Dourados, Brazil
Dourados, Brazil
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Motomiya A.V.A.,FCA UFGD | Molin J.P.,University of Sao Paulo | Motomiya W.R.,State University of Maringa | Biscaro G.A.,FCA UFGD
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

This research aimed to evaluate the spectral response to variation of nitrogen levels and its relationship with leaf nitrogen, chlorophyll and yield in cotton crop. The experiment was conducted in Chapadão do Céu, MS, in a randomized block design with four replications. The treatments consisted of five N rates of 0, 30, 70, 110 and 150 kg ha-1, divided in two applications at 28 and 41 days after emergence, using urea fertilizer as a source. The highest correlations of the chlorophyll index and normalized difference vegetation index with yield were observed in the fourth observation, at 56 days after emergence, indicating that in this period, yield may already be compromised if there is shortage in the supply of N to the crop. The results obtained indicated that the sensor becomes more sensitive to variations of nitrogen levels as the crop grows, but not when it reaches a high leaf area index and in the begining of the senescence. It is concluded that ground level remote sensing permits to estimate indirectly the amount of N absorbed, chlorophyll index and cotton yield.

Biscaro G.A.,Federal University of Grande Dourados | Vaz M.A.B.,University of Sao Paulo | Giacon G.M.,FCA UFGD | Gomes E.P.,FCA UFGD | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

This study evaluated the yield, components of production and oil content of two castor bean cultivars through drip irrigation with different water depths. The research was conducted in 2009 in an Oxisol clay in the experimental field in Dourados, Mato Grosso do Sul State. The experimental design was randomized blocks in factorial scheme with five water depths (0, 25, 50, 100 and 150% of evapotranspiration for drip irrigation) in two castor bean cultivars (IAC 2028 and IAC 80) with four replications. The irrigation schedule was predetermined up to two irrigations per week except on rainy days. The increase of irrigation provided significant increase in most components of production and crop yield without changing the oil content of seeds. The application of higher water depth increased yield by 80% in relation to the treatment that received no supplemental irrigation.

Sanches A.C.,University of Sao Paulo | Gomes E.P.,FCA UFGD | Ramos W.B.,FCA UFGD | Mauad M.,FCA UFGD | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The study was conducted in the May-September 2012 at the Universidade Federal da Grande Dourados, with the main to evaluate the productivity, morphological and productive components of canola (Hybrid Hyola 61) crop under different levels of nitrogen (topdressing) and irrigation. The experimental design was randomized blocks in a split-plot with four replications. The plots were irrigated and no irrigated. The subplots were three treatments with nitrogen (topdressing) doses of 30, 60 and 90 kg ha-1. With the use of irrigation crop attained better results in plant height, shoot dry mass and number of siliqua per plants. The oil content and thousand grain weights showed significant increases as a function of irrigation and nitrogen doses. The yield under irrigation was higher than non-irrigated, with values equal to 3145.65 and 1354.45 kg ha-1, respectively.

Santos F.L.,FCA UFGD | de Queiroz D.M.,Campus Universitario | Pinto F.A.C.,Campus Universitario | de Resende R.C.,Campus Universitario
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010

Quality parameters influence directly the coffee price. However, selective coffee harvesting is frequently associated to good quality of this product. This procedure can be performed by mechanical vibration. Therefore, the study of the frequency and amplitude parameters is important for the design of a specific harvesting machine. The objective of this work was to evaluate the effect of the frequency and amplitude of vibration, the coffee variety and the ripeness condition of the fruits upon the harvesting efficiency. The vibration tests were done in laboratory using an electromagnetic shaker. The tests were done using amplitudes in the range of 3.75 to 7.50 mm and frequencies in the range of 13.33 to 16.67 Hz. Branches of coffee plants of Mundo Novo variety were tested. The highest harvesting efficiency was obtained when using the 26.67 Hz frequency of vibration. The highest harvesting efficiency was obtained when an amplitude of 7.5 mm was used. It was also observed that the number of fruits per stem influences the harvesting efficiency of the coffee fruits of the Mundo Novo variety.

Gomes E.P.,FCA UFGD | Fedri G.,Campus Universitario | Avila M.R.,Pesquisadora da area de propagacao vegetal | Biscaro G.A.,FCA UFGD | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

This research was conducted at the State University of Maringa, Umuarama Campus, Parana State, in the season 2008/2009, with the objective to evaluate the growth and irrigation use efficiency on yield of grain, oil and dry weight of sunflower under irrigation levels. In the irrigated treatments (L1, L2, L3 and L4) the crop coefficients (kc) used were equal (L2), below (L1) and above (L3 and L4) those proposed by FAO. The irrigation favored the crop growth and the highest yield was obtained from values of kc 100% above those proposed by FAO (L4). The highest irrigation use efficiencies were obtained from values of kc by FAO (L2). The grain yield without irrigation (L0) was equal to 4788 kg ha-1, while in L2 and L4 treatments, grain yields were equal to 6304 and 6963 kg ha-1, respectively. The irrigation did not increase the oil content and oil yield was proportional to grain yield.

Araujo W.D.,FCA UFGD | Goneli A.L.D.,FCA UFGD | de Souza C.M.A.,FCA UFGD | Goncalves A.A.,FCA UFGD | Vilhasanti H.C.B.,FCA UFGD
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2014

The present study was accomplished with objective of evaluating the effect of drying on physical properties of peanut kernels. Kernels with initial moisture content of 0.56 decimal (dry weight basis) were dried at a temperature of 40 °C. Physical properties - bulk density, true density, intergranular porosity, thousand grain weight, sphericity, circularity, projected area, surface area and surface/volume ratio were determined. Based on these results, it is concluded that reducing the moisture content promotes reduction in all the physical properties of peanut kernels, except porosity and surface/volume ratio that have their values increased with the reduction of moisture content. The peanut kernels sphericity decreases during the drying process, while the circularity shows no definite trend in the values.

