Periods of Weed Interference on Transgenic Cotton 'Imacd 6001ll'

Silva, Marcos Paulo da; Parreira, Mariana Casari; Bressanin, Fernanda Nunes; Alves, Pedro Luís da Costa Aguiar

doi:10.1590/1983-21252016v29n214rc

Cited by 2 publications

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“…On the other hand, the cultivar IPR Juriti with indeterminate growth type II, of more erect architecture, was consequently more sensitive to the interference of the weed community at the beginning of the vegetative period, resulting in an PPI of 5 DAE. Parreira et al [7] also obtained extremely low PPI values when analyzing beans with indeterminate growth type II of only 3 days, tolerating a 5% loss in productivity. With cultivars of habit indeterminate growth type III, cultivar Rubi, Scholten et al [18] and Bressanin et al [30] obtained results like the BRS Pontal cultivar, with PAI ranging from 19 to 23 DAE.…”

Section: Periods Of Interferencementioning

confidence: 97%

“…To correct weed management, it is necessary to cognize the periods of interference, so that management can be carried out at the appropriate time, thus allowing the culture to express its productive potential [5,6]. For Silva et al [7] in weed management, the period prior to interference (PPI) becomes one of the most important periods of the crop cycle, from which productivity is significantly affected. PPI is conceptualized as the period from emergence or planting,…”

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Bean plants with growth types and plant architecture that facilitate cultural practices and high productivity, have been an important requirement for farmers. However, overcoming competition with weeds becomes a limiting factor. This research was conducted to determine the period prior to interference (PPI) on bean cultivars of different types plant growth with an arbitrary level of 2.5%, 5% and 10% productivity loss. The experimental treatments consisted of eight coexistence periods of the crop and weeds: 0-10, 0-20, 0-30, 0-40, 0-50, 0-60, 0-70, 0-harvest days after emergence and a control plot that was kept weed-free throughout the study period. The experimental design was a random block design with four replications. The periods prior to interference were 21, 30 and 35 days for the BRS Pontal bean cultivar and 0, 5 and 12 days for the IPR Juriti cultivar, with the arbitrary levels of reduction of productivity of 2,5%, 5% and 10%, respectively, living with the infesting community composed predominantly of the species Digitaria sp., Portulaca oleraceae, and Eleusine indica. The architecture of the bean plant is of paramount importance in the choice of the farmer. However, 35 DAE of the bean plants, weed control must be done.

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Section: Periods Of Interferencementioning

confidence: 97%

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confidence: 99%