CARACTERÍSTICAS DE CRESCIMENTO E PRODUÇÃO DO FEIJÃO-CAUPI (Vigna unguiculata (L.) Walp.) SOB APLICAÇÃO DE HERBICIDAS

Abstract

The area planted with cowpea (Vigna unguiculata (L.) Walp.) in Brazil, in particular in the Northeast, have enough social importance, promoting the attachment of the man in the field and being exploited increasingly for its high productivity even in water deficit, and along with this growth the demand for pre and post-emergence herbicides increased . In this context, the aim of this research was to evaluate the efficiency of the use of herbicides in weed control and its influence on growth characteristics and yield of bean crops. The experiment in unirrigated land was conducted under field conditions, in the Department of plant science center of agricultural Sciences (CCA), Campus II of the Federal University of ParaÍba (UFPB) located in the city Areia-PB. The experiment was arranged in a randomized block design, being the treatments constituted by pre and post-emergence herbicide concentrations: Afalon and Targa, alone and in combination (T1: No weeding, T2: Weeding, T3: Afalon (50% ) T4: Afalon (100%), T5: Targa (50%) T6: Targa (100%) T7: Targa (50%) + Afalon (50%), T8: Targa (100%) + Afalon (50%), T9:. Afalon (100%) + Targa (50%), applied to 15 days after seeding. The variables analyzed were plant height, stem diameter and number of leaves every 8 days, productivity, phytotoxicity and weeds control. Height and number of plant foliage were obtained with the herbicide treatments Targa 50%, and the mixture Targa (50%) and Afalon (50%). The treatment did not affect the stem diameter. Application with Afalon mixture (50%) and Targa (100%) showed the best results in productivity. Treatment with Afalon mixture (100%) and Targa (50%), proved to be the most efficient controlling 85% of the weeds. Treatment with Targa (50%) had the best result for phytotoxicity for the cowpea.