Gordin C.R.B.,Federal University of Grande Dourados | Marques R.F.,Engenheiros Agronomos | Rosa R.J.M.,Engenheiros Agronomos | Dos Santos A.M.,Engenheiros Agronomos | De Paula Quintao Scalon S.,FCA UFGD
Semina:Ciencias Agrarias | Year: 2013

Jatropha curcas L. is a potential oilseed crop for biodiesel production with scarce information about the aluminum effect on the emergence and early growth. This work aimed to evaluate the seed germination and early plant growth of Jatropha plants subjected to aluminum in the irrigation water. Seedlings emergence was evaluated in the presence of five concentrations of aluminum chloride hexahydrated (AlCl3.6H2O) in irrigation water: 0, 5, 10, 15 and 20 mmol L-1. Data was taken on percentage of seedling emergence, speed index, average time for emergence, height, root lengths and shoot and root dry weights. In another experiment, the plants were raised in absence of aluminum up to 25 days after sowing (DAS) and then subjected to the same aluminum concentration in the first experiment. Data was taken on survival rate, chlorophyll content, leaf area, height, root length and shoot and root dry weights. The emergence and speed index of Jatropha seedlings was reduced by the increased aluminum concentrations in irrigation water, with a decrease in seedling emergence of 98% at concentration of 20 mmol L-1. The plants exposed to aluminum at 25 DAS had leaf edge rolling, leaf chlorosis and necrosis, and reduced survival rate, leaf area, chlorophyll content, and shoot and root lengths and dry weights. Therefore, the aluminum in solution affect the seedlings emergence and early growtht of Jatropha plants, observing its toxic effect from the concentration of 5 mmol L-1.

Martins E.A.S.,FCA UFGD | Lage E.Z.,FCA UFGD | Goneli A.L.D.,FCA UFGD | Hartmann Filho C.P.,FCA UFGD | Lopes J.G.,FCA UFGD
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2015

This study aimed to evaluate the kinetics of drying of Serjania marginata leaves, as well as to adjust different mathematical models to the experimental values of the moisture ratio. The Serjania marginata Casar leaves were harvested with initial moisture content of 2.03 ± 0,10 decimal dry basis., and submitted to drying process under controlled conditions of temperature (40, 50, 60 and 70 °C), until the moisture content of 0.08 ± 0,02. Ten mathematical models were fitted to the experimental data and utilized to predict the drying process of agricultural products. Based on the obtained results, the mathematical model of Midilli best represented the kinetics of drying leaves of Serjania marginata. The increase in temperature promotes: an increased rate of water removal in Serjania marginata leaves during drying; the increase of the effective diffusion coefficient, and this relationship can be described through the Arrhenius equation, which presents an activation energy for the liquid diffusion during drying of 81.39 kJ mol−1 for Serjania marginata leaves; an increase in Gibbs free energy, while the enthalpy and entropy decrease. © 2015, Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved.

Nascimento G.R.,University of Campinas | Naas I.A.,University of Campinas | Pereira D.F.,São Paulo State University | Baracho M.S.,University of Campinas | Garcia R.,FCA UFGD
Revista Brasileira de Ciencia Avicola | Year: 2011

This study was conducted to determine the effect of the air temperature variation on the mean surface temperature (MST) of 7- to 35-day-old broiler chickens using infrared thermometry to estimate MST, and to study surface temperature variation of the wings, head, legs, back and comb as affected by air temperature and broiler age. One hundred Cobb® broilers were used in the experiment. Starting on day 7, 10 birds were weekly selected at random, housed in an environmental chamber and reared under three distinct temperatures (18, 25 and 32°C) to record their thermal profile using an infrared thermal camera. The recorded images were processed to estimate MST by selecting the whole area of the bird within the picture and comparing it with the values obtained using selected equations in literature, and to record the surface temperatures of the body parts. The MST estimated by infrared images were not statistically different (p > 0.05) from the values obtained by the equations. MST values significantly increased (p < 0.05) when the air temperature increased, but were not affected by bird age. However, age influenced the difference between MST and air temperature, which was highest on day 14. The technique of infrared thermal image analysis was useful to estimate the mean surface temperature of broiler chickens.

Type: Journal Article | Journal: Anais da Academia Brasileira de Ciencias | Year: 2013

The experimental studies were conducted in 2007-2008, 2008-2009 and 2009-2010 crop seasons, in order to know the agro-economic yield of Chins and Macaquinho taro clones, propagated using huge, extra, large, medium, small and tiny cormels. The harvest was done on average on 202 days after planting, in three crop seasons. Based on the joint analysis of variance carried out, it was observed that taro clones showed significant differences in the yield of fresh and dry weight of leaves, cormels, and commercial and non-commercial comels; besides, there were significant differences in yield of a crop season to another and the size of the cuttings induced significant differences in yield. In the conditions that the experiments were conducted, and considering the highest average yield of fresh weight of commercial cormels (28.69 t.ha-1) and highest net income (US $14,741.14) correspondent to the three crop seasons, it is recommended to cultivate Macaquinho clone using small cuttings in propagation.

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