oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Search Results: 1 - 10 of 2179 matches for " Constantin Jamil "
All listed articles are free for downloading (OA Articles)
Page 1 /2179
Display every page Item
Seletividade e eficiência agron?mica de herbicidas no controle de capim-colch?o na cultura da melancia
Maciel, Cleber D.G.;Constantin, Jamil;Goto, Rumy;
Horticultura Brasileira , 2002, DOI: 10.1590/S0102-05362002000300015
Abstract: the selectivity and agronomic efficiency of clethodim and sethoxydim herbicides on d. horizontalis control in watermelon crop was evaluated. the experiment was carried out at floresta, paraná state, brazil, in 1995/96. the watermelon cultivar used was crimson sweet and the experimental design was a randomized block with four replicates. the treatments evaluated were clethodim (240 g/l) in the dosage of 84; 96, 108 g i.a./ha with 1.0 l/ha of mineral oil (dytrol); sethoxydim (184 g/l) in the dosage of 230 g i.a./ha with 1.0 l/ha of mineral oil (assist); free of weeds and weedy. the herbicides were applied in post-emergency, when the watermelon had branches up to 1.4 m long and the d. horizontalis presented three leaves and three tillers, and density of 240 plants/m2. the injury evaluations (e.w.r.c.), control (0-100%) and weed control. were performed at 7. 15 and 30 days after application of treatments. the clethodim herbicide, in the dosage of 96 g i.a./ha or higher, controlled efficiently the d. horizontalis (100), being more efficient than sethoxydim in controlling weeds. none of chemical treatments affected the watermelon development and production. weedy plots with d. horizontalis interfered in the culture development, resulting in a 36% reduction on watermelon production.
Seletividade e eficiência agron mica de herbicidas no controle de capim-colch o na cultura da melancia
Maciel Cleber D.G.,Constantin Jamil,Goto Rumy
Horticultura Brasileira , 2002,
Abstract: Foi avaliada a seletividade e a eficiência agron mica dos herbicidas clethodim e sethoxydim, no controle de Digitaria horizontalis (capim-colch o) na cultura da melancia (cv. Crimson Sweet). O experimento foi conduzido em campo, no município de Floresta, PR, em 1995/96, em delineamento de blocos ao acaso, com quatro repeti es. Os tratamentos avaliados foram clethodim nas doses de 84; 96 e 108 g i.a./ha adicionado de 1,0 L/ha de óleo mineral (Dytrol), sethoxydim na dose de 230 g i.a./ha adicionado de 1,0 L/ha de óleo mineral (Assist) e testemunhas com e sem capina. Os herbicidas foram aplicados em pós-emergência, quando a melancia apresentava ramas com 1,4 m e a D. horizontalis em estádio de três folhas a três perfilhos e densidade de 240 plantas/m2. Para a aplica o dos herbicidas utilizou-se pulverizador costal de press o mantida por inje o de CO2, equipado com pontas de jato plano XR110.02 e volume de calda de 200 L/ha. As avalia es de seletividade (Escala E.W.R.C.) e controle das plantas daninhas (0 - 100%) foram efetuadas aos 7; 15 e 30 dias após aplica o dos tratamentos. Os resultados indicaram que o herbicida clethodim, a partir de 96 g i.a./ha, controlou eficientemente a D. horizontalis, sendo estatisticamente superior ao herbicida sethoxydim e à testemunha sem capina. Nenhum dos tratamentos químicos causou fitotoxicidade que afetasse o desenvolvimento e a produ o da melancia. A D. horizontalis interferiu no desenvolvimento da cultura, causando redu o média de 36,0% da produ o da melancia.
