MANAGEMENT OF COMMON VETCH (Vicia sativa L.) FOR CORN GROWN IN SUCCESSION UNDER NITROGEN FERTILIZATION
2007
PAULO REGIS FERREIRA DA SILVA | ADRIANO ALVES DA SILVA | GILBER ARGENTA | MÉRCIO LUIZ STRIEDER | EVERTON LEONARDO FORSTHOFER
Nitrogen (N) is the nutrient which more frequently limits grain yield of species of poaceae family, such as the corn crop. One of the strategies to increase N availability in the soil is by using leguminous species as preceding crop. The objective of this study was to evaluate the effect of timing of vetch burndown as winter soil covering and herbicides types used in the burndown in corn agronomic performance grown cultivated in succession under nitrogen fertilization. Two experiments were performed during the growing seasons of 1999/00 and 2000/01, in Eldorado do Sul-RS, Brazil. In the first year, four management systems of common vetch as preceeding crop to corn cultivated under two N rates (0 and 70 kg ha-1) were tested. The variables evaluated were type of herbicides used and timing of vetch burndown. In the second year, besides the two N rates (15 and 120 kg ha-1), three times of vetch burndown were tested. In both years, the experimental design was of randomized complete blocks, arranged as a splitplot design, with four replications. The vetch burndown one day before corn sowing date increases corn grain yield as compared to burndown 15 days before sowing. As preceding crop, vetch does not need to be burndown with no-selective herbicides. The application of pre-emergent herbicide selective to corn crop is effective to vetch burndown. Nitrogen fertilization applied in side-dressing in corn crop increases its grain yield even when cultivated in succession to vetch.
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