scholarly journals Productividad primaria de tres praderas de especies tropicales: pará (Brachiaria mutica), Grama amarga (Paspalum conjugatum) y Pangola (Digitaria decumbens)

2017 ◽  
pp. 3
Author(s):  
Ricardo Almeida-M.
Keyword(s):  
Digitaria Decumbens ◽  
Brachiaria Mutica

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scholarly journals Validación de un algoritmo de procesamiento de imágenes Red Green Blue (RGB), para la estimación de proteína cruda en gramíneas vs la tecnología de espectroscopía de infrarrojo cercano (NIRS)

2020 ◽  
Vol 31 (2) ◽  
pp. e17940
Author(s):  
Oscar Ospina R. ◽  
Héctor Anzola Vásquez ◽  
Olber Ayala Duarte ◽  
Andrea Baracaldo Martínez
Keyword(s):  
Near Infrared ◽  
Cynodon Dactylon ◽  
Reflectance Spectroscopy ◽  
Infrared Reflectance ◽  
Holcus Lanatus ◽  
Near Infrared Reflectance Spectroscopy ◽  
Near Infrared Reflectance ◽  
Pennisetum Clandestinum ◽  
Digitaria Decumbens ◽  
Brachiaria Mutica

            El presente trabajo estuvo orientado a evaluar la precisión del algoritmo de análisis de imágenes Red, Green, Blue (RGB), incluido en el software TaurusWebs ®, que permite calcular el porcentaje de proteína cruda de la materia seca (%PC) de las gramíneas a partir de imágenes de las praderas tomadas por un dron acoplado con cámaras RGB. Se compararon las mediciones del %PC calculadas por el algoritmo frente a un referente, Near Infrared Reflectance Spectroscopy (NIRS), del laboratorio de Corpoica (Agrosavia), calibrado para gramíneas. Se tomaron 42 muestras para NIRS, 18 de gramíneas de trópico alto en Cundinamarca: kikuyo, Pennisetum clandestinum; falsa poa, Holcus lanatus; pasto brasilero, Phalaris arundinacea y 24 de trópico bajo en Tolima, Colombia: pangola, Digitaria decumbens; pará, Brachiaria mutica; bermuda, Cynodon dactylon y colosuana, Bothriochloa pertusa. Los resultados del NIRS se compararon contra las evaluaciones hechas con el algoritmo de las imágenes de las gramíneas provenientes del mismo potrero donde se tomaron las muestras. Los resultados fueron comparados usando las pruebas no paramétricas de correlación de Kendall, rho=0.83 y de Kruskal Wallis. No se encontraron diferencias entre el resultado del %PC de las gramíneas medida por NIRS vs el %PC medida por el algoritmo de análisis de imágenes RGB. En conclusión, la información generada con el algoritmo se puede utilizar para trabajos de análisis del %PC en gramíneas.

scholarly journals Comparación de la fibra detergente neutra en gramíneas, calculada mediante algoritmo de análisis de imágenes rojo, verde y azul vs espectroscopia del infrarrojo cercano

2021 ◽  
Vol 32 (1) ◽  
pp. e17498
Author(s):  
Oscar Ospina R. ◽  
Hector José Anzola Vasquez ◽  
Olber Ayala D. ◽  
Andrea Baracaldo M. ◽  
Juan Arévalo C. ◽  
...  
Keyword(s):  
Cynodon Dactylon ◽  
Phalaris Arundinacea ◽  
Holcus Lanatus ◽  
Pennisetum Clandestinum ◽  
Digitaria Decumbens ◽  
Brachiaria Mutica

