Abstract
ABSTRACT: Weeds from soils submitted to different tillage managements were identified in two consecutive years of soybean cultivation in the Cerrado of Roraima. The study was carried out in three areas: native area (NA), mechanically mowed native area (MA), and limed area (LA). A descriptive analysis of the phytosociological parameters relative density (Drr), relative frequency (Frr), relative dominance (Dor), importance value index (IVI), and index of relative importance (IRI) was performed to interpret the results. The weed similarity index (SI) was also calculated in the assessed areas. The highest relative frequencies were observed for Trachypogon plumosus (40.92%), Bulbostylis capillaris (18.52%), and Spermacoce capitata (18.33%) in the native area and T. plumosus (24.69%), Cyperus flavus (24.69%), and S. capitata (18.52%) in the mowed area. Among the species collected in the areas, the botanical families Poaceae, Cyperaceae, Fabaceae, and Rubiaceae are the most representative. The used managements contribute to the emergence of new species of spontaneous plants and weeds in the Cerrado of Roraima.
Highlights
Soybean is one of the main crops of the world agriculture because of its productive capacity, chemical composition, and nutritional value, which confers a plurality of uses in human and animal diet, with high socioeconomic importance
This study aimed to identify the weed infestation of soils submitted to different soil tillage management in two consecutive years of soybean cultivation in the Cerrado of Roraima
In studies carried out by Marques et al (2010), these families predominated in researches with cultivated species
Summary
Soybean is one of the main crops of the world agriculture because of its productive capacity, chemical composition, and nutritional value, which confers a plurality of uses in human and animal diet, with high socioeconomic importance. Brazil became the world’s second largest soybean producer when its cultivation areas were expanded to the Cerrado. In the 2015/16 season, soybean production was of approximately 95 million tons of grains in an estimated area of 35 million hectares (Conab, 2016). The Cerrado of Roraima covers approximately 4 million hectares and is part of the centralnortheast portion, forming part of the great Cerrado domain of northern Amazon, covering the extreme north of Brazil, Guyana, Venezuela, and Colombia. The State of Roraima is in the first steps of growth of the agricultural production in Brazil, moving towards the productive development of its main export product: soybean. In the 2014/15 season, the planted area was 16 thousand hectares, with an increase of approximately 40% in its planted area in the 2015/16 season, i.e., 25 thousand hectares of grains, representing a harvest above one million 60 kg bags
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