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Search Results: 1 - 10 of 370 matches for " Deise Dalazen;Zoz "
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Forage yield, structural characteristics and nitrogen use efficiency in tropical forages under nitrogen fertilizer Produ o de forragem, características estruturais e eficiência de utiliza o do nitrogênio em forrageiras tropicais sob aduba o nitrogenada
Deise Dalazen Castagnara,Tiago Zoz,Alexandre Krutzmann,Aline Uhlein
Semina : Ciências Agrárias , 2011,
Abstract: This study aimed to evaluate the effects of increasing doses of nitrogen on the morphogenesis, structural and productive grass Panicum maximum cvs. Mombaca and Tanzania, and Brachiaria sp. Mulato. The experiment was conducted under field conditions. The experimental design was randomized blocks in a 3x4 factorial design with three forages (Panicum maximum cvs. Tanzania and Mombaca and Brachiaria sp. cv. Mulato), four N rates (0, 40, 80 and 160 kg ha-1) with three replications. Were evaluated the following parameters: fresh matter production (FMP), dry matter production (DMP), plant height, percentage of dry matter, leaves per tiller, dry matter accumulation rate (DMAR) and nitrogen use efficiency (NUE). Grasses Mombasa and Tanzania showed similar results, and both were superior to Mulato grass for the production of fresh and dry matter. The three species responded to nitrogen application, with an increase in FMP, DMP, DMAR, height and number of tillers. The maximum efficiency in use of N was obtained with a dose of 120 kg ha-1. O presente trabalho objetivou avaliar os efeitos de doses crescentes de nitrogênio sobre as características morfogênicas, estruturais e produtivas das gramíneas Panicum maximum cvs. Momba a e Tanzania, e Brachiaria sp. Mulato. O experimento foi conduzido em condi es de campo. O delineamento experimental utilizado foi de blocos casualizados em esquema fatorial 3x4, com três forrageiras (Panicum maximum cvs. Tanzania e Momba a e Brachiaria sp. cv. Mulato), quatro doses de N (0, 40, 80 e 160 kg ha-1), com três repeti es. Foram avaliados os seguintes parametros: produ o de massa verde (PMV), produ o de massa seca (PMS), altura de planta, porcentagem de massa seca, folhas por perfilho, taxa de acúmulo de massa seca (TAMS) e eficiência de uso de nitrogênio (EUN). Os capins Momba a e Tanzania apresentaram resultados semelhantes, e ambos foram superiores ao capim Mulato quanto à produ o de matéria verde e seca. As três espécies forrageiras responderam a aplica o de nitrogênio, com aumento na produ o de MS, MV, TAMS, altura e número de perfilhos. A eficiência máxima no uso do N foi obtida com a dose de 120 kg ha-1.
Crescimento de Stylosanthes cv. Campo Grande em diferentes níveis de densidade de um Latossolo Vermelho Growth of Stylosanthes cv. Campo Grande at different density levels of an Oxisol
Deise Dalazen Castagnara,Tiago Zoz,Ana Maria Conte e Castro,André Zoz
Revista Ciência Agron?mica , 2013,
Abstract: O Stylosanthes spp. cv. Campo Grande é uma leguminosa recomendada para a recupera o de áreas de pastagens degradadas, entretanto s o escassas as informa es sobre seu desenvolvimento em solos compactados. Assim, objetivou-se com o presente trabalho avaliar o desenvolvimento do Stylosanthes cv. Campo Grande em diferentes níveis de densidade de um Latossolo Vermelho eutroférrico (LVef). O experimento foi desenvolvido no período entre setembro de 2007 e mar o de 2008, em cultivo protegido. O delineamento experimental utilizado foi inteiramente casualizado. Os tratamentos consistiram de cinco níveis de compacta o do solo em sub-superfície (1,0; 1,2; 1,4; 1,6 e 1,8 Mg m-3) com quatro repeti es. As unidades experimentais foram compostas por vasos montados a partir de anéis de PVC sobrepostos. No solo estudado (LVef) o máximo crescimento do Stylosanthes cv. Campo Grande ocorre com a densidade de solo em torno de 1,27 Mg m-3; e densidades de solo acima de 1,00 Mg m-3 limitam o desenvolvimento radicular desta leguminosa. Stylosanthes spp. cv. Campo Grande is a legume recommended for the recovery of degraded areas of pasture, however there is little information about its development in compacted soils. The aim of the present study therefore was to evaluate the development of Stylosanthes cv. Campo Grande at different density levels of a eutroferric Oxisol (LVef). The experiment was carried out in a greenhouse from September 2007 to March 2008. Experimental design was completely randomized, and treatments consisted of five levels of sub-surface soil compaction (1.0, 1.2, 1.4, 1.6 and 1.8 Mg m-3) with four replications. The experimental units were pots made from overlapping PVC rings. In the soil under study (LVef), maximum growth of Stylosanthes cv. Campo Grande occurs at a soil density of around 1.27 Mg m-3; soil densities above 1.00 Mg m-3 limit the root development of this legume.
