PREVIOUS CROP AND NITROGEN FERTILIZATION ON CORN YIELD IN IRRIGATED NO TILLAGE SYSTEM

Nitrogen is a nutrient that contributes positevely to corn productivity and is important, when planted in crop rotation associated with espécies vegetais que sejam capazes de contribuir para adição desse nutriente ao solo, que poderá ser disponibilizado para a cultura sucessora. This research was carried out at Experimental Nucleus of Agrarian Science of the Federal University of Mato Grosso do Sul, in 1998/99 crop season, in Dourados – MS. Experimental design used was randomized blocks in split plots with three replications. In plots the effect of black oat (Avena strigosa Schieb) and Raphanus sativus L., var. oleiferus a Metzg and in subplots nitrogen doses (0; 60; 90 and 120 kg ha-1) as covering was applied in C-855 triple hybrid corn in irrigated no tillage system were evaluated. Previous crop and nitrogen doses did not influence stem diameter, plant height, ear index, ear length and diameter. Independent of nitrogen doses, corn sew after Raphanus sativus showed the greatest grain yield.