CECA UFAL

Maceió, Brazil

CECA UFAL

Maceió, Brazil
SEARCH FILTERS
Time filter
Source Type

Broglio-Micheletti S.M.F.,CECA UFAL | da Silva-Dias N.,CECA UFAL | de Araujo A.M.N.,Federal Rural University of Pernambuco | Giron-Perez K.,Federal University of Viçosa | Madalena J.A.S.,Instituto Federal Of Educacao
Revista Caatinga | Year: 2011

Due the fast growing in flowers and ornamental plants production and their high export potential, it is important to identify the insects species associated with Alpinia purpurata (Vieill.) K. Schum crops and to establish their role in this agroecosystem/production system The insects were collected from A. purpurata cv. Pink Ginger and Red Ginger plants cultivated in two farmswith different agroecological characteristics, located in two recognized tropical flower production areas/regions, Maceióand Rí Largo cities/localities, Alagoas state, during one year. They were identified and its frequency analyzed according with a numerical scale. According to the results was collected 790 insects of which 69 were identified to specific level, belonging to 59 families of 9 ordens. Results showed Hymenoptera individuals as the most frequent, mainly predator ants and/or associated with phytophagous insects (sucking), besides natural enemies, followed by Hemiptera and Lepidoptera orders, which involved recognized agricultural pests. Insects belonging to the order Odonata and Orthoptera were found less frequently.


de Carvalho L.W.T.,UFAL | Broglio-Micheletti S.M.F.,CECA UFAL | de Carvalho L.H.T.,Secretaria de Estado da Educacao e do Esporte | Dias N.S.,CECA UFAL | Giron-Perez K.,Federal University of Viçosa
Revista Caatinga | Year: 2011

Some factories of the State of Alagoas are using the fungus entomopathogenic Metarhizium anisopliae as control against Mahanrva fimbriolata. Being so this work it had how aim to value the quantity of nymphs and adults of spittlebug of the root after the air application of the biological insecticide (M. anisopliae), race PL-43 and of the Imidacloprido, and to analyze the costs of this application. The experiment was driven in the sugarcane region of the Factory Cachoeira, located in Maceió-AL, in the period understood between July and September of 2006, on the sugarcane variety SP813250. The application of the products took place in 19 th of July of 2006 and the reapplication in 22th of August of the same year. There was carried out initially a population evaluation of nymphs and adults and others 15, 30 and 45 days after the treatments. The treatments did not differ between them, but when each area was analyzed separately, there were differences between sub-areas of the experimental area and between the periods of application. The total costs of the application of Imidacloprido, were less comparing with the other treatments.


Goncalves E.R.,CECA UFAL | Souza F.C.,CECA UFAL | dos Santos L.N.,CECA UFAL | Silva J.V.,UFAL | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2013

Tabebuia aurea (Benth. & Hook. f. ex S. Moore) (Bignoniaceae) is a boreal species common in Brazil. It is used for ornamental parks and along sidewalks. Its timber is also used for furniture. The objective of this study was to evaluate the effect of nursery shading on the growth and photosynthesis of T. aurea and their photosynthetic adaptation after being transferred to direct sunlight. The T. aurea seedlings were grown under 0, 50, 70 or 95% shade. The photosynthetic active radiation and leaf gas exchange were measured over two distinct periods: 51 (young seedlings) and 70 days after having been sown under each shade treatment. Immediately after the measurements were taken, the seedlings were transferred into full sunlight and the measurements were repeated two times after 15 min and 3 days under ambient sunlight. T. aurea seedlings showed satisfactory growth up to 50% shade in the nursery, which could be verified both by growth measurement and by total biomass accumulation. Shading greater than 70% reduced the number of leaves, the leaf area and the stem diameter in relation to plants exposed to full sunlight. The results suggest that T. aurea seedlings should be grown under full sunlight or under shading up to 50% to maximize their growth in the nursery and to minimize stress when transferring the seedlings to their final planting sites.


