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Phosphorus use efficiency of upland rice cultivars on Cerrado soil / Eficiência no uso de fósforo de cultivares de arroz em solos de Cerrado
Eduardo Lopes Cancellier,Diogo Ribeiro Brand？o,Joedna Silva,Manoel Mota dos Santos
Ambiência , 2012,
Abstract: ResumoRice (Oryza sativa L.) is one of the most economically important cereal in developing countries and the phosphorus is the most deficient nutrient in the majority of Brazilian soils because their low natural level and high adsorption capacity, therefore it is a crop limiting factor. Rice cultivars have differentiated nutritional requests and tolerances about stress of essential nutrients. This work aimed to evaluate the efficiency about use and response to phosphorus application in upland rice cultivars (BRS-Primavera, BRS-Caiapó, BRSMG-Curinga, BRSMG-Conai, BRS-Sertaneja, BRS-Bonan a and Epagri-109) in Cerrado soil. To simulate environments with low and high phosphorus levels were utilized levels of 20 and 120 kg ha-1 of P2O5 respectively. The experimental data were submitted to individual and joint analysis of variance applying the F test. Phosphorus influenced each cultivar differently and were not identified efficient cultivars about use and responsive to its application. The cultivars Epagri-109, BRS-Sertaneja and BRSMG-Conai are indicated to farming systems with high level of phosphorus. The cultivars BRS-Bonan a, BRSMG-Curinga, BRS-Primavera and BRS-Caiapó are indicated to farming systems with low level of phosphorus.
Eficiência no uso de fósforo de variedades de arroz cultivadas em solos de várzea irrigada
Rotili, Eliane Aparecida;Fidelis, Rodrigo Ribeiro;Santos, Manoel Mota dos;Castro Neto, Manoel Delintro de;Kichel, Elisangela;Cancellier, Eduardo Lopes;
Revista Ceres , 2010, DOI: 10.1590/S0034-737X2010000300019
Abstract: rice stands out as one of the most important crops in the world, because of its easy adaptability to distinct edaphoclimatic conditions. rice is cultivated and consumed worldwide and stands out by the large production and cultivation area, playing strategic economic and social roles. in brasil, the largest rice productions are obtained in lowland ecosystems. this work aimed to study the efficiency in phosphorus use by rice varieties in lowland areas in the southwest of tocantins state. the treatments involved eight rice commercial varieties (brs-ja？an？, best-2000, brs-guará, brs-alvorada, bra-01381, an-cambará, brs 7-taim and epagri-109), which were farmed in two distinct environments. in order to simulate environments with low and high phosphorus levels, p2o5 was used at the levels of 20 and 120 kg ha-1 respectively. the experiments were carried out in a randomized complete blocks design, with four replications. grain yield was used to classify the varieties regarding the efficiency in use and response to phosphorus application. was shown that only the variety brs-alvorada was efficient in using phosphorus and responsive to its application.
Efeito do Nitrogênio em genótipos de arroz cultivados em várzea úmida do Estado do Tocantins
Kischel, Elisangela;Fidelis, Rodrigo Ribeiro;Santos, Manoel Mota dos;Brand？o, Diogo Ribeiro;Cancellier, Eduardo Lopes;Nascimento, Ildon Rodrigues do;
Revista Ceres , 2011, DOI: 10.1590/S0034-737X2011000100013
Abstract: the rice crop demands high nutrient input. in most areas where rice is cultivated, nitrogen is the main limiting factor to yield and nitrogen fertilization represents the largest fraction of the total production cost. this study aimed to assess the effect of low and high nitrogen rates on flooded rice cultivars sown in a lowland soil without a controlled flooding system. nine flooded rice cultivars were used in the experiment: brs-ja？an？, metica-1, best-2000, brsgo-guará, brs-alvorada, bra-01381, an-cambará, brs7-taim and epagri-109. nitrogen at the rates of 20 and 120 kg ha-1 were used to simulate environments of low and high n levels, respectively. the following characteristics were evaluated: plants height, grain yield and 100-grain mass. genotype epagri-109 was the best statistic group for both low and high nitrogen levels and the environment with high nitrogen level produced the highest plant heights.
