José Alberto Gomide's research while affiliated with Universidad Francisco de Vitoria and other places

Publications (54)

Article
Full-text available
It was evaluated morphogenetic and structural characteristics of the canopy of Brachiaria brizantha cv. Marandu under continuous grazing during the wet season, in different forage supplies and grazing cycles. A random block experimental design was used in a split-plot scheme with three replicates. It was evaluated in the plots the plots, the effect...
Article
It was evaluated the effect of anatomical characteristics and tissue lignification sites on the leaf blade nutritive value of four grasses sampled during the dry and rainy season. Fresh samples of the two last expanded leaf blades on the tiller tops of molassesgrass (Melinis minutiflora Pal. De Beauv), signalgrass (Brachiaria decumbens Staph.), sap...
Article
Full-text available
It was evaluated the effect of anatomical characteristics and tissue lignification sites on the leaf blade nutritive value of four grasses sampled during the dry and rainy season. Fresh samples of the two last expanded leaf blades on the tiller tops of molassesgrass (Melinis minutiflora Pal. De Beauv), signalgrass (Brachiaria decumbens Staph.), sap...
Article
Full-text available
The objective of this work was to evaluate structural, morphological and productive traits of Panicum Maximum cv. Mombaça pasture under rotational stocking. Three rest periods defined in terms of 2.5, 3.5 and 4.5 leaves per tiller were studied. Experimental design was completely randomized with six replicates (paddocks) per treatment. Experimental...
Article
Full-text available
This trial was carried out from November 2001 to November 2002, aiming at the evaluation of the effects of nitrogen fertilization upon the tiller demography and forage biomass in Brachiaria decumbens cv. Basilisk pastures fertilized with nitrogen and subjected to the same grazing height. The treatments consisted of four nitrogen rates (75, 150, 225...
Article
Full-text available
This experiment was carried out to evaluate the effects of nitrogen fertilization upon the morphogenetical and structural characteristics of Brachiaria decumbens under grazing. Four nitrogen rates (75, 150, 225 and 300 kg/ha.yr) were applied before the beginning of the experimental evaluations, which were performed during the Summer, Fall, Winter a...
Article
The botanical composition of pre-established mixtures of six forages species was estimated after in vitro digestion times and compared with the real composition. Three mixtures of six species of known participations were made up in the rainy and dry seasons and estimated through the microhistological technique. The sampling season interfered with t...
Article
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Objetivou-se, com este trabalho, verificar, pela técnica micro-histológica, diferenças entre espécies forrageiras quanto ao percentual de fragmentos identificáveis, em função do processo digestivo e da época do ano. Lâminas foliares frescas recém-expandidas, correspondentes à última e à penúltima posição no perfilho, das espécies Melinis minutiflor...
Article
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Em pastagem de capim Panicum maximum cv. Mombaça, avaliou-se o efeito de dois períodos de descanso, definidos pelo tempo necessário para a expansão de 2,5 e 3,5 novas folhas/perfilho, sobre as características estruturais do dossel altura, massa de forragem verde, de folha verde ede colmo, relação folha/colmo e índice de área foliar (IAF) - e a prod...
Article
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It was evaluated the effect of two rest periods (RPs) on the canopy structural characteristics of paddocks of Mombaçagrass, a cultivar of Panicum maximum, under intermittent grazing; animal production was also evaluated. The RPs were defined by the time required for the expansion of 2.5 and 3.5 new leaves per tiller. Canopy traits response variable...
Article
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A composição botânica de misturas preestabelecidas de seis espécies forrageiras foi estimada após diferentes tempos de digestão in vitro e comparadas com a composição real. Três misturas de seis espécies, com participações conhecidas, foram constituídas nos períodos chuvoso e seco e examinadas pela técnica micro-histológica. O período de amostragem...
Article
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It was assessed the evolution of tillering, forage biomass, leaf area index (LAI), interception of photosynthetically active radiation (IPAR), efficiency of radiation use (ERU) in Panicum maximum "cv" Mombaça during the regrowth period of the grass, in the Summer and Autumn seasons. Similarly, grass growth indices were assessed: net assimilation ra...
Article
The objetive of this study was to verify differences among forages species in relation to the percentage of identifiable fragment as affected by the digestion process and season. Fresh last expanded leaf lamina samples of the species Melinis minutiflora Pal. de Beauv (Molassesgrass), Hyparrhenia rufa (Nees) Stapf. (Jaraguagrass), Brachiaria decumbe...
