Abstract

AMORIM DA SILVA, Denysson et al. Characterization of weed in rotated area of maize and cowpea in direct planting. Scientia Agropecuaria [online]. 2018, vol.9, n.1, pp.7-15. ISSN 2077-9917.  http://dx.doi.org/10.17268/sci.agropecu.2018.01.01.

The aim of this work was to characterize weeds in a rotational area of maize and cowpea under notillage system. The samples were collected four months after the corn harvest. For sampling, 0.50 • 0.50 m cast iron square, randomly cast twenty-five times in the experimental area with 1508 m2 was used. The weeds were identified and quantified by means of the sum of the samples obtained by the launch of the square. The evaluated variables included: frequency, density, abundance, relative frequency, relative density, relative abundance and importance value index of the species. The botanical classes, families, species, type of propagation, life cycle and habit of growth were described. In the experimental area, 38 species were identified, distributed in 7 families, most of them (68.4%) the botanical class of dicotyledons. The families Fabaceae (28.9%) and Poaceae (26.3%) predominated. The species that presented the highest value of importance were: Digitaria horizontalis with 44.66% preceded by Cyperus flavus with 34.13%, Digitaria insulares with 22.87%, Cyperus sp. with 16.18% and Brachiaria plantaginea with IVR of 14.75%, which are of the same order of magnitude and should also be considered in the management strategy

Keywords : phytosociology; infestation of weeds; Zea mays; Vigna unguiculata; planting in the straw.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )