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Search Results: 1 - 10 of 9716 matches for " Gustavo Pavan;Crusciol "
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Composi??o físico-química e potencial para ensilagem do sorgo-de-guiné gigante em seis épocas de semeadura
Mateus, Gustavo Pavan;Crusciol, Carlos Alexandre Costa;Costa, Ciniro;
Pesquisa Agropecuária Brasileira , 2005, DOI: 10.1590/S0100-204X2005000900014
Abstract: the lack of alternative crops for fall-winter cultivation is a drawback in the utilization of agricultural production systems, especialy in regions with dry winters. the purpose of this study was to evaluate the potential of giant guinea sorghum (sorghum bicolor subsp. bicolor guinea race) for forage production, ensiling and plant chemical composition, in different sowing dates. the experimental design was a randomized block, with four replications, and six sowing dates. although sowing was late, giant guinea sorghum showed anticipation in development stages due to sensibility to photoperiod; its dry matter production was low, nevertheless the species presented a better quality of forage mass. due to the considerable capacity of dry matter production and ensiling potential, this species is a good option.
Palhada do sorgo de guiné gigante no estabelecimento de plantas daninhas em área de plantio direto
Mateus, Gustavo Pavan;Crusciol, Carlos Alexandre Costa;Negrisoli, Eduardo;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000600004
Abstract: crop residues on the surface of the soil can interfere in the infestation of weed of summer crops. the objective of this work was to evaluate the effect of the amount of gigantic guinea sorghum straw on the population of weed established in a no-tillage area. the experimental design used was the randomized blocks, with four replications. the treatments consisted of zero, 6,100, 7,100, 19,500, 26,700, 28,100 and 30,200 kg ha-1of guinea sorghum straw. soybean (cv. monsoy-6101) was seeded over the treatments in a density of 25 seeds m-1 and 0.45 m between lines. thirty days after the sowing of the culture, weedevaluation was accomplished. it consisted of four samplings per plot, through metallic frames of 1 m2. significant reduction of the number of weeds was verified with the increment of the straw. the control of weeds is superior to ninety percent, from 15,000 kg ha-1 on.
Efeito da palhada do sorgo de guiné “gigante” na nutri o foliar e produtividade da soja em plantio direto = Effect of “Gigante” Guinea sorghum straw on the leaf nutrition and production of soybean in no-tillage area
Gustavo Pavan Mateus,Carlos Alexandre Costa Crusciol,émerson Borghi
Acta Scientiarum : Agronomy , 2007,
Abstract: As conseqüências das altera es proporcionadas pela cobertura do solo, em sistema de plantio direto, no comportamento das culturas anuais, n o s o muito conhecidas. Com o objetivo de avaliar a absor o de nutrientes pela soja e seus reflexos na produtividade, em raz o de níveis de palha de sorgo na superfície, conduziu-se experimento em um Nitossolo Vermelho Estruturado, em Botucatu, Estado de S o Paulo. Os tratamentos, dispostos em blocos ao acaso, com 4 repeti es, constaram de 0; 6.100; 7.100; 19.500; 26.700; 28.100 e 30.200 kg ha-1 de palhada de sorgo de guiné “gigante”. O aumentoda palhada do sorgo de guiné “gigante” incrementou os teores foliares de N e de P até a quantidade de 25000 e 17500 kg ha-1 de palhada, respectivamente. Em sistema de plantio direto, a elevada produ o da soja, em decorrência do aumento da quantidade de palhada,relaciona-se à adequada absor o de nutrientes pela cultura em virtude, principalmente, da manuten o da umidade disponível no solo. The effects of cover plants on the performance of annual crops under no-tillage systems are not well defined yet. A field trial was carried out on a Rhodic Kandiudalf soil in Botucatu, state of S o Paulo, Brazil, aiming to evaluate the effect of the amount of Gigante guinea sorghum straw on soybean nutrient uptake and its consequent performance of grain yield in no-tillage area. The experimentaldesign was developed in randomized blocks with four replications. The treatments consisted of 6.1, 7.1, 19.5, 26.7, 28.1 e 30.2 ton ha-1 of guinea sorghum straw. The increase of straw provided increment of N and P plant levels until the amount of 25.0 and 17.5 ton ha-1, respectively. Thus, the highest soybean grain yields reported in soils under no-tillage systems might be related to the proper water and nutrient uptakes due to higher soil moisture availability.