Article
Full-text available
It was assessed the evolution of tillering, forage biomass, leaf area index (LAI), interception of photosynthetically active radiation (IPAR), efficiency of radiation use (ERU) in Panicum maximum "cv" Mombaça during the regrowth period of the grass, in the Summer and Autumn seasons. Similarly, grass growth indices were assessed: net assimilation ra...
Article
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Os fotoassimilados produzidos pelas folhas são translocados por toda a planta, podendo variar conforme a fase de desenvolvimento, inserção da folha, desfolha, entre outros fatores. A distribuição dos fotoassimilados de folhas individuais para os diversos componentes da planta de Panicum maximum cv. Mombaça foi avaliada em função do nível de inserçã...
Article
Full-text available
It was assessed the nutritive value of hand plucked forage samples collected along the grazing period and the animal performance on Mombaçagrass pasture under intermittent stocking with three rest periods (RP). The RPs were defined by the time required for the expansion of 2.5, 3.5, and 4.5 new leaves per tiller, after six days grazing period. The...
Article
Full-text available
It was assessed the nutritive value of hand plucked forage samples collected along the grazing period and the animal performance on Mombaçagrass pasture under intermittent stocking with three rest periods (RP). The RPs were defined by the time required for the expansion of 2.5, 3.5. and 4.5 new leaves per tiller, after six days grazing period. The...
Article
Full-text available
Avaliaram-se as características morfogênicas, fisiológicas e produtivas de espécies de Brachiaria, durante e após período de estresse hídrico. Os tratamentos foram arranjados em um esquema fatorial 4 x 5 quatro espécies de Brachiaria (B. decumbens, B. brizantha, B. humidicola e B. mutica) e cinco níveis de potencial hídrico do solo (-0, 01, -0, 03,...
Article
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Dois experimentos foram conduzidos, sendo um instalado em área de encosta e outro em área de baixada. Objetivou-se avaliar a tolerância à seca e ao alagamento de três espécies comerciais de Brachiaria (B. decumbens cv. Basilisk, B. brizantha cv. Marandu e B. mutica) e três acessos (B. brizantha B-11, B. humidicola cv. Tupi e B. dictyoneura), a part...
Article
Full-text available
Objetivou-se avaliar a tolerância ao alagameto de quatro espécies de Brachiaria (B. decumbens,B. brizantha, B. humidicola e B. mutica), a partir de suas características morfogênicas, fisiológicas e produtivas. Os tratamentos foram arranjados segundo esquema fatorial 4 x 3 quatro espécies de Brachiaria e três níveis de disponibilidade de água no sol...
Article
This study aimed to evaluate the tolerance of Brachiaria species (B. decumbens, B. brizantha, B. humidicola and B. murtica) to low soil water potential. Morphogenetical, physiological and production characteristics were estimated during and after the stress period. The experimental treatments resulted from 4 x 5 factorial arrangement consisting of...
Article
This study aimed to evaluate the tolerance of four Brachiaria species (B. decumbens, B. brizantha, B. humidicola and B.mutica) to flooding with regard to their morphogenetical, physiological and production characteristics. The experimental treatments resulted from a 4 x 3 factorial arrangement of four Brachiaria species and three flooding condition...
Article
Two experiments were carried out from December/1997 to June/1998. One experiment was performed on hilly area e and the second one on lowland area. These experiments aimed to evaluate the tolerance to flooding and low soil water potential of three commercial Brachiaria species (B. decumbens cv. Basilisk, B. brizantha cv. Marandu a B. mutica) and thr...
Article
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In the last years, the growth dynamics of forage plants has been focused, in order to improve the knowledge of forage yield and distribution process in pasture. The objective of this work was to evaluate the effect of nitrogen fertilization on accumulation of the forage in Brachiaria decumbens Stapf. pastures submitted to the same stocking rate. Tr...
Article
Full-text available
O crescimento do dossel do capim-Mombaça foi analisado sob lotação intermitente com três períodos de descanso (PD), tratamentos definidos em função do tempo necessário para a expansão de 2,5; 3,5 e 4,5 novas folhas por perfilho e período de pastejo de seis dias. A área experimental foi dividida em cinco ou seis piquetes por tratamento. Utilizaram-s...
