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Search Results: 1 - 10 of 27 matches for " Andropogon gayanus "
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Caracterización de fincas adoptadoras del pasto Andropogon gayanus en el departamento del Cesar, Colombia Caracterización de fincas adoptadoras del pasto Andropogon gayanus en el departamento del Cesar, Colombia
Estrada M. Alfredo,Ramírez Náder Luis Miguel,Sere Carlos
Acta Agronómica , 1987,
Abstract: La razón expuesta por ganaderos para adoptar el pasto A. gayanus es la de poseer una especie que les provea forraje en la época seca. Quienes mayor éxito han obtenido, hasta el momento, son los adoptadores de suelos arenosos o de sabana en la parte central del departamento. En dicha zona se presentan factores de suelo como acidez, existencia de aluminio, texturas arenosas y buenos drenajes; la temperatura promedio es de 26°C, precipitaciones anuales entre 1200 y 2500 mm con una época seca (150 días) sumamente fuerte. El comportamiento del pasto está limitado en la parte sur del departamento por exceso de humedad y en el norte por la presencia de bases y pH elevados. Desde el punto de vista económico, el éxito de la introducción de A. gayanus está relacionado con factores como el bajo costo de oportunidad de las tierras, la baja inversión adicional en ganados, los bajos costos de establecimiento, la complementaridad con otras pasturas en tierras mejores en la misma finca y la elevada rentabilidad marginal de la tecnología que posibilita la adopción aún en a os sin incentivos para invertir en ganadería. This study was carried out in the Cesar Department, Colombia, to identify factors that have led to the adoption of A. gayanus. The expressed reason of r a n e hers is the need for a species that will supply forage during the dry season. Adopters on sandy soils in the middle part of the Zone are up to now those that most succes have been. Soils in this region are characterized by its acidity, presence of aluminum, sandy textures and good drainage. Mean annual temperatures are of 26°C with annual rainfall ranging between 1200 and 2500 mm with a marked dry season (150 days). In the south of the department rainfall is excessive while in the north high base saturation and pH of the soils do not allow the grass success fully competence. Economically, the success of promoting A. gayanus is in relation to some factors such as low opportunity costs of lands; low additional investment costs; ability to completing with other pastures in the best lands within the same farm; and higher marginal profitability from technology, which facilitates adoption even in these seasons without encouragement for investing in livestock .
Characteristics and Mechanicals Potentials of Wood Adhesives Manufactured with Grasses’ Lignins  [PDF]
Lionel Tapsia Karga, Danwe Raidandi, Noel Konai, Antonio Pizzi, Lucien Meva’a
Journal of Materials Science and Chemical Engineering (MSCE) , 2019, DOI: 10.4236/msce.2019.71004
Abstract: In order to manufacture environmentally friendly particle boards and enhance local resources, the lignins of Sorghum bicolor and Andropogon gayanus characterized using RMN 13C and MALDI TOF have the same structures. They contents Guaiacyl (G), Syringyl (S), p-hydroxyphenylpropane (H) and functional groups of phenols, flavonoids and secondary alcohols. The total phenol content determinated using Folin-Ciocalteu reagent is respectively 20.97 and 15.42 mg eqgallic acid/g of extract. The power of their adhesives is different. The Internal Bond (IB) of particleboards manufactured with these adhesives are respectively 0.37 MPa and 0.41 MPa. These lignins can be used as antioxydants.