Biomass production and accumulation of nutrients in shoots of Giant Guinea sorghum plants
Mateus, Gustavo Pavan;Borghi, émerson;Castro, Gustavo Spadotti Amaral;Garcia, Rodrigo Arroyo;Crusciol, Carlos Alexandre Costa;
Revista Ciência Agron?mica , 2011, DOI: 10.1590/S1806-66902011000400024
Abstract: choosing species with high phytomass production to be cropped in no tillage system is extremely important in dry winter regions. the purpose of this research was to study plant biomass production and accumulation of nutrients in shoots of giant guinea sorghum plants (sorghum bicolor subspecies bicolor race guinea) sown in different sowing dates. a randomized complete block design with six treatments and four replications was performed. treatments consisted of six sowing dates (09/25/2000; 10/25/2000; 11/24/2000; 12/22/2000; 02/22/2001 and 04/03/2001). at flowering, dry matter production, number and diameter of stems and plant height were evaluated. macro and micronutrient levels and accumulation were determined as well as c/n ratio. plant cycle decreased as sowing date was delayed and, consequently, dry matter production and c/n ratio decreased as well. the opposite was observed for nutrient contents. "giant guinea" sorghum is sensitive to photoperiod thus late sowing reduces plant development, which leads to low biomass production and nutrient accumulation. "giant guinea" sorghum cultivated as cover crop is a good option when implementing no tillage system due to high dry matter production and n, p, and k recycling.
Participa??o do colmo principal e dos afilhos na produtividade do arroz irrigado, em fun??o da densidade de semeadura
Lima, Eduardo do Valle;Crusciol, Carlos Alexandre Costa;Mateus, Gustavo Pavan;
Bragantia , 2010, DOI: 10.1590/S0006-87052010000200018
Abstract: this study aimed to evaluate the participation of the main stem and tillers of cv. iac 102 rice in grain productivity, under flood irrigation, as a function of seeding density. the experiment was conducted under a plastic tunnel at fca/unesp-botucatu, s?o paulo state, brazil, in 500-l capacity asbestos cement-water tanks containing a 30 cm layer of a typic udifluvent soil. the experimental design was a completely randomized setup, with four replicates. seeding densities were 100, 200, 300, 400, 500, and 600 viable seeds per m2, in four 1m-long rows per tank, spaced at 20 cm. tillering decreased as seeding density increased, with greater participation of the main stems; however, this did not result in increased yield, due to the plasticity shown by rice plants, which yield components to adjust accordingly.
Grain quality of upland rice cultivars in response to cropping systems in the Brazilian tropical savanna
Crusciol, Carlos Alexandre Costa;Arf, Orivaldo;Soratto, Rogério Peres;Mateus, Gustavo Pavan;
Scientia Agricola , 2008, DOI: 10.1590/S0103-90162008000500004
Abstract: the industrial quality of grain is an important parameter to determine the commercial value of rice and can be influenced by water availability and type of cultivar. the present study aimed to evaluate the milling yield as well as the protein and nutrient contents of polished grains originated from two upland rice cultivars grown under rainfed and sprinkler-irrigated conditions. a randomized block design was used in a split-plot arrangement with eight replicates. plots consisted of two cropping systems (rainfed and sprinkler-irrigated) with subplots consisting of two cultivars recommended for upland ecosystems (iac 201 and carajás). the sprinkler irrigation system increased upland rice milling (8.0%) and head rice yield (23.7%), for years with hot and dry weather spells occurring during the reproductive and maturation stages. under conditions of lower water availability, the carajás cultivar showed a milled yield value 5.1% higher than that of cultivar iac 201. lower water availability provided increases in protein, n, p, ca, mg, fe, and zn contents but reductions in s and cu in the polished grains. cultivars iac 201 and carajás had similar nutrient contents in the polished grains.
Fontes e períodos de contato de fertilizantes e germina??o de sementes de Brachiaria brizantha
Mateus, Gustavo Pavan;Borghi, émerson;Marques, Rúbia Renata;B?as, Roberto Lyra Villas;Crusciol, Carlos Alexandre Costa;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000100018
Abstract: the mixture of forage seeds with mineral fertilizers can make intercropping systems possible by reducing competition with the grain-producing crop. however, if the mixture is prepared too early before sowing, the emergence and establishment of the forages can be negatively affected. therefore, experiment were carried out in laboratory and greenhouse conditions, in botucatu, s?o paulo, to evaluate brachiaria brizantha seed germination as related to the time of contact with distinct chemical fertilizers. the experiment had a completely randomized block design, in a 6 x 8 factorial scheme, with six contact periods of brachiaria brizantha cv. marandu seeds (0, 6, 12, 24, 48, and 96 hours), with eight chemical fertilizers (urea, ammonium sulphate, potassium chloride, potassium sulphate, simple superphosphate, triple superphosphate, npk 8-28-16 mixture as a mixture of granules or powder), in four replications. there was no relation between the germination tests under laboratory with that under field conditions. under field conditions, brachiaria brizantha plant emergence is not affected if the phosphate fertilizers, potassium chloride and formulated npk powder are mixed with the seeds up to 96 h before sowing.
