Interferência de plantas daninhas na cultura do milho cultivado em segunda safra com dois espaçamentos

Abstract

The objective of this study was to evaluate the interference of weeds in corn crop, cultivated on two spacings, under no-tillage system, in order to determine the periods of infesting community interference. The trial was conducted at Federal University of Goiás, Regional Jataí. The experimental design was randomized blocks in a split-split plot design with three replications. The row spacings of plots were (0.45 and 0.90 m). The subplots were coexistence groups (with and without bush) and the split-split plots were seven periods of coexistence or control of the weed community (0, 10, 20, 30, 40, 60 and 120 DAE). Weed control was performed by manual weeding. The weed community was evaluated by density and floristic composition. Plant height, cob insertion height, cob diameter, cob length, number of rows per cob, number of grains per row and grain yield were evaluated. In corn plants, it was verified that there coexistence with weeds was significant difference for cob insertion height, cob length and number of rows per cob. The 0.90 m row spacing provided a longer cob length. Interference periods (PAI, PCPI, PTPI) were not possibel determined for Feroz Vip at short season under two spacings