PRODUCTIVE CHARACTERS SORGHUM HYBRIDS SS-318 SUBMITTED TO LEVELS OF NITROGEN

Abstract

ABSTRACT: Aim to obtain quality of forage it is necessary to management it with fertilizers, in appropriate levels and forms, therefore. It was developed a research to evaluate three levels of nitrogen on morphogenic and productive characteristics of sorghum hybrid SS318. The experiment was carried out in the period from June to September, 2015, at the Experimental Farm of UFOPA, the area was prepared with two harrows. The experimental design was completely randomized, with three treatments (80, 120 and 160 kg.ha-1 of nitrogen) and four replications. After 35 days post seeding were measured morphometric variables and after 90 days were measured morphometric variables and productivity of sorghum. The number of leaves and tillers measured after 35 days did not differ significantly. There was variation of height due to the levels of nitrogen (0.61 to 0.55 m). After 90 days, there was differences in this variables: number of live leaves, whose averages ranged from 6.60 to 5.39 leaves.plant-1, number of tillers, averaging 1.27 to 0.85 tillers.plant-1, and height was ranging from 1.94 to 1.80 m. There was not differences into levels of nitrogen in this variables: number of dead leaves, plant population, bedding, broken plants, green and dry matter of leaf, stem and panicle. There was not increase in productive characters with levels of nitrogen above 80 kg.ha-1.KEYWORDS: Biomass, Dry matter, Nitrogen fertilization, Sorghum bicolor.