ESPAÇAMENTO ENTRE FILEIRAS E POPULAÇÃO DE PLANTAS EM MILHO

Abstract

With the objective of evaluating the effects of row spacing and plant population on grain yield and agronomic characteristics of corn, two trials were carried out in the region of Campos Gerais, state of Paraná. The experimental design was complete randomized blocks arranged in split plot, with main plot composed of tree rows spacing (40, 60 and 80 cm) and subplot composed for combination of tree plant populations (60.000, 80.000 and 100.000 plants ha-1) and tree hybrids, P 30F53, P 30R50 and AG 9020 in Arapoti and P 30F53, P 30R50 and DOW 2A120 in Castro. The results of this study showed: (i) the answers for spacing reduction and increase of plant population don’t depends of hybrid, (ii) in Arapoti grain yield increased with row reduction from 80 to 40 cm, independent of plant population, (iii) in Castro the increase of grain yield with row reduction from 80 to 40 cm occurred only at population of 100.000 plants ha-1, (iv) the reduction of row width didn’t influenced the days for silking, days for harvest, plants height, grains mass, percentage of rot stalks, stalk lodging, plant lodging and injured grains, (v) the increase of plant population caused reduction of stalk diameter and, depending of the hybrid, increased rot stalks, stalk lodging and injured grains