DEVELOPMENT AND PRODUCTIVITY OF MAIZE SUBMITTED TO THE NITROGEN INSTALLMENT IN COVERAGE

Abstract

THE OBJECTIVE OF THIS WORK WAS TO VERIFY THE RESULTS OF THE DIVISION OF NITROGEN FERTILIZATION WITH UREA IN THE CULTURE OF GRAIN CORN IN STAGES V4 AND V8. THE EXPERIMENT WAS CARRIED OUT ON THE PONTE ALTA FARM, IN THE MUNICIPALITY OF SILV�NIA-GO. THE EXPERIMENTAL DESIGN ADOPTED WAS THAT OF RANDOMIZED BLOCKS, WITH FOUR TREATMENTS AND FOUR REPETITIONS, BEING: T1 - ZERO; T2 - UREA 100% V4; T3 - UREA 50% V4 AND 50% V8; T4 - UREA 100% V8. THE NUTRITIONAL DEMAND OF THE CROP WAS ESTABLISHED ACCORDING TO THE ANALYSIS OF THE SOIL BEING 261 KG HA^-1 OF N. PLANT HEIGHT, STEM DIAMETER, GREEN MASS AND THE HEIGHT OF THE EAR INSERTION UNTIL FULL FLOWERING WERE EVALUATED. PRODUCTIVITY AT THE END OF THE EXPERIMENT. THE RESULTS WERE SUBJECTED TO ANALYSIS OF VARIANCE, AND WHEN THERE WERE SIGNIFICANT DIFFERENCES, IDENTIFIED BY THE F TEST (P <0.05), THE TUKEY MEANS TEST WAS APPLIED, USING THE SISVAR STATISTICAL PROGRAM, VERSION 5.6. THE MAIZE RESPONDED POSITIVELY TO NITROGEN COVER FERTILIZATION, IN ALL STUDIED CHARACTERISTICS. IN THE CONDITIONS OF SOIL AND CLIMATE OF THE ANALYZED AREA, THE FERTILIZATION OF NITROGEN COVER FOR THE DEVELOPMENT OF CORN IS MORE EFFICIENT WHEN THE APPLICATION OF N IN COVER IS CARRIED OUT IN THE VEGETATIVE STAGE V4, PRODUCTIVELY RESEMBLING THE DOSE DIVIDED IN V4 AND V8. THE LATE TOTAL NITROGEN FERTILIZATION, IN V8, DOES NOT HAVE A POSITIVE EFFECT ON PLANT DEVELOPMENT AND PRODUCTIVITY.