Marques M.C.,University of Sao Paulo |
Hamawak O.T.,Federal University of Uberlandia |
Sediyama T.,Federal University of Viçosa |
Bueno M.R.,Agronomia |
And 3 more authors.
Bioscience Journal | Year: 2011
This study aimed to evaluate the average behavior, the genotype x environment (GxE), adaptability and stability of seven soybean cultivars at three sowing dates in Uberlândia-MG. The tests were conducted at Capim Branco Farm, belonging to the Federal University of Uberlândia. Sowing was held on october 29 (1st season), november 24 (2nd season) and december 17 (3rd season) 2007. The experimental design was a randomized, seven genotypes (UFUS Xavante, UFUS Riqueza, UFUS Guarani, UFUS Milionária, Msoy 8001, Msoy 8411 and Msoy 8914) with three replications in each of three sowing dates. Means were compared by Tukey test at 5% probability. Analysis of adaptability and phenotypic stability of genotypes was performed using the Eberhart and Russell (1966), Lin and Binns (1988) modified by Carneiro (1998) and centroid (NASCIMENTO et al., 2009). For grain yield, the cultivar UFUS Xavante was classified as specific adaptability to environment and high stability. The other cultivars were classified as being of general adaptability. For oil content, the cultivars Msoy 8914 and UFUS Xavante behaved as high stability and was classified as having high adaptability. For the character content of protein, all cultivars behaved as wide adaptability and low stability.
Antunez A.,Institute Investigaciones Agropecuarias |
Martinez J.P.,Institute Investigaciones Agropecuarias |
Alfaro C.,Institute Investigaciones Agropecuarias |
Acta Horticulturae | Year: 2011
This study was conducted to determine the effect of the irrigation method on yield, fruit quality and profit benefits for field-grown 'Honey Dew' melon (Cucumis melo L.). Three irrigation treatments were established: furrow (F), surface drip irrigation (SDI) and subsurface drip irrigation (SSDI), in a nested block design while results were analyzed by Dunnett's test, at 95% confidence (α=0.05). Twenty plants were randomly selected, harvested and analyzed per irrigation treatment. Yield was evaluated by number of fruits and fruit size. Fruit quality was evaluated determining dry matter, pH, tritatable acidity (TA), total soluble solid (TSS) content and TSS/TA rate of the fruit's flesh. Drip irrigated melon plants produced up to 35% more commercial fruit than furrow irrigated plants, along with higher soluble solid content and tritatable acidity fruit. Subsurface drip irrigated melon plants (SSDI) had the highest dry matter percentage content of fruits of the treatments produced but the lowest TSS/TA rate. On the other hand, surface drip irrigated plants (SDI) yielded higher percentage of 'first' category fruit along with greater equatorial diameter fruit compared to other treatments.
News Article | November 30, 2015
These are the majority of the participants in the study in Brisbane, Australia, 2012. Credit: CRP cryptic fruit fly pest species. Considered among the agricultural pests with the greatest economic impact, the tephritid fruit flies (Diptera: Tephritidae) are a serious worldwide problem. Destroying fruit and vegetable production and markets across all major continents, some key species have raised international attention, leading to six years of coordinated multidisciplinary research that will contribute to overcome phytosanitary trade barriers and apply more sustainable pest management strategies such as the Sterile Insect Technique (SIT). The collaboration between over fifty researchers from more than twenty countries resulted in twenty-five articles, compiled by editors Drs. Marc De Meyer, Royal Museum for Central Africa, Belgium, Anthony R. Clarke, Queensland University of Technology, Australia, M. Teresa Vera, Facultad de Agronomia y Zootecnia, Universidad Nacional de Tucuman, Argentina, and Jorge Hendrichs, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Austria. They have now been published in a special volume of the open-access journal ZooKeys. Females from numerous native as well as invasive fruit flies species cause tremendous economic losses by laying their eggs directly into ripening fruit and vegetables, where their larvae feed, destroying the crop. Their presence also results in the loss of export markets and expensive quarantine and regulatory controls that further increase the associated costs. The impact of these pests and the requests from the Member States led the Joint Food and Agriculture Organisation / International Atomic Energy Agency (FAO/IAEA) Programme on Nuclear Techniques in Food and Agriculture to assist the governments in developing and applying more environment-friendly pest suppression systems. One example is the SIT package developed and applied against the Mediterranean fruit fly, which resulted in the successful management of this pest species in a number of countries. To further develop such techniques to deal with other major fruit fly species threatening the agriculture in many countries around the world, the scientists needed to resolve first controversies related to species identities, so that they can differentiate taxonomic groups and better understand their biology. Therefore, researchers used multiple, independent lines of evidence to delimit the species boundaries. These included traditional morphology, but also morphometrics, developmental physiology, pre- and postzygotic mating incompatibility, karyology, chemoecology, and a wide range of molecular techniques such as multi-locus markers and microsatellites among others. The present Special Issue presents some of the major findings that are of utmost significance for international horticultural trade and the application of biologically-based pest control methods. The volume is dedicated to two prominent and leading figures in the scientific and research community, Serge Quilici and Peter Teal. Both were part of the initiative from the beginning, but regrettably, passed away recently and were not able to see its conclusion. Explore further: What's in a name? Everything—if you're a fruit fly
Goncalves D.A.M.,University of Amazon |
De Matos G.S.B.,UFRA |
Fernandes A.R.,UFRA |
Barros K.R.M.,Discente Do Curso de Doutorado em Agronomia |
And 2 more authors.