Eficiência agron mica no uso de nitrogênio mineral por cultivares de arroz de terras altas Agronomic efficiency of mineral nitrogen by upland rice cultivars
Eduardo L. Cancellier,Hélio B. Barros,Elisangela Kischel,Luiz A. de M. Gonzaga
Revista Brasileira de Ciências Agrárias , 2011, DOI: 10.5039/agraria.v6i4a1420
Abstract: O arroz é considerado um dos cereais de maior importancia econ mica em países em desenvolvimento, sendo bastante exigente em nutrientes, principalmente o nitrogênio. Por esta raz o, a sele o de genótipos com maior eficiência na utiliza o de nitrogênio mineral é considerada, atualmente, uma das maneiras mais adequadas para diminuir o custo de produ o da cultura do arroz. O objetivo deste trabalho foi verificar a existência de diferen as entre variedades melhoradas de arroz quanto à eficiência no uso de nitrogênio em solos de terras altas. A avalia o das cultivares foi conduzida em dois experimentos, sob baixa e alta dose de nitrogênio mineral, utilizando um delineamento experimental em blocos casualizados, com quatro repeti es. Para simular os ambientes com baixo e alto nível de nitrogênio, foram utilizadas, respectivamente, doses de 20 e 120 kg ha-1 de N. As cultivares BRS-Primavera e BRSMG-Conai foram eficientes e responsivas à aduba o de N sendo, portanto, indicadas para cultivo com qualquer nível de aduba o, no sul do estado do Tocantins. As maiores produtividades est o relacionadas aos maiores índices de clorofila e às menores rela es entre os índices de clorofila a e b. Rice is one of the most important cereals in the economy of developing countries, being highly demanding for nutrients, especially nitrogen. Thus, the selection of highly efficient rice genotypes in mineral nitrogen use is currently considered one of the most appropriate ways to decrease rice crop production costs. The aim of this work was to verify the existence of differences between improved rice varieties in terms of nitrogen use efficiency in upland soils. The cultivars evaluation was carried out in two environments, with low and high nitrogen rates. The experiment was carried out in randomized block design with four replications. To simulate the environments with low and high nitrogen rates, 20 and 120 kg ha-1 of N were applied, respectively. The cultivars BRS-Primavera and BRSMG-Conai had high agronomic efficiency and response to N fertilization and, therefore, are recommended for cultivation with any level of fertilization in the South region of the State of Tocantins. The highest yields are related to the highest chlorophyll indexes and the lowest ratios between chlorophyll indexes a and b.
Divergência genética em genótipos de milho, no estado do Tocantins
Rotili, Eliane Aparecida;Cancellier, Leandro Lopes;Dotto, Michel Ant？nio;Peluzio, Joênes Mucci;Carvalho, Edmar Vinícius de;
Revista Ciência Agron？mica , 2012, DOI: 10.1590/S1806-66902012000300014
Abstract: this study aimed to evaluate the genetic diversity in maize genotypes in the southern of tocantins. the experiment was conducted at gurupi - to, brazil. the populations were obtained from 70 top cross, with crossing the lineages s6 with a tester, and using 11 cultivars as a witness, totaling 81 genotypes. the experimental design was randomized blocks with two replications. the characteristics assessed were: plant height, ear height, prolificacy, ear length, ear diameter, weight of 100 grains, hectoliter weight and grain yield. genetic divergence was assessed by multivariate procedures: mahalanobis distance, clustering methods of tocher and nearest neighbor. it was found genetic divergence among populations and the formation of non congruent groups between the method of tocher and nearest neighbor. the yield grain was the major contributor to the genetic diversity and the ear length was the least.
Organic fertilizer in the line sowing in maize growth and yield Aduba o organica na linha de semeadura no desenvolvimento e produtividade do milho
Leandro Lopes Cancellier,Flávio Sérgio Afférri,Gentil Cavalheiro Adorian,Hugo Valério Moreira Rodrigues
Semina : Ciências Agrárias , 2011,
Abstract: The combined use of chemical fertilizers and organic materials have been recommended as alternative management, enabling the maintenance of high yields and stability. This study aimed to evaluate the influence of levels of manure applied in the row, with and without nitrogen application, in maize development and yield. The experiment was installed in Gurupi - TO, on March 6, 2009. The experimental design was randomized blocks in factorial scheme 8x2, where were used seven levels of manure (0.0; 10.0; 20.0; 30.0; 40.0; 50.0 and 60.0 t ha-1) and one treatment with chemical fertilizer and the second factor were two levels of nitrogen after planting. Were evaluating plants height weekly, from 15 to 57 days after emergency. Was evaluated final plant height, green matter and grain yield. Highest levels of manure led to significant increases in the evaluated characteristics. Nitrogen fertilization after planting promoted increase in grown rate, green mass and final plant height, even with the addition of organic manure. The manure application of 50 t ha-1 without of nitrogen after planting showed equivalent productivity to chemical fertilizer, however, with application of nitrogen after planting in the equivalent manure level was 45.4 t ha-1. When not applied nitrogen after planting, the chemical fertilizer produced grains and green mass equivalent to the highest manure levels, but application of nitrogen after planting in highest manure levels provided yield higher than chemical fertilizer. O uso combinado de fertilizantes químicos e materiais organicos têm sido recomendados como manejo alternativo, possibilitando a manuten o de altas produtividades com estabilidade de produ o. Este trabalho teve como objetivo avaliar a influência de diferentes doses de esterco bovino aplicados na linha de semeadura, com e sem aplica o de nitrogênio em cobertura, no desenvolvimento e produtividade do milho. O experimento foi instalado no Campus experimental da UFT em Gurupi - TO, no dia seis de mar o de 2009. O delineamento experimental foi em blocos ao acaso em esquema fatorial 8x2, utilizando-se sete doses de esterco (0,0; 10,0; 20,0; 30,0; 40,0; 50,0 e 60,0 t ha-1) e um tratamento químico testemunha e, como segundo fator duas doses de nitrogênio em cobertura. Foram realizadas avalia es semanais de altura de plantas dos 15 aos 57 dias após a emergência. Foram avaliadas altura de plantas final, massa verde e produtividade de gr os. As maiores doses de esterco promovem aumentos significativos nas características avaliadas. O nitrogênio em cobertura promoveu aumentos nas t
SITEM - Sistema Integrado de Engenharia e Gest？o da Manunten？？o de instala？？es e equipamentos industriais
Barata,Eduardo Lopes;
Ciência & Tecnologia dos Materiais , 2007,
Abstract: the aim of this paper is to divulge the final results of the " projecto mobilizador sitem - sistema integrado de engenharia e gest？o da manuten？？o de instala？？es e equipamentos industriais", which was created to develop a set of methodologies and computing tools for supporting management systems and plant improvements. such methodologies were oriented to improve the performance of the maintenance managers, since it was well known that the portuguese maintenance departments had a very small participation from the phases of conception to the implementation of the industrial projects. the "projecto sitem" was developed by an industrial consortium formed by alstom portugal,s.a., celbi-celulose beira industrial,s.a., edp-gest？o de produ？？o de energia,s.a., feup-faculdade de engenharia da universidade do porto, isq- instituto de soldadura e qualidade and portucel-empresa produtora de pasta e papel, s.a.
