES, Felipe Nogueira; http://lattes.cnpq.br/1461187309835749
The productive chain of ruminant in northern Brazil has its base sustained by forages being its management and fertilization, grasses perpetuity, extremely important for the high biological value protein final production for human intake. The study aimed to evaluate trades of Panicum maximum cv. Mombaça fertilized with increasing doses of nitrogen at Af weather conditions being this condition classified by frequent rainfall along every month of the year, so, showing no seasonality in rain scheme. There were evaluate productive trades, morphogenetic, structural and chemical of Mombaça grass in parcels. Being the experiment outlined in random blocks with six treatments (0, 10, 20, 30, 40 e 50 kg of N ha-1 aplication-1), each application performed after each cut and four repetitions, a repetition by block totalizing 24 plots and the cut done at a height of 40 cm, whenever the parcels high achieved 90 cm to be considered the time when the canopy intercepts 95% of incident light. The data were submitted to variance and regression analysis, with significance of 5% taken from the linear and quadratic coefficients of determination. Nitrogen fertilization affected (p<0,05) stretching rates, appearance, number of leaves alive by tillers and dry mass production. The forage quality was also affected by N doses (p<0,05), being the levels of CP positively affected and values of TC negatively. The fiber levels and lignin were not influenced by fertilization (p<0,05) being this result positive from the forage nutritional pint of view, once fiber and lignin high levels do not benefit consumption and cause a digestive limitation. The nitrogen provides better qualitative and quantitative results to Mombaça grass in tropical climate areas.
Acesso aberto (Open Access)
Estrutura e produtividade de capim-tanzânia submetido a diferentes frequências de desfolhação
(Universidade Federal do Pará, 2017-05) MACEDO, Vitor Hugo Maués; CUNHA, Antonio Marcos Quadros; CÂNDIDO, Ebson Pereira; DOMINGUES, Felipe Nogueira; MELO, Deyvid de Menezes; RÊGO, Aníbal Coutinho do
The objective of the present study was to evaluate the effect of different frequencies of defoliation at fixed periods on the structural and productive characteristics of Tanzania grass (Panicum maximum) under Am climate conditions in 2014. The experimental design was in complete randomized blocks with six treatments corresponding to six frequencies of defoliation (14, 21, 28, 35, 42, and 49 days) and five repetitions. The data was submitted to regression analysis. The light interception (LI) increased (P <0.05) in an asymptotic way with increasing rest periods. The maximum light interception was 98% and occurred at 42 days of regrowth. The leaf area index (LAI) and the dry matter accumulation increased (P <0.05) linearly varying from 3.6 to 7.1 and from 880.3 to 4051.7 kg.ha-1 of forage dry matter in the frequencies 14-49 days, respectively. The height ranged 44-119 cm at frequencies 14-49 days, respectively. The frequency of defoliation at 95% LI is related to the rest period of 29 days, where the Tanzania grass canopy presented around 63 cm height, critical LAI of 5.1, and forage dry matter accumulation of 2,160 kg ha-1.
Acesso aberto (Open Access)
Produção e características estruturais de capim-Tanzânia sob diferentes frequências de desfolhações em clima tropical Am
(Universidade Federal do Pará, 2016-12-09) MACEDO, Vitor Hugo Maués; CÂNDIDO, Ebson Pereira; http://lattes.cnpq.br/3646672308700905; SILVA, Wilton Ladeira da; http://lattes.cnpq.br/1593390000423230; RÊGO, Aníbal Coutinho do; http://lattes.cnpq.br/4330113577933018
This study determined the effect of different frequency of defoliation (FD) on the structural and production characteristics of Panicum maximum cv. Tanzania during the rainy season (RS) and dry season (DS) of 2015, in the Amazon region of Brazil. A randomized block design with six treatments and five replicates was used. The treatments corresponded to six FD (14; 21; 28; 35; 42 and 49 days). arranged in plots of 12 m2. Were evaluated the demographic pattern of tillering (DPT), tiller population density (TPD), canopy height (CH), leaf area index (LAI), , light interception (LI), total forage accumulation (TFA), and the leaf (LP), stem (SP) and dead material (DMP) proportions. The mean of the variables in each season was subjected to analysis of variance and the unfolding of the interaction between the different FD and the seasons were performed when significant by the F test. The means were analyzed by orthogonal polynomial contrasts using the PROC MIXED procedure of SAS software. Significant interaction (P<0.05) between FD and seasons was observed to the TPD, CH, LI, LAI and TFA variables. The TPD decreased (P < 0.0001) linearly from 891 to 560 tillers/m2 in the RS, and from 533 to 369 tillers/m2 in DS with FD from 14 to 49 days, respectively. Linear response was observed to the CH (P < 0.0001) characterized by the increase of its value with the decreasing of FD. The CH ranged from 58.72 to 117.42 cm with decreasing FD in the RS. In the DS the CH varied less than in the RS wit values between 37.69 and 49.03 cm, characterized for a quadratic adjustment (P = 0.0002). In the RS, the LAI and LI showed quadratic response (P < 0.05) with increasing from 3.60 to 6.05 and from 90.85% to 98.30% in FD from 14 to 49 days, respectively. The TFA which represents the sum of the cycles within each season, showed a quadratic adjustment (P = 0.0028) in RS with higher values for FD of 14 and 21 days, and a quadratic adjustment (P < 0.0001) in DS. In the rainy season it is recommended defoliation frequency around 21 days, corresponding to the 95% light interception and the canopy average height at 71 cm. In the dry season lower frequencies of defoliation are recommended such as every 49 days, due to high forage accumulation in relation to other frequencies in the dry season.