El trabajo estuvo orientado a evaluar la precisión del algoritmo de análisis de imágenes Red, Green, Blue (RGB) incluido en el software TaurusWebs V2017® para el cálculo del porcentaje de fibra detergente neutra (FDN) en la materia seca de gramíneas, a partir de imágenes de las praderas tomadas por un dron con cámara RGB. Los resultados fueron comparados con los valores de FDN calculados con espectroscopia del infrarrojo cercano (NIRS). Se tomaron 42 muestras para NIRS: 18 de gramíneas de trópico alto en Cundinamarca: kikuyo (Pennisetum clandestinum), falsa poa (Holcus lanatus) y pasto brasilero (Phalaris arundinacea) y 24 de trópico bajo en Tolima, Colombia: pangola (Digitaria decumbens), pará (Brachiaria mutica), bermuda (Cynodon dactylon) y colosuana (Bothriochloa pertusa). Los resultados se compararon contra 180 evaluaciones hechas con el algoritmo de las imágenes de las mismas gramíneas donde se tomaron las muestras para NIRS. Las pruebas de correlación de Kendall y de Spearman fueron significativas (p<0.05), con una asociación de rho=0.81 para la prueba de hipótesis de Kruskal Wallis (p> 0.05). No hubo diferencias significativas en los valores de FDN bajo las dos metodologías y según la prueba de Wilcoxon las medianas de la FDN calculada por NIRS vs. las del algoritmo son iguales. En conclusión, la información generada con el algoritmo se puede utilizar para trabajos de análisis del FDN en gramíneas.

Grazing trials on the Wallum of south-eastern Queensland. 3. A nursery grazed by sheep

1971 ◽  
Vol 11 (53) ◽  
pp. 633 ◽  
Author(s):  
WW Bryan ◽  
TR Evans
Keyword(s):  
Soil Fertility ◽  
White Clover ◽  
Trifolium Repens ◽  
Single Species ◽  
Grazing Pressure ◽  
Botanical Composition ◽  
Digitaria Decumbens ◽  
Heavy Grazing ◽  
Brachiaria Mutica ◽  
Coastal Lowlands

A nursery of single species and simple mixtures of 12 grasses and 9 legumes at Beerwah on the coastal lowlands of southern Queensland was grazed by sheep for over 16 years. For the last eight years 25.8 wethers a hectare (10.5/acre) were carried and thrived, heavy grazing pressure being maintained. Changes in botanical composition were recorded. The final mixture was dominated by Trifolium repens and Paspalm notatum. Other species to survive were Digitaria decumbens, Pennisetum clandestinum, Paspalum wettsteinii, and Brachiaria mutica. The majority of species failed to survive the close intense grazing by sheep. Annual replacements of phosphorus, sulphur, calcium, and potassium were made but nitrogen was never applied, and the highly productive pasture was maintained by legume nitrogen, mainly from white clover. Soil fertility improved under the pasture.

Grazing trials on the Wallum of south-eastern Queensland. 2. Complex mixtures under common grazing

1968 ◽  
Vol 8 (35) ◽  
pp. 683 ◽  
Author(s):  
WW Bryan
Keyword(s):  
Weight Gain ◽  
Dry Matter ◽  
Live Weight ◽  
Complex Mixtures ◽  
Paspalum Notatum ◽  
Panicum Maximum ◽  
Weight Changes ◽  
Trifolium Incarnatum ◽  
Digitaria Decumbens ◽  
Brachiaria Mutica

Eight legumes and eight grasses in complex mixtures were grazed in common on a welldrained soil at Beerwah, south-east Queensland, for eight years. The aim was to study persistence and productivity and also to follow live weight changes in the cattle. Of the legumes, Trifolium repens, Desmodiam uncinatum, and Lotononis bainesii persisted and spread into other plots ; Centrosema pubescens, Medicago sativa, Phaseolus laithyroides, Trifolium incarnatum, and Desmodium sandwicense were not persistent. Among the grasses Paspalum notatum, P. dilatatum, Digitaria decumbens, and Chloris gaylana all persisted and spread ; P. plicatulum persisted but spread little, Panicum maximum var. trichoglme was reduced to trace proportions, while Paspalam conzmersonii and Brachiaria mutica finally disappeared. Legume content of the pastures was 25 to 30% and weed content about 20%. Annual and seasonal amounts of dry matter on offer are presented. Cattle gained weight for 38 weeks but made no gains for 14 weeks in winter. Once the pastures were well developed, the annual live weight gain was approximately 300 lb an acre. Nitrogen content of the pasture was satisfactory from spring to autumn.