Semina:Ciencias Agrarias | Year: 2016
Studies of heavy metals adsorption in soil play a key role in predicting environmental susceptibility to contamination by toxic elements. The objective of this study was to evaluate cadmium (Cd) and copper (Cu) adsorption in surface and subsurface soil. Samples of six soils: Xanthic Hapludox (XH1 and XH2), Typic Hapludox (TH), Typic Rhodudalf (TR), Typic Fluvaquent (TF), and Amazonian dark earths (ADE) from Eastern Amazonian, Brazil. The soils were selected for chemical, physical and mineralogical characterization and to determine the adsorption by Langmuir and Freundlich isotherms. All soils characterized as kaolinitic, and among them, XH1 and XH2 showed the lowest fertility. The Langmuir and Freundlich isotherms revealed a higher Cu (H curve) than Cd (L curve) adsorption. Parameters of Langmuir and Freundlich isotherms indicate that soils TR, TF and ADE has the greatest capacity and affinity for metal adsorption. Correlation between the curve adsorption parameters and the soil attributes indicates that the pH, CEC, OM and MnO variables had the best influence on metal retention. The Langmuir and Freundlich isotherms satisfactorily described Cu and Cd soil adsorption, where TR, TF and ADE has a lower vulnerability to metal input to the environment. Besides the pH, CEC and OM the MnO had a significant effect on Cu and Cd adsorption in Amazon soils.
Gimenes Jr. M.,Paulista University |
Do Amaral Dal Pogetto M.H.F.,Paulista University |
Prado E.P.,Paulista University |
De Souza Christovam R.,Paulista University |
And 2 more authors.
Semina:Ciencias Agrarias | Year: 2011
Regarding tropical forage plants, the specie Brachiaria ruziziensis are prominence for to be most acceptable for cattle when compared with others Brachiaria species, besides the excellent competitive ability with weeds. Then, this study aimed to evaluate the effects of Brachiaria ruziziensis density in intercropping with corn crop, about weeds control and weeds development in the crop-cattle integration system. The experiment was realized during the period between December/2007 to May/2008, in the experimental area of Escola Superior de Agricultura "Luiz de Queiroz", Piracicaba - SP. The treatment was composed in a factorial arrangement, by combination of four Brachiaria ruziziensis density (0, 10, 15 and 20 kg ha-1) and three weed species ((Ipomoea grandifolia, Digitaria horizontalis e Cenchrus echinatus), in intercropping with corn crop. The evaluations realized were: weed infestation (density m-2), the dry biomass (g plant-1) and leaf area (cm2 plant-1). It was noted that Brachiaria ruziziensis reduced the all of weeds infestation evaluated. Also, it was checked that Digitaria horizontalis and Ipomoea grandifolia were the weeds with most difficult control.
