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The objectives of the study were to perform the fodder accumulation curves and morphological components and light
interception to determine the optimal moment of cutting for green fodder of three lines and one wheat variety (Triticum sp.). Harvests were performed at intervals of 7 d, 43 days after sowing (DAS). In each harvest the average height of 20 plants was recorded, the intercepted radiation (IR), dry matter accumulation, morphological composition, and leaf area index (LAI). The sampling unit was a square of 0.45 m2.
ABSTRACT Selective media (potato dextrose agar plus yeast extract, different concentrations of cetyltrimethylammonium bromide (CTAB) and different antibacterials) were evaluated for the isolation of endophytic Beauveria cf. bassiana from dry bean (Phaseolus vulgaris) plants. CTAB amounts of 0.15 and 0.3 g/L plus either dihydrostreptomycin, oxytetracycline or doxycycline resulted in the lowest numbers of common saprophytic fungi and the highest proportional recovery of Beauveria colonies from internal plant tissues.
JONATHAN RAUL GARAY MARTINEZ SANTIAGO JOAQUIN CANCINO BENIGNO ESTRADA DROUAILLET JUAN CARLOS MARTINEZ GONZALEZ ANDRES GILBERTO LIMAS MARTINEZ JAVIER HERNANDEZ MELENDEZ ADELAIDO RAFAEL ROJAS GARCIA (2019)
Dry matter production (DM) and morphological composition were evaluated according to regrowth age (RA; four, six,
and eight weeks) and prairie height (PH) in Pennisetum ciliare cv. H-17, during rainy season (RS) and drought (DS). The variables were total MS (TDM), leaf (LDM), stem (SDM), dead material (DMDM) and PH. A completely randomized design with four repetitions and linear regression analysis was used. During RS, the TDM was similar (p > 0.05) between RA (8342 kg ha-1) and decreased 90% in DS.
Seven associations were evaluated, two grasses and legume planted in different proportions and a monoculture (orchard grass). The research was conducted from september 2012 to september 2014 in the Graduate College, Campus Montecillo, Mexico. The restriction to the legume was 10 and 50% minimum and maximum, respectively. Treatments consisted of the following associations: 20-40-40, 00-50-50, 40-20-40, 50-00-50, 20-70-10, 70-20-10,100-00-00, 40-40-20% of skein (Ov), ryegrass (Ba) and white clover (Tr), respectively. The treatments were randomized in 24 experimental plots of 9 and 8 m, according to a design of a randomized complete block with three replications.
Associations that presented the highest growth rate in two years were; 20-70-10, 20-40-40 and 40-20-40 with an
average of 57 kg MS ha-1 d-1, and the lowest growth rate monoculture skein (100-00-00) with 32 kg MS ha-1 d-1 (p<
Alfalfa (Medicago sativa L.) is the most commonly used legume forage in the diet of dairy cattle in the United States
and Mexico. The objective of this research was to evaluate the productive response of five alfalfa varieties with defined
cutting intervals seasonally. The research was conducted from June 2010 to June 2011 in the Colegio de Postgraduados, Mexico. Commercial varieties evaluated were: San Miguelito, Jupiter, Atlixco, Via lacteal and Cuf 101, which were randomly distributed into 20 experimental plots of 12 x 9 m, according to a randomized complete block with four replications. The variables evaluated were: growth rate, intercepted radiation, leaf area index and plant height. Jupiter and Cuf 101 varieties with 56 and 37 kg DM ha-1 d-1 recorded the highest and lowest growth rate, respectively.
Tropical forests are globally important for biodiversity conservation and climate change mitigation but are being converted to other land uses. Conversion of seasonally dry tropical forests (SDTF) is particularly high while their protection is low. Secondary succession allows forests to recover their structure, diversity and composition after conversion and subsequent abandonment and is influenced by demographic rates of the constituent species. However, how these rates vary between seasons for different plant sizes at different successional stages in SDTF is not known. The effect of seasonal drought may be more severe early in succession, when temperature and radiation are high, while competition and density-dependent processes may be more important at later stages, when vegetation is tall and dense. Besides, the effects of seasonality and successional stage may vary with plant size. Large plants can better compete with small plants for limiting resources and may also have a greater capacity to withstand stress. Weasked how size-dependent density, species density, recruitment andmortality varied between seasons and successional stages in a SDTF. We monitored a chronosequence in Yucatan, Mexico, over six years in three 0.1 ha plots in each of three successional stages: early (3 5 years-old), intermediate (18 20 years-old) and advanced (>50 years-old). Recruitment, mortality and species gain and loss rates were calculated from wet and dry season censuses separately for large (diameter > 5 cm) and small (1 5 cm in diameter) plants. We used linear mixed-effects models to assess the effects of successional stage, seasonality and their changes through time on demographic rates and on plant and species density. Seasonality affected demographic rates and density of large plants, which exhibited high wet-season recruitment and species gain rates at the early stage and high wet-season mortality at the intermediate stage, resulting in an increase in plant and species density early in succession followed by a subsequent stabilization. Small plant density decreased steadily after only 5 years of land abandonment, whereas species density increased with successional stage. A decline in species dominance may be responsible for these contrasting patterns. Seasonality, successional stage and their changes through time had a stronger influence on large plants, likely because of large among-plot variation of small plants. Notwithstanding the short duration of our study.
