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Search Results: 1 - 10 of 78393 matches for " Carlos Alexandre Costa;Mauad "
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Dry matter and plant nutrition of upland rice under water deficit and silicon fertilization Produ o de massa seca e nutri o de cultivares de arroz de terras altas sob condi o de déficit hídrico e aduba o silicatada
Munir Mauad,Carlos Alexandre Costa Crusciol,Helio Grassi Filho
Semina : Ciências Agrárias , 2011,
Abstract: Although silicon has not been considered an essential element for plant growth and development, it has provided several benefits for the rice crop, especially under biotic and abiotic stress. The objective of this work was to evaluate macronutrient and silicon levels in upland rice cultivars cropped under water deficit and silicon fertilization. The experiment was carried out in greenhouse and the design was the completely randomized block, analyzed as a 2 x 2 x 2 factorial, which consisted of two cultivars, ‘Maravilha’ (modern group) and ‘Caiapó’ (traditional group), two silicon rates (0 and 350 kg ha-1) and two soil water tensions (-0.025 MPa and -0.050 MPa). Plant dry matter of the ‘Maravilha’ cultivar was higher compared to the other material. Higher soil water tensions decreased plant dry matter and macronutrient levels. Upland rice cultivars respond distinctively to soil water tensions and silicon rates. Embora n o seja considerado elemento essencial para o crescimento e desenvolvimento das plantas, o silício tem proporcionado diversos efeitos benéficos para cultura do arroz, em especial sob condi es de estresse biótico e abiótico. O objetivo deste trabalho foi avaliar os teores de macronutrientes e de silício, em cultivares de arroz de terras altas sob condi o de déficit hídrico e aduba o silicatada. O experimento foi desenvolvido em casa de vegeta o, em delineamento em blocos casualizados, em esquema fatorial 2 x 2 x 2, com duas cultivares: Maravilha (grupo moderno), e Caiapó (grupo tradicional), duas doses de silício (0 e 350 kg ha-1) e duas tens o de água no solo (-0,025 MPa e -0,050 MPa). A cultivar Maravilha produziu maior quantidade de massa seca do que a cultivar Caiapó. O aumento da tens o de água reduziu a produ o de massa seca e os teores de macronutrientes nas plantas de arroz Os cultivares de arroz apresentam resposta diferentes a tens o de água no solo e aduba o silicatada quanto ao teor de silício.
Doses de boro e crescimento radicular e da parte aérea de cultivares de arroz de terras altas
Corrêa, Juliano Corulli;Costa, André de Moraes;Crusciol, Carlos Alexandre Costa;Mauad, Munir;
Revista Brasileira de Ciência do Solo , 2006, DOI: 10.1590/S0100-06832006000600017
Abstract: appropriate boron (b) availability in soils favors root growth, and a sufficient supply of this micronutrient is very important for adequate rice development and yield in upland fields, depending on the cultivars and soil type. this study aimed at evaluating the influence of b addition on growth of roots and shoot of three upland rice cultivars. the experiment was carried out in a greenhouse, in 10 l pots containing 8 kg of an hapludox; the experiment was in a completely random 3 x 3 factorial design, with four replications. the treatments consisted of three rice cultivars (caiapó, primavera, and maravilha) and three b rates (0, 3 and 6 mg dm-3), as borax. the b rate of 6 mg dm-3 boron was deleterious to dry matter yield of both roots and shoot in upland rice. besides the greater absorption capacity, cultivar maravilha was more tolerant to high b doses in the soil, thus root length, diameter and surface were not negatively affected.
Matéria seca e morfologia radicular de cultivares de arroz de terras altas em fun??o da aduba??o com zinco
Mauad,Munir; Feltran,José Carlos; Crusciol,Carlos Alexandre Costa; Alvarez,Angêla Cristina Camarin;
Revista de Ciências Agrárias , 2012,
Abstract: the study aimed was to evaluate the upland rice cultivars behavior submitted to different levels of zinc, aiming to identify development alterations of the root system and the shoot. the experiment was carried in 8 dm-3 pots in greenhouse, up 64 days after the emergency of the plants. the experiment was design 4 x 3 completely randomized, consisted by four zinc levels (0, 4, 8 and 16 mg dm-3) and three upland rice cultivars (‘caiapó’, ‘maravilha’ and ‘primavera’) with four replications. the root diameter increased by the zn high level fertilization. length, surface and root volume did not influenced by the zinc levels. the cultivars of ‘caiapó’ traditional group and ‘primavera’ intermediate showed increased root lenght then the ‘maravilha’ modern group. cultivars with greater root lenght (‘caiapó’e ‘primavera’) demonstrated higher lever of zn levels in the shoot.
