CUNTINS - Campus Universitário do Tocantins/Cametá

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/4076

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Agora exibindo 1 - 2 de 2

Acesso aberto (Open Access)
Comparação entre métodos para determinar o período anterior à interferência de plantas daninhas em feijoeiros com distintos tipos de hábitos de crescimento
(2014-12) PARREIRA, Mariana Casari; ALVES, Pedro Luis da Costa Aguiar; LEMOS, Leandro Borges; PORTUGAL, João Martim de
Beans grain productivity may be reduced by up to 80% and, therefore, knowing the proper time to control weeds becomes fundamental, his research was conducted in order to determine the period prior to interference (PPI) on bean cultivars of different types' plant growth through distinct approaches: arbitrary level of 5% productivity loss; tolerance level (TL), and the Weed Period Prior to Economic Loss (WEEPPEL). Experimental treatments were constituted of ten periods of coexistence, periods of the crop with the weeds: 0-7; 0-14; 0-21; 0-28; 0-35; 0-42; 0-49;0-56; 0-97 (harvesting) days after emergency (DAE), and a control plot, weed free for the entire period. The experimental design was of the Random Block Design, with four replications. PPI was obtained in all of the different approaches, and the bean plant type II with indeterminate growth had the lowest times of coexistence.
Acesso aberto (Open Access)
Periods of weed interference on transgenic cotton IMACD 6001LL
(Universidade Federal do Pará, 2016-06) PARREIRA, Mariana Casari; BRESSANIN, Fernanda Nunes; ALVES, Pedro Luis da Costa Aguiar; SILVA, Marcos Paulo da
The objective of this study was to determine the periods of weed interference and its impact on productivity of cotton 'IMACD 6001LL'. The experiment was conducted in Jaboticabal, São Paulo, the second crop in 2011 and consisted of two treatment groups: the first culture remained free of competing weeds since of emergence up different periods of its development: (0-15 , 0-25, 0-35, 0-45, 0-55, 0-65, 0-75 and 0-183 days - harvest). In the second treatment group was held to the contrary: the crop was in harmony with the weeds since of emergence up to the same stages of development described above. The treatments were arranged in a randomized block design in four replications. During these periods was evaluated dry matter accumulation by weeds. The cotton yield data were subjected to regression analysis and resulting in a CPWC of 35 DAE, the CPWR was 133 DAE and .The weed community was composed mainly of Raphanus raphanistrum, Amaranthus spp., Cyperus rotundus, Alternanthera tenella and Eleusine indica. Living with this community throughout the cycle resulted in reduction almost 85% in cotton yield.

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Navegando CUNTINS - Campus Universitário do Tocantins/Cametá por Autor "ALVES, Pedro Luis da Costa Aguiar"