CHRONOSEQUENCE RESAMPLING PLANT AND SPECIES DENSITY RECRUITMENT MORTALITY DRY SEASON RAINY SEASON SECONDARY FOREST SUCCESSION COMPETITION ENVIRONMENTAL FILTERING BIOLOGÍA Y QUÍMICA CIENCIAS DE LA VIDA BIOLOGÍA VEGETAL (BOTÁNICA) DESARROLLO VEGETAL DESARROLLO VEGETAL
The study was conducted in the village of Filo de Caballos, municipality of Leonardo Bravo, Guerrero, Mexico, from November 2011 to October 2012, in an orchard of Hass avocado, 5 years old. The objective was to evaluate the treatment of chemical and organic nutrition of avocado trees; fertilizers used were: 50 kg tree of cattle dung (manure); 200-100-200 kg ha-1 of N-P-K (edaphic) and 30-10-15.30 kg ha-1 of Ca-Mg-B (foliar). We found that in buds, treatment manure + edaphic + foliar (41 shoots/branch) was better than treatments manure + edaphic (19 shoots/branch), leaf (9 shoots/branch) and the control (21 shoots/branch). And with 17 fruits, manure + treatment + foliar edaphic significantly exceeded the edaphic + foliar treatments (6 fruits), leaf (1 fruit) and the control (3 fruits). The manure + foliar treatment had the highest length (16 cm) of the main shoot, beating the treatment of manure + edaphic (7 cm) and leaf (9 cm). The edaphic + foliar treatment (75 cm2 ) had higher leaf area than control (65 cm2 ) and had the highest fruit weight 2.62 kg with 10 fruits, which was significantly higher than the control (1.51 kg 10 fruits).
Elizabeth Espinosa Dorantes (2019)
Universidad Autónoma Metropolitana (México). Unidad Azcapotzalco.
En la actualidad es una constante sobrepasar los límites tanto administrativos como físicos en las ciudades, generando nuevas necesidades y problemáticas en la definición de criterios urbanísticos. La temática no es menor, ya que la forma de la ciudad puede implicar ocupación extensiva e indiscriminada o aprovechamiento de suelo; por ello, el tema principal que abordamos, desde el enfoque sustentable, es la redefinición de los patrones de ocupación del territorio, considerando que la estructura urbana tiene incidencia en la movilidad y con ello en la definición del uso del espacio, del ahorro de energía, de la dotación de transporte público y privado, entre otras cosas. Por consiguiente, el trabajo que se presenta hace referencia a la relación de la forma urbana y la sustentabilidad, a la necesidad de optimizar el consumo del suelo y a la relevancia de la ordenación del territorio en la definición y viabilidad de patrones de movilidad sostenibles.
Currently it is a constant to exceed the limits in cities (administrative or physical), emerging new needs and problems to set urban criteria in this regard. The theme is not minor, since the shape of the city can involve extensive and indiscriminate occupation or use of land; Therefore, the main theme, from a sustainable approach, is the redefinition of occupation patterns over the territory, considering that the urban structure has an impact on mobility and thus on the definition of the use of space, energy saving, the provision of public and private transport, among other things. Therefore, the work presented refers to the relationship between urban form and sustainability, the need to optimize land consumption and the relevance of spatial planning in the definition and viability of sustainable mobility patterns.
Eco-urbanismo, morfología urbana, movilidad urbana, eco-urbanism, urban morphology. Urban ecology (Sociology) Cities and towns--Growth. Ecología urbana (Sociología). Densidad urbana. HT241 HUMANIDADES Y CIENCIAS DE LA CONDUCTA CIENCIAS DE LAS ARTES Y LAS LETRAS ARQUITECTURA URBANISMO