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Search Results: 1 - 10 of 194125 matches for " Cristiane de Conti;Santos "
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Matéria seca, carbono e nitrogênio de raízes de soja e milho em plantio direto e convencional
Bordin, Ivan;Neves, Carmen Silvia Vieira Janeiro;Medina, Cristiane de Conti;Santos, Julio Cezar Franchini dos;Torres, Eleno;Urquiaga, Segundo;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008001200020
Abstract: the objective of this work was to examine whether soil tillage systems affect the distribution and accumulation of dry matter (dm), carbon (c) and nitrogen (n) of root systems of soybean (glycine max) and corn (zea mays) in a clayey typic haplorthox. volumetric rings were used for root sampling down to 1 m depth. the distribution in depth and accumulation of dm, c and n of soybean and corn roots were not affected by soil tillage systems. root length density was 0.7-1.4 cm cm-3 for soybean and 1.2-1.6 cm cm-3 for corn in the 0-0.10 m layer and decreased in the other layers. root dm input was 1.94-2.01 mg ha-1 in soybean and 2.50-3.79 mg ha-1 in corn. for soybean, c and n root inputs were 0.61-0.63 mg ha-1 and 36.9-38.2 kg ha-1, respectively. for corn, c and n root inputs were 0.72-1.10 mg ha-1 and 18.78-28.48 kg ha-1, respectively. independently of the tillage system, 80% of the roots were concentrated in the upper surface layer 0.43 to 0.54 m deep for soybean and in the upper surface layer 0.40 to 0.46 m deep for corn.
Sugarcane root length density and distribution from root intersection counting on a trench-profile
Azevedo, Mateus Carvalho Basilio de;Chopart, Jean Louis;Medina, Cristiane de Conti;
Scientia Agricola , 2011, DOI: 10.1590/S0103-90162011000100014
Abstract: root length density (rld) is a critical feature in determining crops potential to uptake water and nutrients, but it is difficult to be measured. no standard method is currently available for assessing rld in the soil. in this study, an in situ method used for other crops for studying root length density and distribution was tested for sugarcane (saccharum spp.). this method involved root intersection counting (ric) on a rhodic eutrudox profile using grids with 0.05 x 0.05 m and modeling rld from ric. the results were compared to a conventional soil core-sampled method (cor) (volume 0.00043 m3). at four dates of the cropping season in three tillage treatments (plowing soil, minimum tillage and direct planting), with eight soil depths divided in 0.1 m soil layer (between 0-0.6 and 1.6-1.8 m) and three horizontal distances from the row (0-0.23, 0.23-0.46 and 0.46-0.69 m), cor and ric methods presented similar rld results. a positive relationship between cor and ric was found (r2 = 0.76). the rld profiles considering the average of the three row distances per depth obtained using cor and ric (mean of four dates and 12 replications) were close and did not differ at each depth of 0.1 m within a total depth of 0.6 m. total rld between 0 and 0.6 m was 7.300 and 7.100 m m-2 for cor and ric respectively. for time consumption, the ric method was tenfold less time-consuming than cor and ric can be carried out in the field with no need to remove soil samples. the rld distribution in depth and row distance (2-d variability) by ric can be assessed in relation to the soil properties in the same soil profiles. the ric method was suitable for studying these 2-d (depth and row distance in the soil profile) relationships between soil, tillage and root distribution in the field.
Caracteriza??o de agregados em um Latossolo Vermelho distroférrico típico submetido a diferentes doses de vinha?a
Passarin, Amarildo Luiz;Rodrigueiro, Edinei Luis;Robaina, Carla Renata Pazzotti;Medina, Cristiane de Conti;
Revista Brasileira de Ciência do Solo , 2007, DOI: 10.1590/S0100-06832007000600004
Abstract: the size distribution, the quantity and stability of soil aggregates are important parameters to evaluate the soil structure, which plays a relevant role in soil-plant relationships. vinasse when applied on soil stimulates microbial activity because of its organic matter content. this activity may increase mucilage production and improve the aggregation and soil structural stability. the objective of this study was to evaluate the aggregate stability in an oxisol treated with different vinasse doses. the study was carried out at the londrina state university exerimental farm from august 1997 to august 1999, in randomized blocks, with five treatments (vinasse doses) and four replications. the soil samples were collected in four soil layers (0-10, 10-20, 20-30 and 30-40 cm). the evaluations of this study were carried out at the fifth harvest (fourth ratoon), in august 1999. vinasse was applied at 0, 150, 300, 450 and 600 m3 ha-1 and the following aggregation indices were determined: ponderate middle diameter (pmd), geometrical middle diameter (gmd) and aggregate stability index (asi). the results showed that different vinasse doses did not significantly alter the aggregation indices of the different depths studied.
