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Search Results: 1 - 10 of 187814 matches for " Mario de Andrade;Lira "
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Efeito da fertiliza??o fosfatada na produ??o de raízes, liteira e nodula??o de Mimosa caesalpiniifolia benth
Caldas, Glauco Gouvêa;Santos, Mércia Virginia Ferreira dos;Ferreira, Rinaldo Luiz Caraciolo;Lira Junior, Mario de Andrade;Lira, Mario de Andrade;Saraiva, Felipe Martins;
Revista árvore , 2009, DOI: 10.1590/S0100-67622009000200005
Abstract: this work aimed to evaluate the effect of phosphorus fertilization on nodulation, litter deposition and root system development of m. caesalpiniifolia benth, before and after pruning, at the itambé experimental station of pernambuco agronomical institute - ipa in pernambuco, brazil. treatments were levels of phosphorus fertilization (0, 100 and 200 kg.ha-1 of p2o5) arranged in a randomized block design with six replicates in block i and seven in block ii, with the criterion for block formation being uniformization cut date. samplings were taken before and after pruning of the aerial part root length and root, nodule and litter dry matter had similar results before and after pruning. nodule numbers before pruning were 2, 15 and 6 for 0, 100 and 200 kg.ha-1 of p2o5, respectively, and 1, 6 and 7 after pruning. average root lengths ranged from 552 to 734 cm before and from 389 to 455 cm after pruning. the number of nodules presented variation only from august to november 2005, with values from 2 to 15 and from 1 to 7 nodules, before and after pruning, respectively.
Substitui o parcial do farelo de soja por uréia e palma forrageira (Opuntia fícus indica Mill) em dietas para vacas em lacta o: I. Desempenho
Melo Airon Aparecido Silva de,Ferreira Marcelo de Andrade,Verás Antonia Sherlanea Chaves,Lira Mario de Andrade
Revista Brasileira de Zootecnia , 2003,
Abstract: O objetivo desse trabalho foi avaliar a substitui o parcial do farelo de soja por nitrogênio n o protéico no desempenho de vacas holandesas em lacta o. Oito animais com 90 dias de lacta o e 600 kg de peso vivo, no início do experimento, foram distribuídos em dois quadrados latinos (4X4). A uréia representou 0,0; 0,8; 1,54; e 2,40% da matéria seca (MS) da dieta, correspondente a 2,32; 4,65; 6,66; e 8,02% de proteína bruta (PB) na forma de compostos nitrogenados-n o-protéicos (NNP), que representaram os tratamentos experimentais. O consumo de PB apresentou comportamento quadrático, com valor máximo de 3,3 kg/dia para o nível de 4,71% de NNP. O consumo de cálcio (Ca) aumentou e o de matéria seca (MS); matéria organica (MO); extrato etéreo (EE); carboidratos totais (CHT); carboidratos-n o-fibrosos (CNF); fibra em detergente ácido (FDA) e nutrientes digestíveis totais (NDT) diminuíram linearmente, enquanto os consumos de fibra em detergente neutro (FDN) e de fósforo (P) n o foram influenciados pelos tratamentos experimentais. As produ es de leite sem e com corre o para 3,5% de gordura diminuíram linearmente com a inclus o de uréia e palma forrageira nas dietas. A produ o de gordura, proteína, a composi o do leite, e a eficiência alimentar (kg de leite/ kg de MS consumida) n o foram afetadas pelos níveis de NNP.
Repetibilidade de variáveis produtivas e qualitativas da forragem e da excreta bovina em pastagem de braquiária
Teixeira, Vicente Imbroisi;Dubeux Jr., José Carlos Batista;Mello, Alexandre Carneiro Le?o de;Lira Jr., Mário de Andrade;Lira, Mario de Andrade;Saraiva, Felipe Martins;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011000600012
Abstract: the objective of this work was to determine the repeatability and the number of the required evaluations to obtain determination coefficient greater than 90% in the productive and qualitative variables of forage and cattle excreta on a signal grass (urochloa decumbens) pasture. the utilized variables were: fecal production, feces mineral composition, herbage mineral composition around dung pads, feces biometry, herbage mass and herbage rejection around dung pads, urinary volume, and urine chemical composition. a fixed rotational stocking was used, with three days of occupation and 32 or 67 days of resting period, during the rainy and dry seasons, respectively. repeatability analyzes were obtained with the software genes, using the principal component method based on the covariance. the repeatability coefficients (r) had high estimates, and the r2 were equal to or greater than 90%, except for herbage mass at 20-40 cm, for the difference between pre-and post-grazing herbage height of herbage grown on dung pad, and for nitrogen concentration in the urine for the treatment with 3,2 animal units per hectare (r<0.50). for r2 above 90%, the number of evaluations required would be 11, 9, and 9, for the variables forage, feces, and urine, respectively.
