Agronomic evaluation of cowpea as a function of weed control with herbicides and different combinations

Abstract

Avaliação agronômica do feijão-caupi em função do controle de invasoras com diferentes herbicidas e combinações

Evaluation of yield performance in cowpea genotypes (Vigna unguiculata (L.) Walp.)

“…Silva and Neves (2011) found an HGW for the cultivars BRS Marataoã (15 g) and BRS Paraguaçu (16.7 g) similar to that considered as standard, and lower than the weight obtained in this study. However, these values are like those found by Pereira et al (2016), but lower than those seen by Souza et al (2016), who for the cultivar Setentão obtained a mean value for hundred-grain weight of 26.7g.…”

“…In Brazil, cultivation of the cowpea occurs in the North and Northeast Regions, and comprises one of the main socioeconomic alternatives, both in the supply of food and the generation of employment and income; no longer a mere subsistence crop, it has assumed a certain technological standard through the use of fertilisers and agricultural correctives, and through mechanisation, technifying the harvesting process, considered the main bottleneck in the production system (Freire Filho et al, 2005;Pereira et al, 2016;Souza et al, 2016).…”

Selectivity of pre-and post-emergent herbicides for cowpea (Vigna unguiculata)

“…Souza et al (2016) also observed that a mixture of the herbicides glyphosate + imazethapyr + flumioxazin caused phytotoxicity in the cowpea crop, placing limitations on the production components. Evaluating the herbicides Fomesafen and Lactofen, both protoporphyrinogen oxidase (Protox) inhibitors, Correa and Alves (2009), found symptoms of severe intoxication in the cowpea, with later recovery of the plants at 14 DAA, and moderate symptoms of intoxication at 30 DAA.…”

“…Symptoms of phytotoxicity in plants of the cowpea, as well as a great variability in the tolerance of the cowpea genotypes to different herbicides, are commonly seen after herbicide application (Silva et al, 2003;Ishaya et al, 2008;Souza et al, 2016). A number of factors could be related to this, such as soil type, precipitation, irrigation management, temperature and the cultivar used (Kunkel et al, 1996;Silva et al, 2003).…”

“…However, the use of these methods in the cowpea is limited due to the scarcity of studies into the selectivity of herbicides for the crop Souza et al, 2016). Most of the information on the use of herbicides is related to the common bean (Phaseolus vulgaris L.) or the soybean (Glicyne maxima (L.) Merr.)…”