Característica da deposi??o e distribui??o da calda de pulveriza??o na cultura da soja em estádio fenológico V6
Constantin, Jamil;Sales, José G. C.;Maciel, Cleber D. de G.;
Engenharia Agrícola , 2012, DOI: 10.1590/S0100-69162012000300012
Abstract: this work aimed to evaluate the performance of spray deposition produced by different spray nozzles and work pressures in soybean crop on v6 phenological stage. eight treatments and fifty repetitions were studied in completely randomized delineation, in factorial scheme 4x2, represented by four models of spray nozzles of magnotm manufacturer and by two work pressures (207 and 414 kpa), constituting the treatments ad 11002 (152 l ha-1 and 208 l ha-1), ad/d 11002 (152 l ha-1 and 208 l ha-1), ad-ia/d 11002 (152 l ha-1 and 208 l ha-1), mag 2 and mag 3 (157 l ha-1 and 212 l ha-1). bright blue fd&c-1 (0.3% p/v) and tartrazine yellow fd&c-5 (0.6% p/v) were used as tracers to monitoring the spray deposition. the unitary deposits of solutions over the upper and lower trifoliates from the soybean plants were quantified by spectrophotometer. the greatest amounts of spray deposition, at upper and lower positions of soybean crop, were obtained with mag 2 and ad/d 11002 nozzles, with 414 kpa pressure. the pressure increase from 207 to 414 kpa using ad11002, ad/d 11002 and ad-ia/d 11002 nozzles raised the deposition over upper and lower trifoliates, in opposition to the use of mag 3 nozzle in relation to mag 2, in 414 kpa.
Efeito de sistemas de manejo sobre a velocidade de desseca o, infesta o inicial de plantas daninhas e desenvolvimento e produtividade da soja = Effect of burndown management on desiccation speed, initial weed emergence, development and yield of soybean
Carla Cristina Jaremtchuk,Jamil Constantin,Rubem Silvério de Oliveira Júnior,Denis Fernando Biffe
Acta Scientiarum : Agronomy , 2008,
Abstract: No sistema de semeadura direta, a desseca o que antecede à semeadura (manejo) é uma das opera es mais importantes para maximizar o crescimento inicial das culturas e minimizar a interferência das plantas daninhas no início do ciclo. O objetivo do trabalho foi avaliar o efeito de diferentes sistemas de manejo que antecede à semeadura da soja, no município de Iguara u, Paraná, no ano agrícola de 2004/2005. Foram comparados cinco épocas de manejo (10, 7, 5, 3 e o dias, antes da semeadura), com três tratamentos herbicidas (glyphosate 1080 g, glyphosate + flumioxazin 1080 + 25 g ha-1 e glyphosate + flumioxazin 1080 + 40 g ha-1), em rela o à velocidade de desseca o, infesta o inicial de plantas daninhas e desenvolvimento e produtividade da soja. A associa o de glyphosate com flumioxazin em compara o com a utiliza o de glyphosate, isoladamente, apresentou como benefícios maior velocidade de desseca o da biomassa presente e efeito residual no controle do primeiro fluxo de infesta o da cultura. A acelera o da morte da cobertura vegetal possibilita a semeadura em espa o de tempo menor após a desseca o. In no-tillage systems, burndown is one of the most important steps to achieve maximum initial crop growth and minimize weed interference during early stages of the crop cycle. The purpose of this work was to evaluate the effect of different burndown systems before no-tillage sowing of soybean. A field experiment was carried out in Iguara u, Paraná State, during the 2004/2005 growth season. Under field conditions, five burndown dates (10, 7, 5, 3 and 0 days before sowing) combined with three herbicide treatments (glyphosate 1080 g, glyphosate + flumioxazin 1080 + 25 g ha-1 and glyphosate + flumioxazin 1080 + 40 g ha-1) were compared in regards to desiccation speed, initial weed emergence, development and yield of soybean. Compared to the use of glyphosate alone, this association showed positive aspects such as faster desiccation speed and a soil residual effect over the first cycle of weed emergence after crop sowing. With a faster decrease in soil cover, it is possible to begin soybean sowing shortly after desiccation.