Crescimento de Stylosanthes cv. Campo Grande em diferentes níveis de densidade de um Latossolo Vermelho
Castagnara, Deise Dalazen;Zoz, Tiago;Castro, Ana Maria Conte e;Zoz, André;Oliveira, Paulo Sergio Rabello de;
Revista Ciência Agron?mica , 2013, DOI: 10.1590/S1806-66902013000200007
Abstract: stylosanthes spp. cv. campo grande is a legume recommended for the recovery of degraded areas of pasture, however there is little information about its development in compacted soils. the aim of the present study therefore was to evaluate the development of stylosanthes cv. campo grande at different density levels of a eutroferric oxisol (lvef). the experiment was carried out in a greenhouse from september 2007 to march 2008. experimental design was completely randomized, and treatments consisted of five levels of sub-surface soil compaction (1.0, 1.2, 1.4, 1.6 and 1.8 mg m-3) with four replications. the experimental units were pots made from overlapping pvc rings. in the soil under study (lvef), maximum growth of stylosanthes cv. campo grande occurs at a soil density of around 1.27 mg m-3; soil densities above 1.00 mg m-3 limit the root development of this legume.
Response of wheat to foliar application of zinc
Zoz, Tiago;Steiner, Fábio;Fey, Rubens;Castagnara, Deise Dalazen;Seidel, Edleusa Pereira;
Ciência Rural , 2012, DOI: 10.1590/S0103-84782012005000015
Abstract: wheat is grown in brazil, mostly in no-till, a system in which the zinc can become potentially deficient, due to excessive application of acidity corrective and phosphate fertilizers in surface and, or at shallow depths. this study aimed to evaluate the effect of foliar application of zinc in agronomic characteristics and yield of wheat. the experimental design was randomized blocks with five replications. treatments consisted of four doses of zinc (0, 54, 108 and 216g ha-1 zn), divided into two foliar applications, the first at tillering (18 days after plant emergence) and the second at the boot stage (65 days after emergence). foliar application of zinc increased the number of fertile tillers and yield of wheat, however, have little effect on the agronomic characteristics of no-tilled crop with high nutrient content in soil.
Produ??o e composi??o químico-bromatológica da aveia preta fertilizada com doses crescentes de dejeto líquido suíno
Mondardo, Daniela;Castagnara, Deise Dalazen;Oliveira, Paulo Sergio Rabello de;Zoz, Tiago;Mesquita, Eduardo Eustáquio;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000200034
Abstract: the work has as objective evaluate the effect of application of increasing doses of pig slurry under yield and chemical composition of black oat shoot. the experiment was carried out in no-tillage system under experimental design of randomized blocks with four replications and the treatments composed by application of 0; 10; 20; 30; 40; 50 m3 ha-1 of pig slurry. were determined the yield of total dry mass, the leaf-stem ratio and content of crude protein (cp), acid detergent fiber (adf), neutral detergent fiber (ndf), mineral matter (mm), organic matter (om), nitrogen (n), phosphorus (p), potassium (k), calcium (ca), magnesium (mg), copper (cu), zinc (zn), manganese (mn), iron (fe). the application of pig slurry did not promote significant effects on dry mass yield and content of ndf, mm and om, but promoted linear increase of leaf-stem ratio and of cp and linear decrease in content of adf. regarding to minerals, the doses of pig slurry promoted linear increase in contents of n, p, k, ca, and zn, without effects on the other studied minerals. the use of pig slurry fertilization on the oat crop until the dose 50 m3 ha-1 does not increase forage production but increases the nutritional value.