Article
Full-text available
The tissue flow and structural traits of Panicum maximum cv. Mombaça canopy were evaluated under intermittent stocking, with rest period (RP) defined in terms of the time required for the expansion of 2.5; 3.5 and 4.5 new leaves per tiller. The pa sture treatment was divided into five or six paddocks (replicates) per treatment, observing a complete...
Article
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The objective of this work was to evaluate the distribution of assimilates produced by the top and bottom leaves of the main tiller in plants of Monbaçagrass (Panicum maximum), in two stages of plant development, and three harvest times after plant exposure to 14CO2 (three, eight and twenty four hours). The experimental treatments were arranged in...
Article
Full-text available
The objective of this work was to evaluate the distribution of assimilates produced by the top and bottom leaves of the main tiller in plants of Monbaçagrass (Panicum maximum), in two stages of plant development, and three harvest times after plant exposure to 14CO2 (three, eight and twenty four hours). The experimental treatments were arranged in...
Article
Full-text available
O crescimento do dossel do capim-Mombaça foi analisado sob lotação intermitente com três períodos de descanso (PD), tratamentos definidos em função do tempo necessário para a expansão de 2,5; 3,5 e 4,5 novas folhas por perfilho e período de pastejo de seis dias. A área experimental foi dividida em cinco ou seis piquetes por tratamento. Utilizaram-s...
Article
Full-text available
The tissue flow and structural traits of Panicum maximum cv. Mombaça canopy were evaluated under intermittent stocking, with rest period (RP) defined in terms of the time required for the expansion of 2.5; 3.5 and 4.5 new leaves per tiller. The pasture treatment was divided into five or six paddocks (replicates) per treatment, observing a completel...
Article
Full-text available
A trial was carried out in green-house to estimate morphogenic traits and growth indices of Mombaçagrass development. Three growths were considered: the seminal, establishment growth (G1) and the regrowths following a clipping taken on the 16th (G2) and 37th (G3) days of the seminal growth. The variables assessed were the growth indices: relative g...
Article
It has been shown that with careful grazing management and addition of Pand K, but not N, fertilisers Brachiaria pastures are ableto maintain sustainable live weight gains over many years. However, standardon-farm practice, which generally involves high stocking rates, leads after afew years to pasture decline due mainly to N deficiency for grass r...
Article
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An experiment was carried out to evaluate morphophysiological aspects of Mombaçagrass growth after defoliation. Defoliation treatments were performed when the number of green completely expanded leaves on main tiller had stabilized around 3. Four defoliation treatments were imposed to the main tiller: T1 - no defoliation, T2 - total defoliation, T3...
Article
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A trial was carried out to evaluate the change in digestion of tropical grasses leaf and stem tissues with age. The grasses were signalgrass (Brachiaria decumbens), molassesgrass (Melinis minutiflora) and Tifton 85 bermudagrass (Cynodon sp). The 7th leaf of signalgrass and molassesgrass and the 11th leaf of bermudagrass were sampled by the time of...
Article
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An experiment was carried out to evaluate the effect of leaf age and insertion level and season of growth on the tissue proportion and the cell wall thickness of leaf blade and stem segment of signalgrass (Brachiaria decumbens), molassesgrass (Melinis minutiflora) and Tifton 85 bermudagrass (Cynodon sp). Leaf blades from bottom and top layers were...
Article
Full-text available
An experiment was carried out to evaluate the effect of leaf age and insertion level and season of growth on the tissue proportion and the cell wall thickness of leaf blade and stem segment of signalgrass (Brachiaria decumbens), molassesgrass (Melinis minutiflora) and Tifton 85 bermudagrass (Cynodon sp). Leaf blades from bottom and top layers were...
Article
This work was carried out from December/95 to February/96 to evaluate the effect of two herbage allowances, 4 and 8 kg green herbage dry matter/100 kg live weight, on milk yield of crossbred cows grazing Signalgrass (Brachiaria decumbens). A completely randomized design was used, and milk yield corrected to 4% fat was analyzed by covariance. During...
Article
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The effects of nitrogen and potassium fertilization on elephantgrass - Napier cv. were evaluated. An incomplete N x K factorial arrangement was studied in randomized block design with three replications with seven N levels (20, 50, 100, 200, 300, 350 and 380 kg/ha) and seven K levels (16, 40, 80, 160, 240, 280 and 304 kg/ha). The fourteen N and K c...
