1000 resultados para velocidade de semeadura
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Agronomia - FEIS
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Pós-graduação em Agronomia - FEIS
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Pós-graduação em Agronomia - FEIS
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Agronomia (Agricultura) - FCA
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Agronomia (Agricultura) - FCA
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Pós-graduação em Agronomia (Agricultura) - FCA
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Luís Guilherme Coelho Buchianeri propõe, nesta obra, que nos dias atuais a velocidade continua acelerando exponencial e paradoxalmente, mas apenas no mundo externo. No mundo interno, se desacelera, “tendendo a uma paralisia que não promove a angústia estruturante, mas leva à agonia, à sensação de falta de futuro, à necessidade de preenchimento do tempo com conteúdos dados à imediaticidade dos afetos”. Tal busca de concretude, diz, impede a subjetivação do ser humano moderno. A subjetividade, segundo o autor, considerada lenta e imprecisa, está sendo descartada na era da instantaneidade e da satisfação imediata dos desejos, em que a máquina possibilita que tudo se realize em “tempo real”. Assim, se no nascimento da modernidade a velocidade instigava a ação, transformação e rebeldia, hoje, vazia de conteúdos, paralisa e instala nesse espaço um tempo entediante. Nos jovens, principalmente, essa variedade de estímulos decorrentes dessas mutações no espaço e no tempo produziria uma falta de sentido na vida, acompanhada por “um esvaziamento do sujeito, uma sensação subjetiva a que poderíamos denominar tédio”. Paralelamente a esse tema, discutido amplamente neste livro, que leva em conta a realidade de jovens de diversos países, o autor aborda outra questão contemporânea – a da “depressão como figura de subjetivação da atualidade”. Ao analisar conceitos com base em teorias da Psicologia e da Filosofia, ele procura demonstrar que o tédio se sobressai em relação à depressão como a subjetividade típica de um mundo acelerado e volátil
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OBJECTIVE: To verify the use of maximal running distance performed on Hoff test to predict the anaerobic threshold speed (sAnT). METHODS: Ten young soccer players (age of 17 ± 1 years and body mass of 64.3 ± 2.1 kg) were subjects of the study. The subjects performed 12-min test, lactate minimum test to estimate the anaerobic threshold speed and a field test called Hoff. The purpose of Hoff test was to cover the maximum distance during a period of 10min moving a soccer ball through the track by dribbling. RESULTS: The distance covered during 12-min was 2673.2 ± 64.7 m, the sAnT was 11.6 ± 0.3 km.h-1 and distance covered during test Hoff test was 1458.7 ± 49.6 m. The distance covered during Hoff test was not significantly correlated with sAnT (r = -0.20; P > 0.05) and distance covered during 12-min test (r = -0.15; P > 0.05). The sAnT did not differ of speed correspondent 90% at 12-min speed and they were statistically correlated (r = 0.65). CONCLUSION: Thus, we concluded that maximal distance covered during Hoff test cannot provides a valid prediction of the anaerobic threshold speed.
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The fall armyworm Spodoptera frugiperda is one of the most important pests of maize. Various studies are conducted for their management, integrating chemical and biological control tactics as well as resistant plants. In order to offer alternatives for an efficient management of this pest with minimal use of pesticides, the technology of genetically modified plants resistant to insects has been widely studied. The aim of the present study was to evaluate the natural infestation of larvae of S. frugiperda and their injuries under field conditions in transgenic maize hybrids compared to their conventional isogenic counterparts at two sowing dates and two regions. The hybrids were planted in the off season of 2010 in Jaboticabal, SP, Brazil, and the summer of 2010/2011 in Jaboticabal, and Pindorama, SP, in a randomized block with seven treatments (hybrids) and four replications. Different levels of infestation of larvae occurred throughout the phenological development of plants in conventional and genetically modified hybrids with significant differences between the two groups in most evaluations. The hybrid 2B710HX was the least infested with caterpillars and had the least damaged leaf area. It follows that the Cry1F toxin was the most effective in protecting the plant in relation to other toxic proteins expressed by the other Bt hybrids against infestation and damage promoted by this pest, regardless of time of sowing.
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The cutting of plant residue in no-tillage systems under certain environmental conditions becomes necessary to adequately establish and grow crops. This study aims to assess the effect on the yield of different methods of managing millet plant residue in cotton plantations. The study was conducted during the agricultural years 2006/07 and 2007/08, and the treatments included no-mechanical-treatment tillage and the use of a rotary shredder, crimper-roller, and mechanical disintegrator for millet plants before sowing the cotton. Evaluations were performed for the residue fragmentation, emergence speed, percent of soil cover during the cycle and yield of the cotton crop. The emergence speed was faster in the management with the rotary shredder. In 2006/07, the no-tillage treatment showed a rate of loss for soil cover that was 46 percent greater than the disintegrator treatment. The rotary shredder and the disintegrator yielded greater soil coverage during the cultivation cycle, and the yield was highly correlated with the soil cover at 75 days after emergence. The management of the millet residue affected the cotton plants for the two-year study period.