Uso de Andropogon gayanus bajo diferentes cargas animales, en una sabana eólica del Capanaparo, estado Apure, Venezuela
Torres,René; Aparicio,Rafael; Astudillo,Luís; García,Espedito;
Zootecnia Tropical , 2007,
Abstract: abstract to evaluate andropogon gayanus with young animals in two seasons of the year, under the conditions of the savanna of the capanaparo, between august 1990 and may 1992, it was done an experiment in the ranch the mercedes, achaguas municipality, apure state, on five paddocks which were loaded by 0.5 (low), 1.0 (average), and 1.5 (high) au/ha, respectively. stocking rates in all the cases were established by three heifers indicatives of weight and a young bull grazing, which was withdrawn later to adjust the rates, to which it was taken estimations of the weight every two months. in equal frequency there were realized measurements of production of biomass by paddock, coverage, and height of the pasture, and establishment of tenors of crude protein, phosphorus, calcium, magnesium, copper, and zinc. the highest dm offer was obtained in the rainy season compared to drought, 11 and 9 t dm/ha/year, respectively. the pc contents were 53% higher in the rainy season (6.45%) than in the drought season (3.05%). the tenors of ca, mg, and cu in both seasons were within the normal limits and only the p and zn concentrations were below the critical level. the low stocking rate had the best animal response with 836 g/anim/d in relation to the average and high rates (613, and 652 g/anim/d) in the rainy season
EFEITO DE TRêS ESPéCIES DE GRAMíNEAS FORRAGEIRAS SOBRE A ESTRUTURA DA PASTAGEM E DISTRIBUI O VERTICAL DE LARVAS INFECTANTES DE NEMATóDEOS GASTRINTESTINAIS DE OVINOS
Danilo Gusm?o de Quadros,Américo Garcia da Silva Sobrinho,Luís Roberto de Andrade Rodrigues,Gilson Pereira de Oliveira
Ciência Animal Brasileira , 2012,
Abstract: The knowledge of interaction between infective larvae setting and the type of grass is important to epidemiological studies and the control of gastrointestinal nematodes in sheep. The objective of this work was to evaluate the effects of three species of forage grasses on pasture characteristics and the vertical distribution of infective larvae (L3) of gastrointestinal nematodes of woolless sheep on the grasses during the rainy season. Sixty non-periparturients ewes were used, naturally infected, equally distributed on 2 ha paddocks sowed with Tanzania, star, and gamba grasses, managed under continuous grazing system, from October 2003 to March 2004, at Santa Bárbara farm, Barreiras–Bahia-Brazil. Data of three samples between December 2003 and March 2004 were analyzed by SAS, using split-plot design, with 10 replications. Infective larvae of Haemonchus spp. and Trichostrongylus spp. were observed on forage in all stratus of vertical layer of the grasses without a defined pattern. Pastures with different characteristics under continuous grazing system had good conditions for developing infective larvae of sheep.
Planted Sludge Drying Beds in Treatment of Faecal Sludge from Ouagadougou: Case of Two Local Plant Species  [PDF]
Sawadogo Bienvenue Joceline, Martine Koné, Ouattara Yacouba, Yonli H. Arsène
Journal of Water Resource and Protection (JWARP) , 2016, DOI: 10.4236/jwarp.2016.87057
Abstract: Management of wastewater is a concern of developing countries. In Burkina Faso, an on-site septic system installed on the property is predominant and those systems product high quantities of faecal sludge which are not treated adequately before discharge. Our country is mainly fed by surface water, while water is the main vector of many diseases. So it is very important to manage efficiently wastewater and faeces. The treatment of faecal sludge by planted beds can use local persistent emergent plants like Andropogon gayanus (LPA) and Cymbopogon nardus (LPN). Those planted beds are compared to a non-planted bed (sludge drying bed) (LT). Treating raw sludge (BB) we got the yield over 90% concerning the biological oxygen demand (BOD5) for the LPA while the two others gave performances of 75% and 76% respectively. Regarding the chemical oxygen demand (COD), LPN gave better yields with 77% of removal against 71% and 69% for LPA and LT respectively. Overall, the pilots assured removal of orthophosphates varying between 77% and 79%, while the Kjeldahl nitrogen is removed by the various beds with respective fields of 94%, 96.5% and 97.5% for LPN, LPA and LT. The microbiological pollution abatement is in the order of 1 log unit on average for all beds.
Anti-tick repellent effect of Andropogon gayanus grass on plots of different ages experimentally infested with Boophilus microplus larvae
CRUZ-VAZQUEZ,CARLOS; FERNANDEZ RUVALCABA,MANUEL;
Parasitología al día , 2000, DOI: 10.4067/S0716-07202000000300003
Abstract: the anti-tick repellent effect of andropogon gayanus grass was evaluated on plots of different ages experimentally infested with boophilus microplus larvae, using cenchurus ciliaris as control grass. four infestations were made, at different plant ages, 3, 6, 9 and 12 months old. the effect was evaluated by recovery of larvae from the experimental plots by flagging during a four week period after each infestation. the anti-tick repellent effect observed in a. gayanus grass was manifested only in mature plants, of 6 months old or more where highly differences were detected (p < 0.01) with control grass. the live larval recovery percentages in a. gayanus grass were 16.2%, 11% and 12% in plants of 6, 9 and 12 months old respectively while in c. ciliaris were 22.5%, 19% and 24.5% respectively. the effect of plant age on live larval recovery was greater than the effect of the grass species. further studies are necessary to determine the potential use of this grass in field conditions as part of an integrated tick control package.