Article
This experiment was carried out in greenhouse (vase with 5.5 dm(3) of soil) to evaluate phosphorus (P) uptake, utilization and critical levels as well as tillering in Andropogon gayanus and Guineagrass (Panicum maximum). The plants were grown under different modes: lime (90, 60, 30 days before, and at seeding) and P (30 days before and at seeding)...
Article
The objective of this research was to evaluate the rates of leaf appearance, extension and senescence in 'Tifton-85' bermudagrass (Cynodon spp.) harvested at 14, 21, 28, 35, 42, 49, 56, 63 and 70 days of regrowth. A complete randomized block design, with four replicates, was used. The number of expanded live leaves increased with regrowth interval,...
Article
'Tifton 85' bermudagrass (Cynodon spp.) growth indexes were evaluated at nine ages of regrowth (14, 21, 28, 35, 42, 49, 56, 63 and 70 days) in field plots. A complete randomized blocks design, with four replicates, was used. The maximum value for the relative growth rate (RGR) (.12 g/g.day) was observed at 14 days, when the values of net assimilati...
Article
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Four cultivars of Panicum maximum: Mombaça, Tanzânia, Centenário and Vencedor were grown in pots, under a transparent plastic cover, to evaluate the dynamic of leaf and tillers growth. Two growths, the establishment and the aftermath, after clipping at the age of 21 days, and two types of tiller, main and primary tillers, were studied. A completely...
Article
The degree of a simple linear correlation among the in vitro dry matter disappearance (IVDMD) and chemical composition of the leaf blades and sheath, and stems, sampled from the top and bottom tillers of dwarf elefantgrass (Pennisetum purpureum, Schumach cv. Mott, setariagrass (Setaria anceps, Stapf ex Massey cv. Kazungula) and jaraguagrass (Hyparr...
Article
The tissue proportions, the degree of simple linear correlation of this characteristics with the in vitro dry matter disappearance (IVDMD) and their chemical composition were determined in transversal sections of the botanical fractions, leaf blades and sheath and stem sampled from the top and bottom tillers of dwarf elefantgrass (Pennisetum purpur...
Article
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The objective of this work was to analyze the growth of three cultivars of Panicum maximum: Mombaça, Tanzânia and Vencedor grown in pots, under a transparent plastic cover. The pots were filled with 6 dm3 of redyellow latossol, clayish texture, with high organic matter content. The soil, after sifted, was limed and enriched with N and P, 150 mg/dm3...
Article
The objective of this work was to analyze the growth of three cultivars of Panicum maximum: Mombaca, Tanzania and Vencedor grown in pots, under a transparent plastic cover. The pots were filled with 6 dm(3) of redyellow latossol, clayish texture, with high organic matter content. The soil, after sifted, was limed and enriched with N and P, 150 mg/d...
Article
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Over the last 25 years more than 70 million ha of the native vegetation in Brazil have been replaced by pastures for beef production planted to grasses of the genus Brachiaria, and to a lesser extent Andropogon gayanus, both of African origin. Some years after implantation, these pastures decline in productivity, probably due to low availability of...
Article
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This trial was carried out, from October 1993 until June 1995, to evaluate the chemical composition and dry matter digestibility of dwarf elephantgrass at plant heights of 80 and 120cm under five nitrogen rates. The experimental design was completely randomized with a split split plot arrangement, with four replicates, where the clipping factors, a...
Article
This work was carried out at Vicosa-MG, during two years, to study the effects of five nitrogen (N) rates (0, 75, 150, 225 and 300 kg/ha)and two plants heights (80 and 120 cm) on dry matter yield, leaf area index, net assimilation rate and leaf:stem ratio of dwarf elephant-grass (Pennisetum purpureum cv. Mott). The experimental design was a complet...
Article
Full-text available
RESUMO-Este trabalho foi conduzido em Viçosa-MG, durante dois anos, com o objetivo de avaliar o rendimento forrageiro, o índice de área foliar, a taxa de assimilação líquida e a relação lâmina:colmo do capim-elefante anão (Pennisetum purpureum Shum. cv. Mott), ao atingir 80 e 120 cm de altura, sob cinco doses de nitrogênio [N] (0, 75, 150, 225 e 30...
Article
Full-text available
Mombaçagrass grown in pots was evaluated regarding leaf appearance, elongation and senescence rates; leaf area indices, photosynthetcly active radiation (PAR) interception and the growth indices: leaf area ratio (LAR), net assimilation rate (NAR) and relative growth rate (RGR). Three growths were considered: seminal growth and regrowth after harves...

