Growth and yield of maize in purple nutsedge interference

Abstract

This research aimed evaluates the influence of purple nutsedge (Cyperus rotundus) on the agronomic performance of maize. We conducted a field experiment at Viçosa, MG, in completely randomized design experimental with three replications. The treatments consisted of the interaction of maize with nine nutsedge densities (0, 10, 30, 50, 90, 110, 130, 160 and 260 plants m-2). In the flowering culture was made the measurement of plant height, the insertion of the corn ears and the total dry matter of corn plants. At harvest were determined ear weight, grain yield and 100-grain weight adjusted to 13% moisture. Higher density of nutsedge increased plant height and the insertion of the first corn ear. We also observed a reduction in total dry matter accumulation, ear weight, 100-grain weight and grain yield in all densities evaluate. Nutsedge control, even at low densities is necessary because the presence of this plant promotes negative effect on growth and development of corn with a direct consequences on crop productivity.