Agricultural and industrial yields of sugar cane submitted to vinasse rates/ Produ es agrícola e industrial de cana-de-a úcar submetida a doses de vinha a
Aline Fagote Paulino,Cristiane de Conti Medina,Carla Renata Pazotti Robaina,Raffael Alberto Laurani
Semina : Ciências Agrárias , 2002,
Abstract: This study was carried out to assess the influence of vinasse rates on the agricultural and industrial yields of sugar cane. The experiment was set up at the School Farm of the State University of Londrina, in “Latossolo Vermelho” soil (Oxisol), between 1994 and 1999, in a randomized block design with four replications. Treatments were based of five rates of vinasse applied to the soil: T1 = 0 m3 ha-1, T2 = 150 m3 ha-1, T3 = 300 m3 ha-1, T4 = 450 m3 ha-1, T5 = 600 m3 ha-1. This study is accomplishes the fourth and the fifth harvesting (3a and 4a stump) and the following parameters were evaluated: agricultural (ton ha-1) and industrial yield (ton ha-1 of sugar and m3 ha-1 of alcohol). The results showed that the intermediary rates (300 and 450 m3 ha-1) gave provided better results for agricultural and industrial yield. O objetivo deste trabalho foi avaliar a influência de doses de vinha a nas produ es agrícola e industrial da cana-de-a úcar. O ensaio foi conduzido na Fazenda Escola da Universidade Estadual de Londrina, em Latossolo Vermelho, no período de 1994 a 1999, com delineamento em blocos ao acaso. Os tratamentos constituíram-se de 5 doses de vinha a: T1 = 0 m3 ha-1, T2 = 150 m3 ha-1, T3 = 300 m3 ha-1, T4 = 450 m3 ha-1, T5 = 600 m3 ha-1, e 4 repeti es por tratamento. Para o presente trabalho foram utilizados dados referentes às 4a e 5a colheitas (3a e 4a socas), sendo avaliadas as produtividades agrícola (t ha-1) e industrial (t a úcar ha-1 e m3 álcool ha-1). Utilizou-se a análise de regress o para os dados. Os resultados mostraram que as doses intermediárias de vinha a (300 e 450 m3 ha-1) geraram os melhores índices de produtividades agrícola e industrial.
Root system of West Indian cherry plants propagated by seeds and cuttings/ Sistema radicular de aceroleiras propagadas por sementes e por estacas
Carmen Silvia Vieira Janeiro Neves,Neusa Maria Colauto Stenzel,Cristiane de Conti Medina,Ives Massanori Murata
Semina : Ciências Agrárias , 2004,
Abstract: This research work had as objective to evaluate and to compare the amount and the distribution of the roots of 4.5 years old West Indian Cherry plants, in a clayey Typic Hapludox, propagated by: a) seeds (and subsequent grafting); b) cuttings. It was used the trench profile method, in the planting rows and in the inter-rows, covering half spacing. Images of 25 x 25 cm were taken in the trenches and evaluated with the SIARCS program. The density of fine ( 0.5 cm of diameter) were assessed. There was no difference between the two propagation systems for the density of fine roots in the planting row. The plants propagated by cuttings presented larger density of fine roots in the depth 0-0.25 m; and plants propagated by seeds showed more roots in the depths 0.25-0.50 and 0.50-0.75 m in the inter-row. The plants propagated by seeds presented larger density of thick roots than plants propagated by cuttings in the layers 0-0.25 and 0.25-0.50 m in the row and in the general density of roots (row + inter-row). O trabalho teve o objetivo de avaliar e comparar a quantidade e a distribui o das raízes de plantas de aceroleira (Malpighia emarginata) com 4,5 anos de idade, em Latossolo Vermelho distroférrico, propagadas por: a) semeadura, e posterior enxertia; b) estaquia. Para a avalia o das raízes utilizou-se o método da trincheira, aberta em duas dire es: na linha e na entrelinha, até metade do espa amento entre plantas. Nas trincheiras foram tomadas imagens de 25 x 25 cm e avaliadas com o programa SIARCS. Foi avaliada a densidade de raízes finas (< 0,5 cm de diametro) e de raízes grossas (> 0,5 cm de diametro) por área de trincheira. N o houve diferen a entre os dois sistemas de propaga o, na linha de plantio, para a densidade de raízes finas. Na entrelinha, as plantas propagadas por estaca apresentaram maior densidade de raízes finas na profundidade 0-0,25 m, enquanto que nas propagadas por semente apresentaram mais raízes finas nas profundidades 0,25-0,50 e 0,50-0,75 m. Para as raízes grossas, as plantas propagadas por semente apresentaram maior densidade que o tratamento estaca na linha de plantio para as profundidades 0,00-0,25 e 0,25-0,50 m e na média geral da densidade de raízes (linha + entrelinha).