Goncalves E.R.,UFAL | Ferreira V.M.,UFAL | Silva J.V.,UFAL | Endres L.,UFAL | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010

Water stress affects a great part of the world's agriculture. Thus, this work was conducted to evaluate photosynthetic traits in four varieties of sugarcane (SP79-1011, RB72454, RB98710 and RB92579) submitted to water stress during the early stage of the vegetative period. The plants were cultivated in plastic pots (15 kg of soil). The study was a factorial (4 varieties × 3 levels of soil water content based on available water capacity (AWC)), in a completely randomized design with 5 replications. The levels of water content in the soil were as follows: control (80 to 100% of AWC), moderate water stress (40 to 60% of AWC) and severe water stress (0 to 20% of AWC). Water stress provoked a significant reduction in stomatic condutance (gs), foliar transpiration (E), net photosynthesis (A) and in the water use efficiency of production (WUEy), irrespective of varieties. The varieties SP79-1011 and RB98710 showed greater stomatal sensitivity, reducing gs and E by the 71 days after the beginning of the water stress treatments, even in the control. However, under such conditions A was little affected, indicating that the plants are capable to fixing CO2 with stomata partially closed. Water stress caused a small reduction in the potential photochemical efficiency (Fv/Fm ratio) in the studied varieties.


Reis L.S.,CECA UFAL | de Souza J.L.,ICAT UFAL | de Azevedo C.A.V.,Bairro Universitario | Lyra G.B.,IF DCA UFRRJ | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

The objective of this paper was to evaluate of net radiation, photosynthetic and solar irradiation in greenhouse conditions cultivated with tomato crop and its relationship with the global solar irradiation of the external environment. The tomato was cultivated in greenhouse (not acclimatized), with covering of polyethylene 0.12 mm of thickness. The global solar irradiation (Rgi), the net radiation (Rni) and the flux density of photosynthetic photons were obtained by radiometers connected to a datalogger installed into the protected environment. The external data (global solar irradiation, Rg) were collected in the Agrometeorological Station of the Agricultural Science Center of Federal University of Alagoas. The protecting environment promoted reduction in the solar irradiation, expressed as the transmittance of the polyethylene in 62%. The relationships between the components of radiation from internal and external environment were expressed satisfactorily by linear regressions, with coefficients of determination (R2) greater than 0.88, while for the photosynthetic irradiation (PARi) the R2 were higher than 0.52. The obtained relationships showed that Rni is 0.60 of the Rgi and the PARi is proportional to 0.28 of the Rg and 0.44 of the Rgi. The mean albedo of crop over the cycle was 0.15.


de Albuquerque A.W.,CECA UFAL | Rocha E.S.,Mestre em Producao Vegetal | da Costa J.P.V.,CECA UFAL | Farias A.P.,Escola Agrotecnica Federal de Satuba | Bastos A.L.,CECA UFAL
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010

The cut tropical flower market in Alagoas-Brazil demands articulate actions in the production chain to reduce costs with mineral fertilizers that represent a significant percentage of the production costs. This work had the objective of evaluating the production components of the tropical flower heliconia Golden Torch submitted to mineral, organic and organic-mineral fertilization. The following variables were evaluated: number of the offshoots per plant, number of flowers stalk per bunch, length and diameter of the flowers stalk, length of the bracts, number of the leaves and leaf area per plant. The results showed that organic and organic-mineral fertilization promoted the highest harvest of flower stalks. The organic fertilization promoted higher yield of the production components in comparison to control and the organic-mineral fertilization treatments. The association of mineral fertilized and organic manure improved the fertilization practice in this crop.


Ferreira Junior R.A.,CECA UFAL | de Souza J.L.,ICAT UFAL | Lyra G.B.,IF DCA UFRRJ | Teodoro I.,CECA UFAL | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

Sugarcane growth can be obtained by biophysical models in which gross photosynthesis (GP) is obtained as a function of solar radiation. This work aims to evaluate sugarcane varieties under irrigation in relation to intercepted photosynthetic active radiation (PARint) and the estimated accumulative GP. To achieve that, a study was conducted at the Federal University of Alagoas during 2008 and 2009, with RB sugarcane varieties. Biometric measurements, production variables and meteorological elements were made. The intercepted photosynthetic irradiance (PAR) was obtained by the difference between PAR and transmitted PAR (PART), which was determined by Beer's Law. The daily GP was estimated numerically by the trapezoidal approach. The production variables had correlations with accumulated PARint and accumulated GP during the crop cycle. The average global solar radiation in the region for rainy season (May-August) was 14.9 MJ m-2. The variety RB92579 had the highest production variables as well as higher intercepted PAR and accumulated GP in the cycle due to its greater capacity for regrowth and energy conversion in photoassimilate.