Effects of aluminum on plant growth and nutrient uptake in young physic nut plants Efeitos do alumínio no crescimento e na absor o de nutrientes em plantas jovens de pinh o-manso
Fabio Steiner,Tiago Zoz,Artur Soares Pinto Junior,Deise Dalazen Castagnara
Semina : Ciências Agrárias , 2012,
Abstract: Aluminum (Al3+) toxicity is a major limiting factor to crop productivity in acid soils. The effects of aluminum on root and shoot growth of physic nut (Jatropha curcas L.) young plants and, the uptake and distribution of phosphorus, calcium, magnesium and aluminum in the roots and shoots were investigated in the present study. Plants were grown in 2.5L pots in a greenhouse. After fourteen days of adaptation to nutrient solution, plants were exposed to Al concentrations of 0, 370, 740, 1,100 and 1,480 ?mol L–1, corresponding to an active Al3+ solution of 13.3, 35.3, 90.0, 153.3 and 220.7 ?mol L–1, respectively. The dry matter partitioning between roots, stems and leaves, and the concentrations of P, Ca, Mg and Al in plant tissue, were measured after 75 days exposure to Al. The increasing level of Al3+ activity in solution progressively decreased the growth of the shoot and root of physic nut plants, and at the two highest active Al3+ levels, plants showed morphological abnormalities typical of the toxicity caused by this metal. Higher Al3+ activity reduced P concentrations in leaves and Ca and Mg in leaves and roots of physic nut, demonstrating the effect of Al on the uptake, transport and use of these nutrients by plants. The Al accumulated preferentially in the roots of physic nut, whereas only a small amount was transported to shoots. A toxicidade de alumínio (Al3+) é um dos principais fatores que limitam a produtividade das culturas em solos ácidos. O objetivo deste estudo foi avaliar o efeito do alumínio no crescimento e na absor o de fósforo, cálcio, magnésio e alumínio em plantas jovens de pinh o-manso, cultivadas em solu o nutritiva. O experimento foi conduzido em vasos de 2,5 L e as plantas crescidas em casa de vegeta o. Após 14 dias de adapta o em solu o nutritiva, as plantas foram submetidas a concentra es de Al de: 0; 370; 740; 1.110 e 1.480 ?mol L–1, que corresponderam a atividade de Al3+ em solu o de: 13,3; 35,3; 90,0; 153,3 e 220,7 ?mol L–1 de Al3+, respectivamente. A parti o de matéria seca entre raízes, caule e folhas e os teores de P, Ca, Mg e Al no tecido vegetal foram avaliados após 75 dias de exposi o ao Al. O aumento da atividade de Al3+ em solu o diminuiu progressivamente o crescimento da parte aérea e das raízes das plantas de pinh o-manso, sendo que nas duas maiores atividades de Al3+ as plantas apresentaram anormalidades morfológicas típicas de injúria provocada por esse metal. O aumento da atividade de Al3+ reduziu os teores de P nas folhas e de Ca e Mg nas folhas e raízes do pinh o-manso reportando o efeito do Al na
Taxa de semeadura de Brachiaria brizantha consorciada com milho na incidência de plantas daninhas Seeding rate of Brachiaria brizantha intercropped with corn in the incidence of plants
Deise D. Castagnara,Tiago Zoz,Luiz N. Berté,Cristiane C. Meinerz
Revista Brasileira de Ciências Agrárias , 2011, DOI: 10.5039/agraria.v6i3a1067
Abstract: A cobertura vegetal do solo promovida pela Brachiaria brizantha pode reduzir a incidência de plantas daninhas na área de cultivo. Assim, o presente trabalho objetivou estudar o efeito do consórcio de milho com B. brizantha em diferentes taxas de semeadura sobre a incidência de plantas daninhas. O experimento foi conduzido a campo em solo classificado como Latossolo Vermelho eutroférrico. O delineamento experimental utilizado foi de blocos ao acaso em esquema fatorial 4 x 2, sendo uma testemunha com milho solteiro, três densidades de semeadura de B. brizantha (7,5, 15 e 22,5 kg ha-1 de sementes) em consórcio com a cultura do milho, e dois períodos de avalia o da incidência de plantas daninhas na área, realizados 150 e 180 dias após a colheita do milho e desseca o da B. brizantha. Foi constatada oscila o na popula o de plantas daninhas entre as duas épocas de avalia o, enquanto as taxas crescentes de semeadura de braquiária proporcionaram redu o linear na popula o de plantas daninhas. Soil vegetation cover promoted by Brachiaria brizantha can reduce the incidence of weeds in the cropping area. Thus, the objective of the present study was to evaluate the effects of corn intercrop with Brachiaria brizantha in different sowing rates on the incidence of weeds. The experiment was carried out in a field experiment in a soil classified as an Oxisol. The experimental design was made in randomized blocks, with a factorial scheme 4 x 2, with one sole cropped corn as control, three B. brizantha (7.5, 15 and 22.5 kg ha-1) sowing rates, intercropped with corn crop, and two evaluation periods of weed incidence in the area, made at 150 and 180 days after the corn harvest and B. brizantha desiccation. The weed population varied in the two evaluation periods, while the increasing sowing rates of B. brizantha provided linear reduction in the weed population.