Yield Comparison of Four Forage Grasses at Two Cutting Heights and Three Harvest Intervals

1969 ◽  
Vol 58 (1) ◽  
pp. 26-36
Author(s):  
A. Sotomayor-Ríos ◽  
J. Rodríguez-García ◽  
S. Silva
Keyword(s):  
Crude Protein ◽  
Cynodon Dactylon ◽  
Forage Grasses ◽  
Digitaria Decumbens ◽  
Harvest Intervals ◽  
Cutting Interval ◽  
Harvesting Intervals ◽  
Forage Yields ◽  
Brachiaria Mutica ◽  
Interval Interaction

Four forage grasses, i.e., Pangola, Digitaria decumbens Stent; Tanner, Brachiaria mutica; a Bermuda selection, Cynodon dactylon var. coursii and Hexapangola, Digitaria decumbens Stent, were evaluated under cutting management at the Corozal Substation located in the humid mountainous region of Puerto Rico. The effects of cutting heights of 2 and 6 inches above the ground, and of 30-, 45- and 60-day harvesting intervals were determined over a 2-year period. All grasses received 2 tons of 15-5-10 fertilizer per acre per year. At all cutting heights and harvest intervals, Bermuda (Cynodon dactylon var. coursii) had the highest dry forage yields while Pangola and Hexapangola had the highest crude protein contents. At all harvest intervals the grasses produced more total yields and crude protein per acre yearly when cut to a height of 2 inches than when cut to 6 inches above the ground. Green and dry forage yields produced by the grasses increased and on the average, crude protein content of the grasses decreased with the length of the harvest interval. A significant variety X cutting interval interaction was observed for total dry forage yields. Lower yields were obtained during the dry winter months at all cutting intervals. When cut 2 inches above the ground and every 60 days, Bermuda (Cynodon dactylon var. coursii) produced 28,247 pounds of dry forage per acre yearly containing about 9.0 percent crude protein.

Sterility in Pangolagrass ( Digitaria decumbens Stent) 1

1956 ◽  
Vol 48 (11) ◽  
pp. 505-507 ◽  
Author(s):  
Anilkumar A. Sheth ◽  
Lillian Yu ◽  
John Edwardson
Keyword(s):  
Digitaria Decumbens

Effect of particle size and delignification on the rate of digestion of hemicellulose and cellulose by cellulase in mature pangola grass stems

1983 ◽  
Vol 34 (3) ◽  
pp. 241 ◽  
Author(s):  
CW Ford
Keyword(s):  
Particle Size ◽  
Cell Walls ◽  
Trichoderma Viride ◽  
Structural Features ◽  
Cell Wall Polysaccharides ◽  
Particle Size Reduction ◽  
Digitaria Decumbens ◽  
Hemicellulose Degradation ◽  
Before And After ◽  
The Difference

Stem cell walls of pangola grass (Digitaria decumbens) were ground to two particle sizes (c. 1 and 0.1 mm diameter), and incubated with cellulase (ex. Trichoderma viride) for varying times before and after delignification. Total cell walls finely ground (0.1 mm) with a Spex Shatterbox mill were initially degraded more rapidly (to 24 h) than delignified 1 mm particles. Thereafter the delignified material was solubilized to a greater extent. Subsequent specific determinations of cell wall polysaccharides indicated that delignification increased the rate of hemicellulose degradation to a greater extent than did particle size reduction, whereas the opposite was found for cellulose. The difference between delignified and Spex-ground residues, in terms of the amount of polysaccharide digested, was much greater for cellulose than hemicellulose. It is concluded that structural features play a more important role in limiting cellulase degradation of cellulose than does association with lignin, the reverse being so for hemicellulose.