Degrada??o de pastagens na Regi?o Amaz?nica: propriedades físicas do solo e crescimento de raízes
Muller, Marcelo Marques Lopes;Guimar?es, Maria de Fátima;Desjardins, Thierry;Martins, Paulo Fernando da Silva;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001001100012
Abstract: the objective of this study was to evaluate: (i) the relation between the degradation of burned guinea grass pastures and the modifications of some physical and morphological properties of an amazonian ultisol; (ii) the root growth of pastures in different degradation stages; and (iii) the potential of rehabilitation of degraded guinea grass pastures by introducing gamba grass. on a farm at the eastern amazon, region of marabá, pa, brazil, four pasture types were studied: productive guinea grass (panicum maximum jacq.) pasture; guinea grass pasture on yield decline; degraded guinea grass pasture (fallow), and degraded guinea grass pasture recovered with gamba grass (andropogon gayanus kunth). as reference of the soil original characteristics before clearing, a native forest area was also studied. burning was an usual practice; moreover, the pastures did not receive fertilizers. pasture degradation decreased soil covering and exposed the soil surface to the direct impact of rain drops and cattle compaction, what resulted in soil bulk density increase in the superficial layer and decrease in clay flocculation and soil total porosity. forage yield decline on degraded pasture was accompanied by a decrease on the number of roots on the soil profile, and there was a concentration of the root system close to the surface. andropogon gayanus showed good potential for the rehabilitation of degraded pastures on the amazon region.
Morphogenetic and structural characteristics of andropogon grass submitted to different cutting heights
Sousa, Braulio Maia de Lana;Nascimento Júnior, Domicio do;Silva, Sila Carneiro da;Monteiro, Hélida Christhine de Freitas;Rodrigues, Carlindo Santos;Fonseca, Dilermando Miranda da;Silveira, Márcia Cristina Teixeira da;Sbrissia, André Fischer;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010001000006
Abstract: this work was performed aiming to evaluate the morphogenetic and structural characteristics of andropogon gayanus cv. planaltina species submitted to three cutting heights (20, 27 and 34 cm). the three cutting heights were allocated in experimental units (12 m2) in a complete randomized block design with three replications. the cuts were done when the light interception by the sward reached 95%. at this moment, the sward height revealed itself constant with values close to 50 cm. the lowest cutting height (20 cm) influenced negatively the final leaf blade length, the number of live leaves, the leaf lifespan, the stem elongation rate and the tiller population density, and it influenced positively the phyllochron and the leaf senescence rate. probably, cuts at 20 cm height caused a high decapitation and death of the tillers. the worst growth conditions in addition to the blossom of this specie occurred during fall resulted in higher stem elongation rates and number of live leaves, and lower phyllochron, final leaf blade length, and leaf lifespan. the sward height can be used as a practical and efficient criterion in the management of andropogon grass. under intermittent management conditions, the regrowth of andropogon grass must be interrupted when the sward reaches 50 cm height, and the defoliation must be interrupted when the stubble height is close to 27 cm.