Avalia??o de testes estatísticos de compara??es múltiplas de médias
Sousa, Clayton Albuquerque de;Lira Junior, Mario Andrade;Ferreira, Rinaldo Luiz Caraciolo;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000300008
Abstract: the objective was to verify the efficiency and uniformity of responses from different tests to compare means and the rate of occurrence of type i error. four different tests for multiple comparison of means were applied to 200 experiments and 10 variables created with random values, to assess the number of levels; agreement with the f test and rate of occurrence of type i error per variable and per experiment. the tests differed in their results for all variables. the greatest divergences in results were found when using the lsd test. for the level of significance, the greatest agreement was found by the tukey test.
Deposi??o e acúmulo de matéria seca e nutrientes em serapilheira em um bosque de sabiá (Mimosa caesalpiniifolia Benth.)
Ferreira, Rinaldo Luiz Caraciolo;Lira Junior, Mario de Andrade;Rocha, Mallon Sampaio da;Santos, Mércia Virginia Ferreira dos;Lira, Mário de Andrade;Barreto, Levy Paes;
Revista árvore , 2007, DOI: 10.1590/S0100-67622007000100002
Abstract: quantification of litter deposition and organic mantle accumulation are important steps on nutrient cycling studies. this study aimed to quantify litter deposition and organic mantle in a sabiá (mimosa caesalpiniifolia benth) woodlot in an experimental farm in the brazilian northeast region. twenty 0.50 x 0.50 x 0.15 m wood collectors, to quantify litter deposition, were systematically distributed over the area elevated 30 cm above the soil. deposited material was collected monthly from october 2000 to september 2001, and separated into leaves, twigs, flowers, pods and mixed portions. undecomposed organic mantle was randomly sampled nearby collector boxes, to a total of 20 monthly samples, from which a 0.30 x 0.30 m composed sample was collected. the collected material was also hand separated into leaves, twigs, flowers, pods and mixed portions. all collected material was dried at 60°c until constant weight was achieved. highest monthly litter deposition and leaf and pod fractions occurred in october, probably due to initiation of dry period. litter deposition and stock were estimated at 7830.44 kg.ha-1.year-1 and 8906.9 kg.ha-1, respectively, with the leaf fraction dominating. leaf fraction was the richest in nutrient content.
Decomposi??o de serrapilheira em bosque de sabiá na Zona da Mata de Pernambuco
Freire, Joelma de Lira;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Ferreira, Rinaldo Luiz Caraciolo;Santos, Mércia Virginia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800006
Abstract: the research aimed to evaluate the decomposition of sabiá (mimosa caesalpiniifolia benth) litter fractions by using the nylon bag technique. the following litter fractions were incubated: senescent leaves, leaves at the beginning of mineralization, and branches with diameter up to 20 mm. incubation was performed during periods of 0, 4, 8, 16, 64, 100, and 256 days in 2006 and 2007. the fractions were distributed in a random block design with five replications. it was evaluated the disappearance of biomass, nitrogen (n), and phosphorus (p), concentrations of nitrogen and phosphorus and the carbon/ nitrogen ratio of litter during the periods of incubation. in general, the negative exponential model explained the disappearance of biomass, nitrogen, and phosphorus, however, there was a variation among years and, in some cases, despite of being significant, the models showed a low correlation between predicted and observed data. biomass disappearance rate was slow because only 30% of leaf biomass was mineralized after 256 days of incubation. net nitrogen mineralization showed large variation among years, and it differed among the studied fractions. nitrogen content of the litter increased, on average, until 32 days (leaves) and until 64 days (branches) of incubation followed by stabilization. the linear plateau model was used to explain that process. in the course of the incubation periods, the carbon/nitrogen ration decreased. despite of the high content of nitrogen, the decomposition of sabiá litter is slow, what might reduce the loss of nutrients in the forest, increasing its sustainability and reducing the possible deleterious effects to the environment.
Deposi??o e composi??o química de serrapilheira em um bosque de sabiá
Freire, Joelma de Lira;Dubeux Júnior, José Carlos Batista;Lira, Mario de Andrade;Ferreira, Rinaldo Luiz Caraciolo;Santos, Mércia Virginia Ferreira dos;Freitas, Erinaldo Viana de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800005
Abstract: this research aimed to evaluate the deposition and chemical composition of the components of the existing and deposited litter in a sabiá (mimosa caesalpiniifolia benth) canopy. the experiment was carried out from august 2006 to july 2007. the evaluation of the existing and deposited litter was performed every 28 days using 20 squares with 1m2 randomly allocated and new areas were chosen for each evaluation. the canopy showed plants with an average diameter of 26.8 cm at breast height. monthly deposition of organic matter of leaves and branches during the experimental period was 15,167 kg and 3,373 kg/ha, respectively, and it increased during the highest precipitation period, in a 0.30 relationship with the accumulation, indicating higher accumulation than deposition. leaf proportion was 87% of the total litter, with means of 2.9% of nitrogen and 0.17% of phosphorus. the carbon/nitrogen ratio of leaves was below 30, while carbon/nitrogen ratio of the branches ranged from 30 to 40, proving a better quality for leaves. during the experimental period, deposition of nitrogen through litter was approximately 462 kg/ha and 30 kg/ha for phosphorus. litter deposition is essential for maintenance of soil fertility in a sabiá canopy and it contributes for conservation and sustainability of the canopy.