de Campos A.C.T.,Agronomia UFFS |
Radunz L.L.,Agronomia |
Radunz A.L.,UFFS |
Mossi A.J.,Agronomia UFFS |
And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014
The present study evaluated the preference index and insecticidal effect of oil "Carqueja doce" (Baccharis articulata) on the bean weevil (Acanthoscelides obtectus). For the experiment, insects not sexed aged between 20 and 50 days were used. The essential oil was extracted from the aerial parts of the plant by the hydrodistillation method. Te experiment was conducted in a completely randomized design with 6 replications in a factorial scheme 6 × 3 and 6 × 7 (dose × time), respectively, for preference index and insecticidal effect. Tests of repellency and insecticidal activity were conducted with doses of 0, 10, 20, 30, 50 and 100 μL of essential oil in 20 g of beans, being the evaluation carried out after 24, 48 and 72 h for repellency and after 1, 6, 12, 24, 48, 72 and 96 h for the insecticidal activity. Te results showed that the dose, exposure duration and interaction had significant effect on insect mortality. Regarding the dose, the logarithmic increase in the mortality rate was produced by the increase in dose, with an approximately 52 μL dose which recorded death in 90% of the insects. Te exposure time of 35 h caused the death of 90% of insects. Also, the essential oil repellent effect was observed at doses and exposure times studied.
Galvao J.R.,CSIC - Institute of Agricultural Sciences |
Rodrigues Fernandes A.,Institute Ciencias Agrarias |
Melo N.C.,Agronomia |
Alves Silva V.F.,São Paulo State University |
Ferreira De Albuquerque M.P.,Agronomia
Revista Caatinga | Year: 2013
Cowpea [Vigna unguiculata (L) Walp] have great social and economic importance for the Para State. It grows well in areas with low precipitation and two crop cycles can be obtained annually. This study aimed to assess the effect of the residual fertilization from a previous culture (Sorghum bicolor L. Moench) and crop systems on cowpea yield and macronutrient concentration on leaves of three cowpea cultivars (BRSMilênio, BRS-Urubuquara e BRS-Guariba). The study was conducted at the UFRA. The treatments were two crop systems (minimum tillage and conventional), four levels of potassium (50, 100, 200 e 300 kg de KCl ha-1 applied to a previous sorghum culture) and the three cowpea cultivars. Treatments were organized as a three (4 x 2 x 3) factor experiment on a randomized complete block design. The soil was a yellow latosol. In each experiment plot five plants were selected to determine shoot dry matter and foliar nutrient concentration. Grain yield was determined after harvesting all plants on the experiment plot. The residual KCl fertilization affected foliar nutrient content, but did not affect shoot dry mass or yield of grain. Yield was higher in the minimum tillage system. Highest yield (1590 kg ha-1) was recorded int the cv. 'Guariba' when 100 kg of KCl ha-1 had been used in the previous crop. The highest content of leaf N and K was found in cowpea under minimum tillage system. The amount of P and Mg were higher in the conventional system whereas the amount of Ca did not change.
Costa E.,State University of Mato Grosso do Sul |
Leal P.A.M.,University of Campinas |
Benett C.G.S.,Brazilian National Council for Scientific and Technological Development |
Benett K.S.S.,State University of Goiás |
Engenharia Agricola | Year: 2012
The seedlings production is an essential part for vegetables production. Thus, this study aimed to evaluate the environment, the substrates and the containers in the development of tomato seedlings, cv. Santa crus Kada Gigante, in Aquidauana -MS, Brazil region, from October to November, 2008. Polystyrene trays with 72; 128 and 200 cells, filled with four substrates (soil; Plantmax®; coconut fiber and vermiculite) were tested in three protected environments (greenhouse; screened with Sombrite® and screened with Aluminet®). The experimental design was completely randomized, factorial scheme 3x4 (three trays x four substrates), with four replications, being analyzed individual variance analysis and joint analysis for the environments. The environment with screens (Sombrite® and Aluminet®), the trays with 72 cells and the vermiculite produced better results.
Lemes J.S.,Federal University of Pelotas |
Osorio M.T.M.,UFGD |
Osorio J.C.S.,UFGD |
Gonzaga S.S.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária |
And 3 more authors.
Archivos de Zootecnia | Year: 2014
The objective of this study was to evaluate the carcass characteristics and meat quality of Corriedale lambs subjected to two grazing height on millet. The lamb's termination was done in summer annual pasture on a common cultivar of millet (Pennisetum americanum (L.) Leeke). The treatments consisted of two grazing heights, 20 and 40 cm. The slaughter was based on body condition between 2 and 3 (1 to 5 scale). Quantitative and qualitative evaluations were carried out on carcass and meat. The conformation demonstrated great relation with fattening status. There was no difference between subjective characteristics of color and texture. However marbling index values were higher (p<0.01), when lambs grazed on 20 cm height millet. In conclusion, there is neither difference between carcass characteristics and instrumental meat evaluations, nor difference in tissue components of the shoulder in Corriedale lambs subjected to different grazing heights on millet. However, the height of grazing affects the marbling score.