Matéria seca e morfologia radicular de cultivares de arroz de terras altas em fun o da aduba o com zinco Dry matter and root morphology of upland rice plants as a function of zinc fertilization
Munir Mauad,José Carlos Feltran,Carlos Alexandre Costa Crusciol,Angêla Cristina Camarin Alvarez
Revista de Ciências Agrárias , 2012,
Abstract: O objetivo do trabalho foi avaliar a influência da aduba o com zinco na matéria seca e morfologia do sistema radicular de cultivares de arroz de terras altas. O experimento foi conduzido em vasos contendo 8 dm3 de Latossolo Vermelho distroférrico, em casa de vegeta o, até 64 dias após a emergência das plantas. O delineamento experimental utilizado foi o de blocos casualizados, disposto em arranjo fatorial 4 x 3, quatro níveis de aduba o de zinco (0, 4, 8 e 16 mg dm-3) e três cultivares de arroz (‘Caiapó’, ‘Maravilha’ e ‘Primavera’), com quatro repeti es. O diametro radicular aumentou com o aumento da aduba o com Zn. Comprimento, superfície e volume radicular n o foram influenciados pelas doses de Zinco. As cultivares do grupo tradicional ‘Caiapó’ e intermediário ‘Primavera’ apresentaram maior comprimento radicular do que a cultivar do grupo moderno ‘Maravilha’. Cultivares com maior comprimento radicular (‘Caiapó’ e ‘Primavera’) exibiram maiores teores de Zn na parte aérea. The study aimed was to evaluate the upland rice cultivars behavior submitted to different levels of zinc, aiming to identify development alterations of the root system and the shoot. The experiment was carried in 8 dm-3 pots in greenhouse, up 64 days after the emergency of the plants. The experiment was design 4 x 3 completely randomized, consisted by four zinc levels (0, 4, 8 and 16 mg dm-3) and three upland rice cultivars (‘Caiapó’, ‘Maravilha’ and ‘Primavera’) with four replications. The root diameter increased by the Zn high level fertilization. Length, surface and root volume did not influenced by the zinc levels. The cultivars of ‘Caiapó’ traditional group and ‘Primavera’ intermediate showed increased root lenght then the ‘Maravilha’ modern group. Cultivars with greater root lenght (‘Caiapó’e ‘Primavera’) demonstrated higher lever of Zn levels in the shoot.
Corre??o da acidez e mobilidade de íons em Latossolo com aplica??o superficial de escória, lama cal, lodos de esgoto e calcário
Corrêa, Juliano Corulli;Büll, Leonardo Theodoro;Crusciol, Carlos Alexandre Costa;Marcelino, Rafael;Mauad, Munir;
Pesquisa Agropecuária Brasileira , 2007, DOI: 10.1590/S0100-204X2007000900013
Abstract: the experiment was carried out under field conditions in a no-tillage system from 2002 to 2005, aiming to evaluate liming, base saturation and nitrate, calcium and magnesium mobility in a dystrophic clay rhodic hapludox soil. the possible interference of organic acid catering of black oat through surface application of flue dust, aqueous lime and sewage sludge from a centrifuge and a biodigestor were also evaluated at rates of zero (control), 2, 4 and 8 t ha-1 as well as an additional treatment of dolomitic limestone at the rate of 2 t ha-1. due to the increasing surface applications of flue dust, aqueous lime and sewage sludge from a centrifuge, soil ph value increased; these three residues and the sewage sludge from a biodigestor increased base saturation and availability of nitrate, calcium and magnesium up to the depth of 40 cm and within three months only. the low concentration of organic acid in the aerial part of the black oat did not explain the quicky nutrient leaching and soil acidity neutralization in depth. flue dust, aqueous lime and sewage sludge from a centrifuge can be used as an acidity corrective and applied on the soil surface in no-tillage system.
Nitrogen and silicon fertilization of upland rice
Mauad, Munir;Crusciol, Carlos Alexandre Costa;Grassi Filho, Hélio;Corrêa, Juliano Corulli;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000400023
Abstract: silicon is not considered an essential element for plant development and growth, but its absorption brings several benefits to some crops, especially rice, by increasing cellular wall thickness, providing mechanical resistance to the penetration of fungi, improving the opening angle of leaves and making them more erect, decreasing self-shading and increasing resistance to lodging, especially under high nitrogen rates. to evaluate the effects of nitrogen and silicon fertilization on vegetative and yield components, plant height, and yield of rice cultivar iac 202, an experiment was carried out combining three nitrogen rates (5, 75 and 150 mg n kg-1 soil) applied as urea, and four silicon rates (0, 200, 400 and 600 mg sio2 kg-1 soil) applied as calcium silicate. trial was set up in a completely randomized design 3 ′ 4 factorial scheme, (n = 5). nitrogen fertilization increased the number of stems and panicles per square meter and the total number of spikelets, reflecting on grain productivity. excessive tillering caused by inadequate nitrogen fertilization reduced the percentage of fertile stalks, spikelet fertility and grain mass. silicon fertilization reduced the number of blank spikelets per panicles and increased grain mass, but did not affect grain productivity.