Aduba??o nitrogenada de sorgo granífero consorciado com capim em sistema de plantio direto
Mateus, Gustavo Pavan;Crusciol, Carlos Alexandre Costa;Borghi, émerson;Pariz, Cristiano Magalh?es;Costa, Ciniro;Silveira, Jo?o Paulo Franco da;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011001000007
Abstract: the objective of this work was to evaluate the effect of nitrogen fertilization management on single and intercropped sorghum with marandu and momba?a grasses, and to determine the forage dry weight yield in the 2003/2004 and 2004/2005, in a no-tillage system. the experimental design was in randomized block, in a 3x5 factorial arrangement, with four replicates. the treatments consisted of three sorghum cropping systems (single and intercropped with marandu and momba?a grasses in the rows) and five nitrogen fertilizer managements: 30-70; 70-30; 50-50; 100-0; and 0-100 kg ha-1 of n, applied at sowing and topdressing, respectively. intercropping did not affect sorghum nutrition nor grain yield. only in the first growth season, the 50-50 kg ha-1 of n splitting increased grain yield. straw management interfered in sorghum establishment during the second growth season and decreased grain yield. the highest rates of n topdressing increased forage dry weight yield of marandu grass and, applied at sowing, n highest rates increased this attribute in momba?a grass.
Nutri??o e produtividade de híbridos de sorgo granífero de ciclos contrastantes consorciados com capim-marandu
Crusciol, Carlos Alexandre Costa;Mateus, Gustavo Pavan;Pariz, Cristiano Magalh?es;Borghi, émerson;Costa, Ciniro;Silveira, Jo?o Paulo Franco da;
Pesquisa Agropecuária Brasileira , 2011, DOI: 10.1590/S0100-204X2011001000017
Abstract: the objective of this work was to evaluate the effect of the intercropping with marandu grass on the nutrition and yield of sorghum hybrids with contrasting-cycle, in no-tillage system. it was used a randomized block experimental design in a factorial arrangement (2x2), with six replicates. the treatments consisted of two sorghum hybrids with contrasting cycles (p8118, medium cycle; and p8419, early cycle) and two crop systems (single and intercropped with marandu grass in the seed row), with the seeding done in the early december. nutrition, agronomic traits, production components, and dry matter and grain yields of the sorghum hybrids were evaluated. except for potassium and sulphur, the leaf contents of the other nutrients were appropriate in all treatments for sorghum cropping. the hybrid p8118 had the highest grain yield and, after the intercropping, it contributed for the highest forage dry matter yield of marandu grass in the cut performed in october. the intercropping of contrasting-cycle sorghum hybrids and marandu grass does not affect sorghum nutrition, and dry matter and grain yields, in comparison with the single cropping, irrespectively of the hybrid cycle.
Perdas de cloreto de mepiquat no algodoeiro por chuva simulada
Mateus, Gustavo Pavan;Lima, Eduardo do Valle;Rosolem, Ciro Antonio;
Pesquisa Agropecuária Brasileira , 2004, DOI: 10.1590/S0100-204X2004000700003
Abstract: brazilian cotton production is located in regions in which pluvial precipitation indexes are around 2,000 mm per year. growth regulator application in conditions under such indices can make product to be washed before being absorbed by the plants. the objective of this research was to evaluate the effect of mepiquat chloride wash by simulated rain occurring at different times after the product application on cotton plants. the experiment was accomplished in greenhouse conditions, in pots of 12 l with three cotton plants cv. deltaopal. mepiquat chloride was sprayed at pin-head square, at 12.5 g ha-1 a.i. treatments consisted on two simulated rainfalls intensity (10 and 20 mm) at 0, 2, 4, 8, 16 and 32 hours after the product application and a treatment without rain, with four replications. a 10 mm rain was enough to wash the product from cotton leaves irrespectively of the time after application of the regulator. if there is rain 0, 2, 4, 8, 16 or 32 hours after product application, it should be reapplied 131, 125, 120, 110, 93 and 70 ml ha-1, respectively.
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