Ferreira Junior R.A.,CECA UFAL | de Souza J.L.,ICAT UFAL | Escobedo J.F.,São Paulo State University | Teodoro I.,CECA UFAL | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The management of drip irrigation and mechanized harvesting in the sugarcane crop are suggesting combined row plants per square meter spacing. In this context the objective of this study was to evaluate the growth of RB98710 variety, with drip irrigation degree days in two row spacing. For this, two plantings were performed in August 2011, with single (1.0 m) and combined row spacing (0.6 and 1.4 m). Te analyzed data were variables of plant growth (leaf area index, canopy height, length of stems and plants per square meter), production variables and weather elements. Te form factor value for leaf area was equal to 0.65. In both row spacing, the variables of plant growth were related with accumulated degree-days and had adjusted equations with satisfactory applications. Te evaluated variables of plant growth were not different by the used row spacing configurations. Te fresh stalk yield (100.9 t ha-1) and sugar yield (17.8 t ha-1) of irrigated sugarcane crop cultivated in Rio Largo, Alagoas state, Brazil, were not influenced by the use of different row spacing configurations.


Ferreira Junior R.A.,CECA UFAL | de Souza J.L.,ICAT UFAL | Teodoro I.,CECA UFAL | Lyra G.B.,IF DCA UFRRJ | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

Maize was cultivated under three management systems: i) mulching (grass cover); ii) plastic cover in the inter rows and iii) traditional cultivation (bare soil). The components of the incident and transmitted solar radiation in a maize canopy were measured in order to determine the radiation use efficiency (RUE). The photosynthetic irradiation (HF) was considered as 44% of the solar global irradiation. The transmitted HF (HFT) was estimated using Beer's law applied to a plant canopy (HFT = HF exp (-k LAI)), with the light extinction coefficient (k) by fitting an exponential function, which related the fraction of HFT (HFT/HF) and leaf area index (LAI). The intercepted HF (HFI) was calculated by the difference (HFI = HF - HFT). The RUE was estimated using a linear regression (forced to pass through the origin) between the dry matter accumulation (DM) and HFI. The k was 0.628 with the determination coefficient of 0.88. The plants RUE in plots covered with plastic was 3.85 g DM MJ-1 of HFI, showing a higher efficiency compared to other treatments (bare soil 3.31 g MJ-1 and grass 3.58 g MJ -1). However, this promoted lower LAI and therefore had less accumulated HFI, resulting in lower production of DM.


de Albuquerque A.W.,CECA UFAL | dos Santos J.M.,Instituto Federal Of Alagoas | de Farias A.P.,Instituto Federal Of Alagoas
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The silicon fertilization can increase productivity by increasing resistance to lodgaing, to water stress and dehydration after harvest. The objective of this study was to evaluate productivity and postharvest quality of Heliconia Golden Torch under doses and sources of silicon. The experiment was conducted in randomized design in factorial 3 × 4 with four replications, utilizing three sources and four doses of silicon. The following variables were evaluated: number of tillers, the beginning of the flowering, length of flower stem, diameter of flower stem, length of bract, number of flower stem, silicon content in leaves and burning of bracts on the 5th, 10th and 15th day postharvest. The results showed that the application of sodium silicate was better to influence the growth of Heliconia Golden Torch. The higher doses of sodium silicate which influenced the length of flower stem, diameter of flower stem, length of bract and the number of the flower stem were 576, 400 and 560 mg dm-3. The burning of bract was less when sodium silicate was applied at dose of 550 mg dm-3. Content of silicon in the leaf increased with increasing doses of application of calcium silicate.

Loading CECA UFAL collaborators
Loading CECA UFAL collaborators