Efeito de escória de alto forno no crescimento radicular e na produtividade de arroz
Carvalho-Pupatto Juliana Garcia,Büll Leonardo Theodoro,Crusciol Carlos Alexandre Costa,Mauad Munir
Pesquisa Agropecuária Brasileira , 2003,
Abstract: A utiliza o agrícola de resíduos industriais como fertilizantes decorre da necessidade de diminuir o efeito nocivo do acúmulo de nutrientes nos centros de produ o. O objetivo deste trabalho foi avaliar os efeitos de escória de alto forno no crescimento radicular e na produtividade do arroz de terras altas irrigado por aspers o. O experimento foi realizado no campo, adotando-se o delineamento experimental de blocos casualizados, com cinco doses de escória de alto forno (0, 2.550, 5.100, 10.200 e 15.300 kg ha-1) com quatro repeti es. A utiliza o de escória melhorou a condi o química do solo, aumentou o crescimento e a superfície radicular, diminuiu o diametro das raízes e elevou os teores de silício no solo e na planta, resultando em aumento da produtividade.
Nitrogen and silicon fertilization of upland rice
Mauad Munir,Crusciol Carlos Alexandre Costa,Grassi Filho Hélio,Corrêa Juliano Corulli
Scientia Agricola , 2003,
Abstract: Silicon is not considered an essential element for plant development and growth, but its absorption brings several benefits to some crops, especially rice, by increasing cellular wall thickness, providing mechanical resistance to the penetration of fungi, improving the opening angle of leaves and making them more erect, decreasing self-shading and increasing resistance to lodging, especially under high nitrogen rates. To evaluate the effects of nitrogen and silicon fertilization on vegetative and yield components, plant height, and yield of rice cultivar IAC 202, an experiment was carried out combining three nitrogen rates (5, 75 and 150 mg N kg-1 soil) applied as urea, and four silicon rates (0, 200, 400 and 600 mg SiO2 kg-1 soil) applied as calcium silicate. Trial was set up in a completely randomized design 3 ′ 4 factorial scheme, (N = 5). Nitrogen fertilization increased the number of stems and panicles per square meter and the total number of spikelets, reflecting on grain productivity. Excessive tillering caused by inadequate nitrogen fertilization reduced the percentage of fertile stalks, spikelet fertility and grain mass. Silicon fertilization reduced the number of blank spikelets per panicles and increased grain mass, but did not affect grain productivity.
Doses de fósforo e crescimento radicular de cultivares de arroz de terras altas
Crusciol, Carlos Alexandre Costa;Mauad, Munir;Alvarez, Rita de Cassia Felix;Lima, Eduardo do Valle;Tiritan, Carlos Sérgio;
Bragantia , 2005, DOI: 10.1590/S0006-87052005000400014
Abstract: very little is known of phosphorus availability for upland rice. the objective of this work was to evaluate root growth of upland rice cultivars in different conditions of phosphorus availability. the experiment was carried out in greenhouse, in a completely randomized design, as a 4 x 4 factorial, with four doses of p (0, 50, 100 and 200 mg dm-3) and four cultivars: maravilha (modern group), iac 201, iac 202 and carajás (middle group). the carajás root system grew more in low availability of p than other cultivars. in low availability of p the cultivars iac 201 and iac 202 priorized root system growth to aerial growth . the maravilha cultivar needs high plevels to reach maximum growth. in low availability of p the upland rice cultivars decreased root diameter.
Efeito de escória de alto forno no crescimento radicular e na produtividade de arroz
Carvalho-Pupatto, Juliana Garcia;Büll, Leonardo Theodoro;Crusciol, Carlos Alexandre Costa;Mauad, Munir;Silva, Rosemeire Helena da;
Pesquisa Agropecuária Brasileira , 2003, DOI: 10.1590/S0100-204X2003001100011
Abstract: agricultural use of industrial residues as fertilizers is due to the need of reducing nutrient accumulation in centers of production. the objective of this study was to evaluate the effects of blast furnace slag on root growth and productivity of highland rice irrigated by sprinkler. the experiment was carried out on field conditions. the experimental design was a randomized block, with five rates of blast furnace (0, 2,550, 5,100, 10,200, and 15,300 kg ha-1) and four replications. use of the slag improved chemical attributes of the soil, increased root growth and surface and reduced root diameter. it increased the silicon content in the soil and in the plant, resulting in higher yield.
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