Growth and Development of Glyphosate-Resistant Amaranthus palmeri Identified in the State of Mato Grosso, Brazil
Journal Title: International Journal of Agriculture Innovations and Research - Year 2018, Vol 7, Issue 1
Abstract
Considering the importance of the weed Amaranthus palmeri (Palmer amaranth) to world agriculture, as well as its recent identification in Brazil, the objective of this work was to evaluate the growth and development of the Brazilian biotype of A. palmeri in non-competitive condition. Therefore, three similar experiments were carried out in a greenhouse to evaluate the phenology and accumulation of dry matter (shoot, roots and total) of this plant. Eight growth evaluations were carried out in each experiment, spaced 12 days apart, starting at 28 days after sowing (DAS), totaling a mean cycle of 105 days. Data of total dry matter was used to calculate the absolute and relative growth. Brazilian biotype of A. palmeri has a rapid phenological development, with onset of inflorescences at approximately 50 DAS. The phenological development of the species fitted to a linear model (y = 0.8866 x). Plants evaluated in greenhouse conditions showed maximum accumulated dry weight of 45 g plant-1, on average, with absolute growth peak at 60 DAS. Thus, the growth of this species were considered moderate compared with those from other Brazilian Amaranthus species and international data on A. palmeri
Authors and Affiliations
Ac á cio GON ÇALVES NETTO, et al.
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