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Search Results: 1 - 10 of 188975 matches for " Valdemício Ferreira de;Veloso "
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Nitrogênio e potássio via água de irriga??o nas características de produ??o da bananeira 'Grand Naine'
Sousa, Valdemício Ferreira de;Veloso, Marcos Emanuel da Costa;Vasconcelos,cio Flavo Lopes;Ribeiro, Valdenir Queiroz;Souza, Valdomiro Aurélio Barbosa de;d'Albuquerque Junior, Boanerges Siqueira;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000900005
Abstract: the objective of this work was to evaluate the effect of nitrogen and potassium, applied through irrigation water by microsprinkler, on the production characteristics of banana, cv. grand naine. the experimental design was a randomized block with four replications. the treatments consisted of 30, 180, 300, 420 and 570 kg ha-1 year-1 of n and of 55, 330, 550, 770 and 1,045 kg ha-1 year-1 of k2o and a control treatment (no fertilizers), totalizing 11 treatments, according to the plan puebla iii experimental matrix model. the following characteristics were evaluated: average fruit mass, average bunch mass, and fruit yield, referent to the first and the second production cycles. in the first and second production cycle, average fruit mass, average bunch mass and fruit yield were influenced only by the potassium. higher values of average fruit mass (253.47 g), average bunch mass (28 kg) and fruit yield (55.42 t ha-1), for the first production cycle, were obtained with the application of 938.46, 665.38 and 635.00 kg ha-1 of k2o, respectively. in the second cycle, higher values in relation average fruit mass (174.22 g), average bunch mass (32.04 kg) and yield (60.89 t ha-1) were gathered with the application of 725.50, 907.50 and 933.33 kg ha-1 of k2o, respectively. there was no response of evaluated characteristics to nitrogen.
Freqüência de irriga??o em meloeiro cultivado em solo arenoso
Sousa, Valdemício Ferreira de;Coêlho, Eugênio Ferreira;Souza, Valdomiro Aurélio Barbosa de;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000400018
Abstract: the objective of this work was to evaluate the effect of five irrigation frequencies in the productivity and efficience of water use of melon crop cultivated under fertirrigation by drip irrigation in a sandy soil of the coast plains of piauí, brazil. the experiment was allocated in a randomized complete block design, with five treatments and six replications. the treatments were: f1, f2, f3, f4 and f5, irrigation frequency of 0.5, 1, 2, 3 and 4 days, respectively. the irrigation frequency affected the marketable and total yield of the melon crop. the highest total (70.73 t ha-1; 77.99 t ha-1 and 64.21 t ha-1) and marketable (62.20 t ha-1; 63.88 t ha-1 and 53.67 t ha-1) yields were obtained with the frequencies of 0.5 and 1 day, respectively. it was observed that for the leastest frequent of water applications there was a significative reduction (p<0.01) of the marketable and total fruit yield of melon crop. the average fruit weight was not affected by the frequency of water application. the highest and the lowest efficiency of water use, 24.40 kg m-3 and 14.14 kg m-3, were obtained with the frequencies of f1 and f5, respectively. the irrigation frequency twice a day, daily and two days are indicated for melon crop cultivated in sand soil by drip irrigation. the efficiency of water use for the melon crop is higher when the irrigation frequencies are higher.
Avalia??o de parametros hidráulicos para modelos de distribui??o de água no solo sob gotejamento
Coêlho, Eugênio Ferreira;Or, Dani;Sousa, Valdemício Ferreira de;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000400017
Abstract: the transient analytical solutions for water distribution from point source are dependent on the soil parameters a from gardner equation, i.e., k(h) = ks eah and the linearization parameter k=dk(q)/dq assumed constant in the derivation of these solutions. errors in obtaining these parameters result in failure of the solutions. the objective of this work was to evaluate the parameter a and k at different locations in the wetted volume under an isolated and a cyclic infiltration process. matric potential data were collected in several positions of the wetted volume in two situations: (i) beginning of irrigation until steady-state, i.e., only during infiltration process, and (ii) during two irrigation cycles involving infiltration and redistribution processes. the results showed that a and k parameters vary at different locations of the wetted volume related to the dripper according to the water regime at these locations. the use of inverse method for obtaining these parameters requires matric potential data from infiltration and redistribution during at least two irrigation cycles.