Aplica es seqüenciais de flumicloracpentil para o controle de Euphorbia heterophylla na cultura da soja = Sequential application of flumicloracpentil for Euphorbia heterophylla control in soybeans
Rubem Silvério de Oliveira Jr,Jamil Constantin,Roberto Toledo,Luciano Hiroyuki Kajihara
Acta Scientiarum : Agronomy , 2006,
Abstract: Euphorbia heterophylla destacase como a principal planta daninha na cultura da soja no Estado do Paraná, n o só pela sua dissemina o, mas também pela natural dificuldade de controle e pela ocorrência de biótipos que apresentam resistência. Em face de tais problemas, buscou se avaliar a eficácia de aplica es seqüenciais em pós emergência de flumicloracpentil no controle dessa planta daninha. As aplica es seqüenciais de flumicloracpentil foram superiores, em termos de eficácia, às doses recomendadas em aplica o única, promovendo no mínimo 86% de controle aos 24 dias após a aplica o dasegunda etapa das seqüenciais. Todas as combina es de doses de flumicloracpentil avaliadas promoveram controle adequado de E. heterophylla, desde que aplicadas no estádio de duas folhas verdadeiras. Comparando se os resultados obtidos em casadevegeta oe em estufa, observou se que, em condi es de campo, o sombreamento imposto pela soja auxilia no nível de controle final da planta daninha. Wild poinsettia (Euphorbia heterophylla) is one the most importantweeds in soybean fields in the state of Paraná, not only for its dissemination, but also due to its natural difficulty of controlling features by herbicides and to occurrence of resistant biotypes. Facing those problems, an evaluation of the field and greenhouse trials was carried out in order to check the efficacy of postemergencesequential application of flumicloracpentil to control this weed. Sequential applications of flumicloracpentil were more efficientthan a single application, promoting, at least, 86% of weed control on the 24th day after the second application of the sequential treatments. All the evaluated combinations of flumiclorac rates once sprayed at two true leaves stage, promoted adequate control of E. heterophylla. Comparing the greenhouse and the field results, it was concluded that, under field conditions, the canopy provided by the crop helps to improve the weed final control.
Lixivia o e degrada o de diuron em dois solos de textura contrastante = Leaching potential and degradation of diuron in two soils of contrasting texture
Miriam Hiroko Inoue,Rubem Silvério de Oliveira Jr.,Jamil Constantin,Diego Gon?alves Alonso
Acta Scientiarum : Agronomy , 2008,
Abstract: Objetivou-se estudar a lixivia o do diuron em colunas de solo, além do efeito de métodos de redu o da atividade microbiana na degrada o deste herbicida em amostras de LATOSSOLO VERMELHO Distrófico (LVd – textura franco-arenosa) e LATOSSOLO VERMELHO Distroférrico (LRd – textura argilosa). Para avaliar a movimenta o do diuron(0; 1,6 e 3,2 kg ha-1), foram aplicadas laminas de 0, 20, 40, 60 e 80 mm de água. Na degrada o, os métodos de restri o empregados foram: autoclavagem prévia, aplica o de brometo de metila, amoxicilina, captan e amoxicilina+captan, sendo que as amostras foram mantidas na ausência ou presen a de luz. Resultados indicam que laminas superiores a 60 mm foram suficientes para promover movimenta o nítida nas amostras de LVd. Para o LRd, independente da lamina aplicada, a movimenta o do herbicida ficou restrita à camadasuperficial. Nos ensaios de degrada o, para o LRd, verificou-se que o acúmulo de biomassa do bioindicador Brachiaria decumbens foi maior nas amostras de solo que n o receberam nenhum método de restri o. Amostras de LVd que receberam qualquer um dos métodos de restri o e foram mantidas na luz proporcionaram menor produ o de biomassa, emcompara o aos demais tratamentos. Evidenciou-se, ainda, que, independente do solo, o acúmulo de biomassa de B. decumbens foi maior nas amostras que permaneceram na luz. This research was aimed at studying the leaching of diuron in soilcolumns, as well as the effect of different methods of reduction of microbial activity on diuron degradation in samples of a sandy loam soil (LVd) and a clay soil (LRd). To measure the downward movement of diuron (0; 1.6 and 3.2 kg ha-1), water layers of 0, 20 40, 60 and80 mm were applied. For degradation studies, the methods used to restrict were as follow: sterilized in autoclave, methyl bromide application, amoxicillin, captan and amoxicilin+captan; soil samples were kept with or without light incidence. Water depths > 60 mm were enough to promote observable leaching in LVd samples. For clay soil,regardless of the water layer applied, herbicide movement was limited to the superficial soil layer. In degradation studies, biomass accumulation of bioindicator Brachiaria decumbens was higher in LRd samples with no restriction. LVd soil samples treated with any microbial activity restriction methods and exposed to light led to bioindicator biomass reduction, in comparison to others treatments. For both soils, biomass of B. decumbens was increased in soil samples that remained exposed to light.