Study on Domestic Wastewater Treatment of the Horizontal Subsurface Flow Wetlands (HSSF-CWs) Using Brachiaria mutica

2020 ◽  
Vol 11 (10) ◽  
pp. 5627-5634 ◽  
Author(s):  
Van Thi Thanh Ho ◽  
Minh Pham Dang ◽  
Lam Tu Lien ◽  
Tai Thien Huynh ◽  
Tran Van Hung ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Subsurface Flow ◽  
Domestic Wastewater ◽  
Domestic Wastewater Treatment ◽  
Horizontal Subsurface Flow ◽  
Brachiaria Mutica

Persistence and growth of Lotononis bainesii–Digitaria decumbens pastures: 1. Sheep stocking rate

1983 ◽  
Vol 101 (1) ◽  
pp. 1-7 ◽  
Author(s):  
A. Pott ◽  
L. R. Humphreys
Keyword(s):  
Bulk Density ◽  
Soil Bulk Density ◽  
Grazing Pressure ◽  
Stocking Rate ◽  
Digitaria Decumbens ◽  
Heavy Grazing ◽  
Cotton South ◽  
Seed Reserves ◽  
Stocking Rates

SUMMARYSheep were grazed for 2 years at stocking rates of 7, 14, 21 and 28/ha on a pasture comprising Lotononis bainesii and Digitaria decumbens cv. Pangola at Mt Cotton, south–east Queensland. There were six replicates of each treatment grazed in rotation with 3 days' grazing followed by 15 days' rest.The initial dominance of lotononis was lost after 6 months of grazing and lotononis failed to persist satisfactorily at any stocking rate. Demographic studies showed that lotononis behaved as a short-lived plant, predominantly annual, with some vegetative perennation as stolon-rooted units under heavy grazing. Soil seed reserves varied from 5800 to 400 m2 at the lightest and heaviest stocking rates respectively. Lotononis failed to regenerate under Pangola shading or inopportune high grazing pressure. Soil bulk density (0–7 cm) increased from 1·2 to 1·4 g/cm3 according to stocking rate.

scholarly journals Sistemas de cultivo e características do solo afetando a estabilidade de agregados

1998 ◽  
Vol 22 (2) ◽  
pp. 311-317 ◽  
Author(s):  
I. F. Silva ◽  
J. Mielniczuk
Keyword(s):  
Triticum Aestivum ◽  
Zea Mays ◽  
Glycine Max ◽  
Zea Mays L ◽  
Triticum Aestivum L ◽  
Digitaria Decumbens ◽  
Glycine Max L ◽  
Macroptilium Atropurpureum

Em um Latossolo Roxo de Santo Ângelo (RS), e em um Podzólico Vermelho-Escuro de Eldorado do Sul (RS), ambos com textura argilosa, submetidos o primeiro à exploração com cultivo convencional de trigo (Triticum aestivum L.) e soja (Glycine max L.) e sob setária (Setaria anceps L.), e o segundo à exploração com capim-pangola (Digitaria decumbens L.), siratro (Macroptilium atropurpureum L.), plantio direto com aveia (Avena bizantina L.)/milho (Zea mays L.) e área sem vegetação, foi realizado o presente trabalho durante a safra de verão (1990/1991), com o objetivo de avaliar a estabilidade e a agregação do solo sob diferentes sistemas de cultivo. Constatou-se, nessa avaliação, que as gramíneas perenes por meio do seu sistema radicular tiveram grande efeito na agregação e estabilidade dos agregados do solo e que os teores de carbono orgânico, de ferro e alumínio-oxalato, argila e grau de dispersão tiveram também efeitos na agregação do solo, porém insuficientes para explicar as variações entre o diâmetro médio ponderado dos agregados sob os diferentes sistemas de cultivo.

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