Plant density and nitrogen fertilization in Swiss chard
Echer, Márcia de M;Zoz, Tiago;Rossol, Charles Douglas;Steiner, Fábio;Castagnara, Deise D;Lana, Maria do C;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000400023
Abstract: an experiment was conducted to evaluate the effect of plant spacing and nitrogen fertilization on swiss chard's yield, from september to november 2009. the experimental design was of randomized blocks in split plot with four replications. in the plots were allocated the two plant spacings (0.30 and 0.50 m) and in the subplots the five doses of nitrogen (0, 40, 80, 120 and 160 kg ha-1). the crop was harvested 90 days after transplanting. the plant spacing of 0.50 m provided increased production of total fresh weight of shoot (961.7 g plant-1) and marketable (873.1 g plant-1). however, the highest total yield (77.8 t ha-1) and marketable (64.5 t ha-1) was achieved with the smaller spacing between plants (0.30 m). the n rates applied in coverage until 160 kg ha-1 increased in a linear form the total and marketable production of fresh mass of shoots, the total and marketable yield, the n content and the n accumulation in the shoots of swiss chard plants on the evaluated plant spacings.
Use of conditioning in the production of black and white oat hay using two cutting heights
Castagnara, Deise Dalazen;Neres, Marcela Abbado;Oliveira, Paulo Sérgio Rabello de;Meinerz, Cristiane Claudia;Mesquita, Eduardo Eustáquio;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000500002
Abstract: the study was conducted to estimate the dehydration curves, chemical composition, and occurrence of fungi in white oat hay (avena sativa l. cv. guapa brs) and black oat hay (avena strigosa schreb cv. common) at two cutting heights. dehydration curves were studied under a randomized block design with a 2 × 2 factorial arrangement using split plots in time, considering two types of oats (white and black), two cutting heights (10 and 20 cm), and 17 sampling times (0, 4, 19, 24, 28, 43, 47, 52, 67, 71, 76, 91, 95, 100, 115, 129, and 124 hours after harvesting) with five replicates. for the chemical composition and occurrence of fungi, the experimental design comprised randomized blocks in a factorial 2 × 2 split-plot in time with two types of oats, two cutting heights, and three assessment periods: before cutting, during baling, and after 30 days of storage, with five replicates. the hay obtained by cutting of the black and white oats at heights of 10 and 20 cm showed similar dehydration curves. the crude protein values were higher in white oats only at the time of cutting (141.5 g/kg). the black oats showed lower nutritional quality, with higher levels of adf and lignin. there was no effect of cutting height on the chemical composition, but the cutting height interfered with the production of dry matter and residue after cutting, with cutting at 10 cm leading to higher dry matter production and at 20 cm to increased waste production. the cutting heights of the oats interfere directly with the dry matter production and post-harvest residue without changing the chemical composition of the hay.
Use of conditioners in the production of Tifton 85 grass hay
Castagnara, Deise Dalazen;Ames, Jo?o Paulo;Neres, Marcela Abbado;Oliveira, Paulo Sérgio Rabello de;Silva, Francieli Batista;Mesquita, Eduardo Eustáquio;Stangarlin, José Renato;Franzener, Gilmar;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011001000003
Abstract: the objectives of this study were to estimate the curve of dehydration, bromatological composition and occurrence of fungi in tifton 85 grass, submitted to four methods of dehydration. the curves of dehydration were studied in a completely randomized design with a 4 × 11 factorial scheme with four drying systems (1 conditioning + 1 turn-over; 2 conditionings + 1 turn-over; no conditioning + 1 turn-over and no conditioning + 2 turn-overs) and 11 sampling times (0, 3, 15, 18, 21, 24, 39, 42, 45 and 47 hours after the cutting), with six replicates. for the bromatological composition and fungi occurrence, the experimental design was completely randomized in a 4 × 3 factorial scheme with the four drying methods of tifton 85 grass and three periods of evaluation (before the cutting, at the time of the baling and 30 days after storage) with six replicates. it was found that after the first hour after cutting and at the end of the period of dehydration, tifton 85 plants that were treated with conditioners showed higher levels of dry matter. stored hay that was treated with conditioners presented higher levels of acid detergent insoluble protein. until baling, the drying methods did not alter the crude protein content of hay; however, after storage, the hay submitted only to turn-over showed crude protein content higher (13.90%) than those submitted to conditioners (9.94%). there was an increase in the occurrence of fungi after storage, but the application of conditioners and one turn-over resulted in lower cuf/g, compared with other treatments, enhancing the effect of conditioners on accelerating the dehydration rate and obtaining better hay storage conditions
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