Contrasts among origins of corn hybrids in relation to their susceptibility to nicosulfuron and isoxaflutole herbicides
Sidnei Douglas Cavalieri,Rubem Silvério de Oliveira Junior,Jamil Constantin,Denis Fernando Biffe
Semina : Ciências Agrárias , 2010,
Abstract: Herbicide selectivity is the basis for successfull weed chemical control in agricultural production, as it is considered as a measurement of the difeerential response of different plant species to a certain herbicide. The objective of this work was to evaluate the effect of the origin of corn hybrid in relation to its susceptibility to the herbicides nicosulfuron and isoxaflutole. The research was conducted in greenhouse conditions and comprised two experiments, being the first one with nicosulfuron (09/09/2005 to 10/24/2005) and another one with isoxaflutole (10/09/04 to 11/10/04). Both experiments were run in a randomized blocks design, in a factorial scheme 33x3 for nicosulfuron and 23x3 for isoxaflutole, with four replicates. The first factor was constituted by corn hybrids and the second one by herbicide rates. After herbicide spraying, shoot dry biomass was evaluated. It was concluded that origins of corn hybrids affects the susceptibility to the herbicides nicosulfuron and isoxaflutole. In average, Balu and Codetec hybrids were the most sensitive to nicosulfuron. For isoxaflutole applied at 120 g ha-1 Balu hybrids were more tolerant than Embrapa hybrids. A seletividade de herbicidas é a base para o sucesso do controle químico de plantas daninhas na produ o agrícola, sendo considerada uma medida da resposta diferencial de diversas espécies de plantas a um determinado herbicida. Objetivou-se neste trabalho avaliar o efeito da procedência de híbridos de milho em rela o à suscetibilidade aos herbicidas nicosulfuron e isoxaflutole. O estudo envolveu dois experimentos, um com nicosulfuron no período de 09/09/05 a 24/10/05 e outro com isoxaflutole no período de 09/10/04 a 10/11/04, ambos realizados em casa-de-vegeta o. Os experimentos foram conduzidos no delineamento de blocos ao acaso, em arranjo fatorial de 33x3 para o nicosulfuron e 23x3 para o isoxaflutole, com quatro repeti es, sendo que o primeiro fator constituído por híbridos de milho e o segundo por dosagens dos herbicidas. Após a aplica o do herbicida, avaliou-se a massa seca de parte aérea das plantas. Existem diferen as de tolerancia entre procedências de híbridos de milho em rela o à suscetibilidade aos herbicidas nicosulfuron e isoxaflutole. Constatou-se que, em média, as procedências Balu e Coodetec foram mais sensíveis ao nicosulfuron do que as demais procedências. Na dosagem de 120 g ha-1 de isoxaflutole, em média, a procedência Balu mostrou-se mais tolerante que a Embrapa.
Glyphosate associated with other herbicides for control of Commelina benghalensis and Spermacoce latifolia Glyphosate associado a outros herbicidas no controle de Commelina benghalensis and Spermacoce latifolia
Antonio Claudemir Ramires,Jamil Constantin,Rubem Silvério de Oliveira Júnior,Naiara Guerra
Semina : Ciências Agrárias , 2011,
Abstract: The widespread cultivation of Roundup Ready soybeans enabled the use of glyphosate for post-emergence weed control in, turning weed handling into an easier and less costly operation. Despite such improvements, controlling glyphosate tolerant species can still be improved by associations with other herbicides. The aimed at evaluating the effect of the association of different herbicides with glyphosate in relation to Commelina benghalensis and Spermacoce latifolia control, after spraying plants in two different growth stages (1-3 and 4-6 leaves). For that, four experiments were carried out under greenhouse conditions, where glyphosate was applies at rates of 480 and 960 g a.e. ha-1, isolated or combined in tank mixtures with cloransulam-methyl (30,24 g ha-1), chlorimuron-ethyl (12,5 g ha-1), imazethapyr (80 g ha-1), fomesafen (62,5 g ha-1), lactofen (72 g ha-1), flumiclorac-pentyl (30 g ha-1) and bentazon (480 g ha-1), besides a no-herbicide check. We evaluated the percentage of control at 3, 7, 14, 21, 28 and 35 days after application (DAA) and shoot dry mass (35 DAA). For C. benghalensis control, when herbicides were applied at 1-3 leaves stage, all treatments performed satisfactorily in weed control. For