Weed Phytosociology in Cassava Cultivation in Two Periods in Southwestern Bahia, Brazil

Abstract

Knowing the most important species in the weed community is necessary to decide the best weed control method to be used. Thus, a phytosociological survey was carried out on cassava cultivation areas located in five rural properties of Cândido Sales, BA, Brazil, one of the state’s largest cassava producers. Two collections were carried out in each property in February (summer) and August (winter) 2016. A square metal frame with 0.25 m2 was randomly placed in each area, zigzagging, and establishing a proportion of 25 castings per hectare, with a sampling area of 6.25 m2 in each area. Weeds were identified and quantified, and then phytosociological parameters of frequency, density, abundance, relative frequency, relative density, relative abundance, and importance value index were determined. The analysis of the similarity between populations of the areas and periods was determined by the Sorensen similarity index. A variation of weed community composition was observed between cassava and harvest periods, with a higher infestation in the summer. A similarity was observed between cassava cultivation areas.

Phytosociological study of weeds associated with carrot crops in two municipalities of Boyacá

“…To characterize the associated weed species, samples were taken in each lot selected by municipality, a W-shaped layout was made covering an area of 500 m 2 following the methodology described by Cardenal et al [4] . A pvc frame of 0.25 cm × 0.25 cm was used according to Prates et al [19] , in order to take 9 samples per lot with a profundity of 30 cm, once the samples were homogenized they were arranged in 9 aluminum trays of 31 cm long by 25 cm wide and 5 cm deep. They were kept under adequate conditions of water, light and humidity.…”

Fitossociologia de plantas espontâneas em cultivo orgânico de cenoura

“…A identificação da comunidade infestante, seus hábitos de crescimento e propagação, além da habilidade competitiva, é essencial para determinar as melhores práticas de manejo a serem adotadas, com perspectiva na supressão e controle de plantas espontâneas em diversas culturas (MARQUES et al, 2017;PRATES et al, 2019), tanto no sistema convencional como orgânico.…”

Levantamento fitossociológico de plantas daninhas na cultura do feijao-caupi em sistemas de plantio direto e convencional

“…Para isso, pesquisas fitossociológicas que fornecerão uma visão geral da composição e distribuição das espécies de plantas daninhas são essenciais e devem ser realizadas. Esse conhecimento permite a formação de programas mais eficazes de manejo de plantas daninhas em áreas cultivadas (Prates et al, 2019) Considerando que o Estado do Piauí é uma das últimas fronteiras agrícolas do Brasil (Silva et al, 2021), e que o feijão-caupi vem ganhando notoriedade como alternativa viável para primeira e segunda safra, além de cultivos de sucessão no Cerrado piauiense, estudos voltados para se obter diagnóstico adequado sobre a situação da infestação de plantas daninhas para a cultura do feijão-caupi é essencial nesta região.…”