EFEITO DO NITROGÊNIO NA INTENSIDADE DA FERRUGEM COMUM E DAS PODRIDÕES DO COLMO DE HÍBRIDOS DE MILHO
THE EFFECT OF NITROGEN ON COMMON RUST AND STALK ROTS OF MAIZE HYBRIDS
Abstract
This study was conducted at the Santa Terezinha do Salto district (Lages, SC, Brazil) during the 1998/1999 growing season. The main objective of this trial was to evaluate the effects of increasing rates of nitrogen (0, 50, 100 and 200 kg/ha) fertilization (Urea form) in combination with com (Zea mays) hybrids (AG 12, AG 28, AG 303, and AG 9012) on the incidence and severity of common rust (Puccinia sorghi) and stalk rots (Gibberella zea and Pythium sp.). The experimental design was a completely randomized block (four replications) with split-plots. Hybrids were located on the main plots and nitrogen rates on the split plot of each block. The results showed that common rust severity increased with the increasing rates of nitrogen. The hybrids AG 303 and AG 9012 were more affected by rust than the hybrids AG 12 and AG 28. The hybrids AG 28 and AG 303 presented more incidence of stalk rot than the other hybrids. Despite of being one of the most affected by the diseases, the hybrid AG 9012 was the most productive.
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