S. latifolia, the highest levels of weed control when applications were made at 4-6 leaves stage, when even glyphosate alone at lowest rate (480 g a.e. ha-1), provided excellent weed control. Overall, the use of tank mixtures improved weed control of both species when the rate of 480 g a.e. ha-1 of glyphosate was applied at earlier stages of weed development. A libera o da soja transgênica possibilitou o uso do glyphosate para o controle das plantas daninhas em pós-emergência, facilitando o manejo e diminuindo os custos. No entanto, o controle de algumas espécies tolerantes ao glyphosate pode ser otimizado com associa es com outros herbicidas. O trabalho teve como objetivo verificar o efeito da associa o de diferentes herbicidas com glyphosate para o controle de Commelina benghalensis e Spermacoce latifolia após aplica o dos herbicidas em dois estádios de desenvolvimento (1-3 e 4-6 folhas). Para isso, foram realizados quatro experimentos em casa de vegeta o, aplicando-se glyphosate nas doses de 480 e 960 g ha-1, isolado ou combinado com os latifolicidas cloransulam-methyl (30,24 g ha-1), chlorimuron-ethyl (12,5 g ha-1), imazethapyr (80 g ha-1), fomesafen (62,5 g ha-1), lactofen (72 g ha-1), flumiclorac-pentyl (30 g ha-1) e bentazon (480 g ha-1), além de uma testemunha sem herbicida. Foram realizadas avalia es de porcentagem de controle aos 3, 7,
Seletividade de combina es de herbicidas latifolicidas com lactofen para a cultura de soja
Souza Reginaldo Teodoro de,Constantin Jamil,Velini Edivaldo Domingues,Montorio Gilmar Aparecido
Scientia Agricola , 2002,
Abstract: Combina es de herbicidas visam o aumento do espectro de controle de plantas daninhas do complexo florístico, sendo usadas na agricultura com freqüência. Este trabalho teve como objetivo estudar a seletividade das combina es do herbicida lactofen, com bentazon, fomesafen, chlorimuron-ethyl e imazethapyr na cultura da soja, cultivar BR-37. Para isso, foi instalado um experimento de campo em Maringá-PR, em área livre de plantas daninhas evitando assim possíveis interferências sobre a cultura. Os tratamentos combinados foram obtidos aplicando-se de maneira contínua cada produto e suas doses a 75, 50 e 25% da dose comercial, seguindo as linhas de soja e novamente, aplicando-os perpendicularmente as mesmas, sendo assim, os locais onde houve o cruzamento e sobreposi o das aplica es, formaram-se as combina es dos herbicidas, originando também, quatro testemunhas diagonais aos tratamentos. A compara o entre as médias de produtividade foi feita com o cálculo dos intervalos de confian a das testemunhas e de cada tratamento, adotando-se o teste t a 5%. As combina es foram seletivas para a cultura da soja. Verificaram-se redu es na produtividade de soja entre as combina es com os herbicidas nas maiores doses, sugerindo a necessidade de realizar novas pesquisas com os mesmos.
Passive Knowledge: How to Make Sense of Kant’s A Priori——Or How Not to Be “Too Busily Subsuming”  [PDF]
Constantin Antonopoulos
Open Journal of Philosophy (OJPP) , 2011, DOI: 10.4236/ojpp.2011.12008
Abstract: Subjectivists, taking the “collapse” of the observation-interpretation contrast much too seriously, are led to imagine that even perceptual knowledge is active. And therefore subject dependent. Turning the tables on this popular trend, I argue that even conceptual knowledge is passive. Kant’s epistemology is conceptual. But if also active, then incoherent. If synthetic a priori truths are to follow upon our mental activity, they were neither true nor, far less, a priori before that activity. “A priori” and “active” are contradictory attributes of knowledge. As, indeed, are “a priori” and “subject-dependent” to begin with. Nothing a priori can be dependent on anything except itself, and least of all on the human subject. Kant does consider the active aspect of thought. The difference is that for him the more active it becomes, the less it is to be trusted. For we are no longer in the province of the Understanding, and its necessary truths, but in the realm of Pure Reason and its dialectical antinomies. Cognition activists who take a liking to Kant have simply mistaken Reason for the Understanding. And Reason is to Kant “the seat of all transcendental illusion”.
Page 1 /2179
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.