O projeto de psicologia científica de Edward Tolman
Lopes, Carlos Eduardo;
Scientiae Studia , 2009, DOI: 10.1590/S1678-31662009000200005
Abstract: every project of scientific psychology faces at least two challenges. the first challenge appears when a proposal of psychology tries to follow the standard of modern science. in this case, it is necessary to make the psychological phenomena objective, what is done, most frequently, by means of its translation into physiological terms. in consequence, the specificity of psychology becomes threatened by physiological reductionism. the second challenge appears when a project of psychology tries to avoid the physiological reductionism by means of defending the irreducible and subjective nature of psychological phenomena. in fact, this kind of mentalism limits the application of scientific method. this essay intends to show how e. c. tolman's project of scientific psychology could be an alternative for those challenges. in first place, we show that tolman keeps himself away from the physiological reductionism in virtue of his molar conception of behavior. next, we analyze some difficulties of his proposal, especially the limitations of a realistic epistemology. finally, we present tolman's proposal for surmounting such difficulties: the analogy of scientific theories considered as maps, which reveals his mature instrumentalist epistemology.
O sonhar emancipatório e a educa o
Eduardo Simonini Lopes
Educa？？o : Revista do Centro de Educa？？o UFSM , 2010,
Abstract: O presente trabalho tem como principal objetivo problematizar o conceito de emancipa o, especialmente sua apropria o pelo campo educacional. O referido conceito foi muito incorporado a discursos revolucionários – principalmente a partir do movimento iluminista no Século XVIII – para indicar a busca por uma vida mais livre, mais esclarecida e também mais feliz, trazendo, nesta perspectiva, orienta es teleológicas que nutriram muitos sonhos político-ideológico-teológicos a promulgarem a possibilidade de se alcan ar – pelas mais diferentes formas de lutas – instancias de salva o coletiva e, ou bem-aventuran a individual. A educa o, quando significada como emancipatória, tendeu a fomentar propostas e práticas que muitas vezes se encontravam atreladas ao cultivo de ideais de progresso, desaliena o ou empreendedorismo. Porém, acredita-se haver outras significa es para o conceito de educa o emancipatória, principalmente quando se aborda a emancipa o n o pela perspectiva do progresso ou da evolu o, mas por uma orienta o que se apóia em políticas de inven o, promotoras de crises, rupturas e movimentos que possam fazer nascer maneiras de pensar-agir n o mapeadas e passíveis de cria o de novas sensibilidades. > Palavras-chave: Emancipa o. Educa o. Inven o.
A realidade do virtual
Eduardo Simonini Lopes
Psicologia em Revista , 2005,
Abstract: O presente trabalho prop e discutir o conceito de virtual, tendocomo apoio as obras de Pierre Lévy, Jean Baudrillard e Gilles Deleuze.Entendemos que diferentes propostas de realidade do virtualsurgem baseando-se na abordagem de cada um desses autores. E cadauma dessas propostas abre novas perspectivas para o pensamentode enxergar e manipular o conceito de virtual. Partimos, ent o,neste trabalho, do entendimento do virtual conquanto entidadedesterritorializada (Lévy, 1998), seguindo até sua compreens oenquanto espa o de potência (Deleuze, 1996). Cada uma dessasabordagens produz um modo de pensar, e, enquanto Lévy situa ovirtual como o espa o de representa o da consciência humana,Deleuze já o trabalha como dimens o de intensidades n o representacionais, promotora de contínua diferen a. Construímos, assim, uma reflex o sobre o modo como alguns pensadores têm trabalhadoo conceito de virtual: utilizando-o como recogni o e ignorandoseu entendimento como potência.
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