Root distribution of rootstocks for 'Tahiti' lime
Neves Carmen Silvia Vieira Janeiro,Murata Ives Massanori,Stenzel Neusa Maria Colauto,Medina Cristiane de Conti
Scientia Agricola , 2004,
Abstract: Field studies on citrus roots are important for genetic selection of cultivars and for management practices such as localized irrigation and fertilization. To characterize root systems of six rootstocks, taking into consideration chemical and physical characteristics of a clayey Typic Hapludox of the Northern State of Paraná, this study was performed having as scion the 'IAC-5 Tahiti' lime [Citrus latifolia (Yu. Tanaka)]. The rootstocks 'Rangpur' lime (C. limonia Osbeck), 'Africa Rough' lemon (C. jambhiri Lush.), 'Sunki' mandarin [C. sunki (Hayata) hort. ex Tan.], Poncirus trifoliata (L.) Raf., 'C13' citrange [C. sinensis (L.) Osb. x P. trifoliata (L.) Raf] and 'Catania 2' Volkamer lemon (C. volkameriana Ten. & Pasq.) were used applying the trench profile method and the SIARCS 3.0 software to determine root distribution. 'C-13' citrange had the largest root system. 'Volkamer' lemon and 'Africa Rough' lemon presented the smallest amount of roots. The effective depth for 80 % of roots was 31-53 cm in rows and 67-68 cm in inter-rows. The effective distance of 80 % of roots measured from the tree trunk exceeded the tree canopy for P. trifoliata, 'Sunki' mandarin, and 'Volkamer' and 'Africa Rough' lemons.
Enterobacteriaceae and pseudomonadaceae on the dorsum of the human tongue
Conti, Simone;Santos, Silvana Soléo Ferreira dos;Koga-Ito, Cristiane Yumi;Jorge, Antonio Olavo Cardoso;
Journal of Applied Oral Science , 2009, DOI: 10.1590/S1678-77572009000500005
Abstract: objective: the aim of this study was to correlate the presence of enterobacteriaceae, pseudomonadaceae, moraxellaceae and xanthomonadaceae on the posterior dorsum of the human tongue with the presence of tongue coating, gender, age, smoking habit and denture use. material and methods: bacteria were isolated from the posterior tongue dorsum of 100 individuals in macconkey agar medium and were identified by the api 20e system (biolab-mérieux). results: 43% of the individuals, presented the target microorganisms on the tongue dorsum, with greater prevalence among individuals between 40 and 50 years of age (p = 0.001) and non-smokers (p=0.0485). conclusions: a higher prevalence of enterobacteriaceae and pseudomonadaceae was observed on the tongue dorsum of the individuals evaluated. there was no correlation between these species and the presence and thickness of tongue coating, gender and presence of dentures.
Comparison of citrus rooting evaluation methods using root images in soil profiles and root weight
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000001200025
Abstract: a digitized image method was compared with a standard washing technique for measuring citrus roots in the field. video pictures of roots were taken in a soil profile. the profile area analyzed was defined by iron rings, which were also used to remove the roots to determine their dry weight. the roots presented in the pictures were quantified using siarcs software developed by embrapa. the root length and area determined by digital images provided a good estimate of root quantity present in the profile.
Soil physical properties and sugarcane root growth in a red oxiso
Baquero, José Euripides;Ralisch, Ricardo;Medina, Cristiane de Conti;Tavares Filho, Jo?o;Guimar?es, Maria de Fátima;
Revista Brasileira de Ciência do Solo , 2012, DOI: 10.1590/S0100-06832012000100007
Abstract: sugarcane, which involves the use of agricultural machinery in all crop stages, from soil preparation to harvest, is currently one of the most relevant crops for agribusiness in brazil. the purpose of this study was to investigate soil physical properties and root growth in a eutroferric red oxisol (latossolo vermelho eutroférrico) after different periods under sugarcane. the study was carried out in a cane plantation in rolandia, paraná state, where treatments consisted of a number of cuts (1, 3, 8, 10 and 16), harvested as green and burned sugarcane, at which soil bulk density, macro and microporosity, penetration resistance, as well as root length, density and area were determined. results showed that sugarcane management practices lead to alterations in soil penetration resistance, bulk density and porosity, compared to native forest soil. these alterations in soil physical characteristics impede the full growth of the sugarcane root system beneath 10 cm, in all growing seasons analyzed.
Efeitos de substratos e recipientes utilizados na produ??o das mudas sobre a arquitetura do sistema radicular de árvores de cácia-negra
Neves, Carmen Silvia Vieira Janeiro;Medina, Cristiane de Conti;Azevedo, Mateus Carvalho Basilio de;Higa, Antonio R.;Simon, Augusto;
Revista árvore , 2005, DOI: 10.1590/S0100-67622005000600008
Abstract: the objective of this study was to characterize the architecture of the root system of black wattle trees (acacia mearnsii), three years after planting, in relation to eight types of containers and six substrata used in the nursery, considering chemical and physical conditions of the soil. the experiment was carried out in cristal (rs), in a podzolic dark red soil. the soil presented high density, low ph and excess of aluminum. the treatment that induced larger root development was fertil-pot with fertilized soil, which differed significantly from the treatments round plug, with fertilized soil + acacia exhausted bark + vermiculite; paper pot, with fertilized soil and laminated in wood box, with fertilized soil. the development and the architecture of the roots in the field was affected by the container but not by the substrata used in the nursery.
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