Citations

... Our evaluations found a positive correlation between the values of the leaf area and shoot dry matter (r = 0.94 **) of emerald grass. The higher leaf area was noted as a result of the high level of interception of sunlight incident that ultimately increased the plant growth [35]. However, the increase in growth provided by higher doses of N is not economically interesting due to the higher number of mowing operations, nutrient removal and maintenance costs of the lawn [4,36]. ...
... Forage plant adaptation and growth can be evaluated by several variables, the most common being dry matter production and allocation in the plant throughout the biological cycle (OLIVEIRA et al., 2000;PORTES et al., 2000;OLIVEIRA et al., 2017). ...
... One reason for this is that with a longer regrowth period, the assimilate partitioning favors an increase in stem contribution in the herbage mass (Silva et al., 2016). During vegetative growth, more assimilates are used to produce leaf tissue, so that incident light is captured to fuel fast growth, resulting in greater LAR (Oliveira et al., 2000). ...
... These increments in LAI as nitrogen fertilization rates increased may be regarded to the increase in leaf area or/and number of leaves per unit area (Table 1) with increasing nitrogen fertilization rates. These trends are in agreement with those obtained by Paciullo et al. (1998) [15] , Jinxing et al. (1998) [8] and Kathju et al. (2001) [9] . at 80-harvest was recorded with spacing of 40 cm x 20 cm which was statistically at par with spacing 30cm x 20 cm at 50-80DAS and with 45cm x 15cm at 80-harvest. ...
... Defoliation patterns of forage plants define the canopy structure which, in turn, is crucial for the forage intake process (Hodgson, 1981). In situations of rotational stocking grazing method, higher grazing intensity directly contributes to a more efficient use of available forage and, indirectly, contributes to a reduction in losses by senescence and death of tissues during the period of plant regrowth (Gomide & Gomide, 1999). Knowledge of the variables involved in the plant-animal-supplement interface helps to define management strategies that allow greater efficiency of use of forage produced (Gastal & Lemaire, 2015), resulting in better economic results and zootechnical indexes. ...
... At the dose in which the relative production was 90%, the nutrient content in the leaf was evaluated and this was considered the critical level (Santos et al. 2002). The critical range could be constructed by subtracting or adding the standard deviation, or its limits could be established as follows: the lower limit corresponded to the leaf content that provided 90% relative production, and the upper limit corresponded to the leaf content that provided 100% relative production (Fonseca et al. 2000). Thus, when the range is constructed using the standard deviation, the amplitude of the range is increased depending on the variability of the data, which is normally high. ...
... Grassland, besides being cultivated perennially, presents the aggravation of being grown on degraded soils with low fertility and without mineral supplementation [3]. Among the various genres of pasture, Urochloa is distinguished by high dry matter production [4], satisfactory levels of protein and fiber, and high adaptability to various soils and climates. Among the climatic factors, the drought demands quickly and momentary adaptation by plants [5]. ...
... Marandu, the greatest phyllochron was observed at the lowest defoliation frequencies, with results between 10.86 and 14.93 days (MARCELINO et al. 2006). Mattos et al. (2005) evaluated the tolerance to drought and elongation of three commercial species and three accessions of Brachiaria and observed an average leaf appearance rate of 0.17 and 0.16 leaves/days for cultivars Tupi and Llanero, respectively, whose values corresponded to a phyllochron of 5.9 and 6.34 days/leaf. However, the average leaf appearance rate was 0.09 and 0.10 cm/day/tiller for cultivars Tupi and Llanero, respectively; these values were lower than those presented here, because the plants were under waterstress conditions. ...
... Replacement of the oxygen consumed by microorganisms from the soil and by the roots of plants occurs slowly due to the low diffusion of oxygen in the water (Dias-Filho 2012). Thus, stomatal conductance is decreased, which reduces the rate of photosynthesis and consequently growth rates (Baruch 1994; Huang et al. 1994; Dias-Filho 2002; Mattos et al. 2005), culminating in a decrease in accumulation of shoots and roots (Dias-Filho 2002). While these symptoms of flooding were observed in our study, they did not occur in all cultivars. ...
... Livestock grazing viability depends on the correct exploitation of pasture and its resources (GOMIDE; GOMIDE, 1999). The importance of determining the height, animal load, and dynamics of plant morphogenesis process is related to the influence of these factors on canopy structure and, consequently, the quantity and quality of the harvested forage. ...