Relacionamento entre tamanho do nódulo e medi es convencionais da nodula o = Relationship between nodule size and conventional nodulation measurements
José Valdemir Tenório da Costa,Mario de Andrade Lira Junior,Rinaldo Luiz Caraciolo Ferreira,Newton Pereira Stamford
Acta Scientiarum : Agronomy , 2007,
Abstract: Foi testada metodologia que permite o acompanhamento de nódulos individuais de leguminosas ao longo do tempo. Dos sete dias da emergência até a maturidade fisiológica de plantas de caupi, realizaram-se determina es semanais de número, tamanho, matéria seca dos nódulos, área foliar, altura da planta, matéria seca da parte aérea e do sistema radicular e atividade da nitrogenase. Os nódulos foram digitalizados nas resolu es de 100, 200 e 300 pontos porpolegada, e o comprimento e diametro de cada nódulo foram determinados com paquímetro digital e nas imagens digitais. Obtiveram-se imagens do sistema radicular de todas as plantassemanalmente na resolu o de 300 ppp nos lados mais extensos do vaso. As medi es destrutivas e n o destrutivas de tamanho de nódulos geralmente apresentaram-se similares. Medi es n o destrutivas de tamanho de nódulos demonstraram-se como preditoras válidas para medidas como matéria seca de nódulos. A method was tested to allow the study over time of individual legumenodules. From seven days after emergence to full physiological maturity of cowpea plants weekly determinations of nodule number, size and dry matter, leaf area, plant height aerial part and root system dry masses and nitrogenase activity. Nodules were digitized at 100, 200 and 300 dots per inch resolutions, and each nodule length and diameter was measured with a digital pachymeter and on the digital images. Images of the root system of all plants were obtainedweekly at 300 dpi on the larger sides of the pots. Destructive and non-destructive nodule size determinations were generally similar. Non-destructive measures of nodule size were valid predictors for measures such as nodule dry matter.
Distribui??o de biomassa e nutrientes na aréa de Mimosa caesalpiniaefolia Benth
Moura, Orieudo Nunes;Passos, Marco Ant?nio Amaral;Ferreira, Rinaldo Luiz Caraciolo;Molica, Silmar Gonzaga;Lira Junior, Mario de Andrade;Lira, Mário de Andrade;Santos, Mércia Virginia Ferreira dos;
Revista árvore , 2006, DOI: 10.1590/S0100-67622006000600002
Abstract: this work was carried out at itambé experimental station, in the state of pernambuco, brazil, to study biomass and nutrient distribution in stands of mimosa caesalpiniaefolia benth. two stands with similar soil and topographical conditions were studied, involving plants eight and eleven years old, at 3.0 x 3.0 m and 4.5 x 4.5 m spacing, respectively. the biomass of each tree component was determined. samples of leaves, branches, bark and stem were collected and chemically analyzed. total biomass was 66.22 and 80.78 t/ha in stands i and ii, respectively. biomass distribution in stands i and ii was: branches (44.99 and 53.40%), wood (51.53 and 44.58%), bark (2.39 and 1.40%) and leaves (1.10 and 0.62%). nutrients of the components for both stands showed the following concentration trend: nitrogen > calcium > potassium > magnesium > sulfur > phosphorus.
Crescimento e acúmulo de matéria seca em variedades de cana-de-a?úcar cultivadas sob irriga??o plena
Oliveira, Emídio C. A. de;Oliveira, Ruthanna I. de;Andrade, Bruna M. T. de;Freire, Fernando J.;Lira Júnior, Mario A.;Machado, Paulo R.;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2010, DOI: 10.1590/S1415-43662010000900007
Abstract: growth analysis is considered as a standard method for measuring the biological productivity of plant species. the objective of this research was to evaluate the growth and dry matter production of eleven sugarcane varieties (sp79-1011, rb813804, rb863129, rb872552, rb943365, rb72454, rb763710, sp78-4764, sp81-3250, rb867515, rb92579), grown under full irrigation, in the planted cane cycle. the experiment was conducted in field conditions in the municipality of carpina, pe. a randomized block design with four replications was used. the varieties' growth analysis was represented by the quantification of the tillers numbers, stalk height and diameter, measured monthly, in eleven periods of cultivation that extended from 60 to 360 days after planting (dap). the dry matter production was measured from 120 dap, with sampling intervals of every two months. it was observed that, at 360 dap, the rb92579 and sp81-3250 varieties showed the highest tillering and dry matter production. the rb813804 and rb72454 varieties had the highest average for height, while the rb72454 and rb867515 varieties presented the largest stalk diameters.
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