Anti-tick repellent effect of Andropogon gayanus grass on plots of different ages experimentally infested with Boophilus microplus larvae
CARLOS CRUZ-VAZQUEZ,MANUEL FERNANDEZ RUVALCABA
Parasitología al día , 2000,
Abstract: The anti-tick repellent effect of Andropogon gayanus grass was evaluated on plots of different ages experimentally infested with Boophilus microplus larvae, using Cenchurus ciliaris as control grass. Four infestations were made, at different plant ages, 3, 6, 9 and 12 months old. The effect was evaluated by recovery of larvae from the experimental plots by flagging during a four week period after each infestation. The anti-tick repellent effect observed in A. gayanus grass was manifested only in mature plants, of 6 months old or more where highly differences were detected (p < 0.01) with control grass. The live larval recovery percentages in A. gayanus grass were 16.2%, 11% and 12% in plants of 6, 9 and 12 months old respectively while in C. ciliaris were 22.5%, 19% and 24.5% respectively. The effect of plant age on live larval recovery was greater than the effect of the grass species. Further studies are necessary to determine the potential use of this grass in field conditions as part of an integrated tick control package. Se evaluó el efecto repelente anti-garrapata del pasto Andropogon gayanus en parcelas de diferentes edades que fueron infestadas experimentalmente con larvas de Boophilus microplus, utilizado a Cenchurus ciliaris como pasto control. Se realizaron cuatro infestaciones, a los 3, 6, 9 y 12 meses de edad de la planta, evaluando el efecto por la recuperación de larvas vivas de las parcelas por la técnica de bandera, durante un periodo de cuatro semanas después de cada infestación. Se observó un efecto anti-garrapata en A. gayanus que se manifestó únicamente en plantas maduras, de seis o más meses de edad, en donde se detectaron diferencias altamente significativas (p < 0,01) con respecto al pasto control. Los porcentajes de recuperación de larvas vivas en A. gayanus fueron 16,2%, 11% y 12% en plantas de 6, 9 y 12 meses de edad, respectiva-mente, mientras que en C. ciliaris fueron de 22,5%, 19% y 24,5%, respectivamente. El efecto de la edad de la planta en la recuperación de larvas vivas fue tan alto como el efecto de la especie de pasto. Es necesario realizar estudios para determinar el uso potencial de esta planta en condiciones de campo como parte de un paquete de control integrado de garrapatas
Efecto de la carga sobre la productividad de diferentes clases de animales en la asociación Andropogon gayanus, Melinis minutiflora y Stylosanthes capitata
Caicedo D. Carlos A.,Vera Raul R.
Acta Agronómica , 1986,
Abstract: En el Centro Carimagua (ICA-CIAT) se investigaron los efectos de la disponibilidad de forraje y de la carga en praderas mejoradas sobre la productividad de diferentes clases de animales representativos de los sistemas de producción ganadera del área. Así mismo, se evaluó un sistema de pastoreo continuo donde se relacionaron las tasas de crecimiento de novillos de destete con otras clases de animales, tales como novillas de destete adultos machos para ceba y vacas viejas de descarte. E I dise o experimental fue completamente al azar. Para las estaciones de lluvias las cargas fueron 1.38, 1.85 Y 2.32 animales/ha y de 0.64, 0.85 y 1.07 para la estación seca. En la estación de lluvia I (1983), se detectó interacción significativa (P < 0.05) de carga por clase de animal, con una media general de ganancia de peso de 379 q/an/día. En la estación lluviosa II (1984), el análisis de varianza presentó efecto significativo de las cargas y de las clases de animales. Las ganancias de peso tendieron a aumentar al disminuír la carga. Los machos tuvieron las mayores ganancias de peso. En la estación seca no se presentaron diferencias significativas (P>0.05) ni entre carga ni entre clases de animales. Y la media general de ganancia de peso fue de 137 g/an/día. Experiments were carried out at Carimagua with the aim of investigating the effects of forage availability and stocking rate on the productivity of different classes of animal with in representative improved pasture beef production systems. In addition, a continuos grazing system was evaluated in an attemp to relate steer calf growth rates to other animal classes, such as weaned heifers, adult steers for fattening and cull cows.The experimental desings was completely randomized. The stocking rates were 1.38, 1.85 and 2.32 animals per ha and 0_64, 0.85 and 1.07 animals/ha for the wet dry seasons respectively. F or the first, a significant interaction (P < 0.05) was found between stocking rate an class of animal, with an overall average of 379 g/animal/día. During the second rainy season, the average gain was 513 g/animal/ day. A significant interaction between stocking rates and animal classes was founded. Weight gains tended to increase as stocking rate decreased. Steers exhibited the heighest weight gains. During the dry season no significant differences (P > 0.05) were found either between stocking rates of between animal classes; average weight gain was 137 g/animal/día for this season.
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