Produtividade do maracujazeiro amarelo sob diferentes níveis de irriga o e doses de potássio via fertirriga o
Sousa Valdemício Ferreira de,Folegatti Marcos Vinícius,Frizzone José Ant?nio,Corrêa Rodrigo Alessandro de Lima
Pesquisa Agropecuária Brasileira , 2003,
Abstract: O objetivo deste trabalho foi avaliar o efeito de quatro níveis de irriga o e cinco doses de K aplicadas via fertirriga o por gotejamento na produtividade do maracujazeiro amarelo (Passiflora edulis Sims f. flavicarpa Deg.). O delineamento experimental usado foi o de blocos ao acaso em parcelas subdivididas com quatro repeti es. Os níveis de irriga o (subparcelas) aplicados foram os seguintes: 0,25V (926,76 L); 0,50V (1.528,20 L); 0,75V (2.117,28 L); 1,00V (2.706,36 L), em que V é o volume médio de água aplicado em lisímetro contendo uma planta de maracujá. As doses de K aplicadas em kg de K2O por planta por ano foram: 0,000; 0,225; 0,450; 0,675 e 0,900. A produtividade comercial do maracujazeiro foi influenciada significativamente (P<0,01) pelas doses de K, pelos níveis de irriga o e pela intera o doses de K e níveis de irriga o. Os maiores valores de produtividade comercial do maracujazeiro amarelo foram obtidos com a aplica o de doses de K e níveis de água variando de 0,450 a 0,675 kg planta-1 ano-1 de K2O e de 1.528,20 a 2.117,28 L planta-1 ano-1, respectivamente.
Eficiência do uso da água pelo meloeiro sob diferentes freqüências de irriga??o
Sousa, Valdemício Ferreira de;Coêlho, Eugênio Ferreira;Andrade Junior, Aderson Soares de;Folegatti, Marcos Vinícius;Frizzone, José Ant?nio;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2000, DOI: 10.1590/S1415-43662000000200009
Abstract: the objective of this work was to evaluate the effect of five trickle irrigation frequencies to obtain high yields and maximum water use efficiency in a melon crop cultivated in sandy soil of the coastal tablelands of piauí, brazil. the experiment was carried out in an experimental area of embrapa meio-norte in parnaíba, piauí state, brazil, latitude 3o5' s, longitude 41o47' w and altitude 46.8 m. a randomized block with five treatments and six replications was used, with irrigation frequencies of 0.5, 1.0, 2.0, 3.0 and 4.0 days. the total and commercial yield and water use efficiency were evaluated. the highest total yield (77.985 kg ha-1) and the maximum water use efficiency by melon crop (282.83 kg ha-1 mm-1) were obtained with an irrigation frequency of one day. the irrigation frequencies of 3 and 4 days or higher are not recommended for the melon crop, and if the water is scarce an irrigation frequency of one day should be used.
Produtividade do meloeiro fertirrigado com potássio em ambiente protegido
Viana, Thales Vinícius de Araújo;Sales, Inêz Gifone Maia;Sousa, Valdemício Ferreira de;Azevedo, Benito Moreira de;Furlan, Raquel Aparecida;Costa, Solerne Caminha;
Horticultura Brasileira , 2007, DOI: 10.1590/S0102-05362007000300027
Abstract: we studied the effects of three kalium doses applied via fertigation on the yield of melon plants (cucumis melo l.). the experiment was carried out in a greenhouse installed in limoeiro do norte county, ceará state, brazil. plants were irrigated from april to august, 2002 by a regular or a subsurface drip irrigation system. seeds of the hybrid bonus 2 were sown at 0.5 x 1.0 m. streaks were installed to induce the vertical growth of the plants, up to 2.0 m height. the experimental design followed a 2 x 3 factorial random blocks design. the treatments consisted of the combination of three kalium doses (40; 120 and 200 kg ha-1) and tof two depths of application (0.0 m - surface and 0.20 m - subsurface) with four replications per treatment. the total dry matter, leaf dry matter, average fruit weight, soluble solid content of fruits and yield of fruits were evaluated. the subsurface drip irrigated plants produced higher total dry matter and leaf dry matter. the applied kalium levels, however, resulted in no statistic difference for all evaluated variables.
Produtividade do maracujazeiro amarelo sob diferentes níveis de irriga??o e doses de potássio via fertirriga??o
Sousa, Valdemício Ferreira de;Folegatti, Marcos Vinícius;Frizzone, José Ant?nio;Corrêa, Rodrigo Alessandro de Lima;Eloi, Waleska Martins;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003000400008
Abstract: the objective of this work was to study the effect of four irrigation levels and five k doses applied through fertirrigation by drip irrigation system in the yellow passion fruit (passiflora edulis sims f. flavicarpa deg.) yield. a complete randomized block design in plot subdivided with four replications was used. the treatments resulted from the combination of four irrigation levels [0.25v (926.76 l), 0.50v (1,528.20 l), 0.75v (2,117.28 l) and 1.00v (2,706.36 l), where v is the average volume of water applied in lysimeter with passion fruit plant] with five k doses (0.000, 0.225, 0.450, 0.675 and 0.900 kg plant-1 year -1 of k2o). the commercial yield was affected by irrigation levels, k doses and by the interaction irrigation levels vs. k doses. the majors values of passion fruit commercial yield were obtained with the application of 0.450 to 0.675 kg plant-1 year -1 of k2o, and water levels of 1,528.20 to 2,117.28 l plant-1 year -1, respectively.
Reider Benevides Ferreira,Juarez Patrício de Oliveira Júnior,Ronaldo Veloso Naves,Andréia Luiza Salgado
Pesquisa Agropecuária Tropical , 2009, DOI: 10.5216/pat.v39i1.5617
Abstract: The effect of five growing media, in different proportions of subsoil, limestone, and sugar cane bagasse ash, in the height, stem diameter, and fresh and dry weight of the aerial part and roots of araticum seedlings (Annona crassiflora Mart.) was analyzed. The five growing media were: pure soil; pure soil with limestone; soil + 1/3 of its volume with ash; soil + 1/3 of its volume with ash + limestone; and soil + 2/3 of its volume with ash. The experiment was conducted in a greenhouse, in Goiania, State of Goiás, Brazil, from February through October, 2003, with 50% of shadow, in a randomized block design, with a 2 x 2 + 1 factorial scheme. It was observed that none of the growing media resulted in different growth and stem diameter of the seedlings. However, the positive effect of limestone application was observed in the fresh and dry weight of the aerial part of the seedlings. The application of sugar cane bagasse ash showed to be harmful to the development of the seedlings. KEY-WORDS: Propagation of seedlings; Cerrado fruits; industrial residues.
Ovário-histerectomia em caninos por cirurgia laparoscópica
BRUN, Maurício Veloso;SILVA FILHO, Ant?nio de Pádua Ferreira da;BECK, Carlos Afonso de Castro;MARIANO, Mirandolino Batista;MELLO, Jo?o Roberto Braga de;
Brazilian Journal of Veterinary Research and Animal Science , 2000, DOI: 10.1590/S1413-95962000000600011
Abstract: twenty-four female canine subjects were submitted to ovariohysterectomies through laparoscopic surgical procedures. the surgical procedures were performed under general anesthesia with the animals in dorsal recumbency. the abdominal cavity was accessed through a punction with a veress needle and was inflated with co2. the animal was then placed in trendelemburg position and four trocars were inserted in different regions of the abdominal wall. following uterus identification, blood vessels were isolated and clipped with metallic devices. the body of the uterus was cut cranial to the cervix. the ovarian bursa was exposed and the suspensor ligament was fixed with a nipper. the suspensor ligament was clipped previously to its section. the ovarian arterial-venous complex was clipped and cut with the mesovarium ligament. the round ligament and the mesometrium were cut with a scissors and cauterized. the uterus and both ovaries were removed from the abdominal cavity trough one of the incisions. the most important intra-operatory event was the presence of hemorrhage with one death and one conversion to celiotomy. in the majority of the animals the hemorrhage was controlled with the placement of clips and/or cauterization. the laparoscopic surgery showed to be a suitable technique to perform ovariohysterectomy in canine females.
Doses de potássio por gotejamento no estado nutricional do maracujazeiro
Moraes, Jopson C. B. de;Salcedo, Ignácio H.;Sousa, Valdemício F. de;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2011, DOI: 10.1590/S1415-43662011000800001
Abstract: the objective of this study was to evaluate the effect of potassium doses applied through fertigation by drip irrigation upon the concentration of nutrients in the soil, soil solution and nutritional state of yellow passion fruit plants, in the semi-arid region of piauí, brazil. the experiment was accomplished in the pilot project area of irrigated fruitculture of codevasf, in the santa rosa municipality, piauí state (06° 47' 56''s, 42° 17'17'' w and 187 m of altitude). the experimental layout was a completely randomized block design with five treatments and four replications. the treatments were consisted of five potassium doses (0.00; 0.225; 0.450; 0.675; 0.900 kg of k2o plant-1year-1). the nutritional status of the plants was evaluated and the nutrient concentration in the soil profile and in the soil solution in the layers of 0.0-0.20 and 0.20-0.40 m were determined. the increase of potassium doses applied to the soil through irrigation water increased the potassium concentration and sodium in the soil. the potassium doses caused also significant increases of k in the leaves of yellow passion fruit and increased the plant nutritional state above the optimum level. the potassium concentration in the soil solution varied with plant growth until 132 days after transplant, and remained relatively stable thereafter.
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