The nitrogen in grain yield and at lodging oat cultivars

While promoting yield gains, nitrogen can bring huge losses by lodging. The work aimed to analyze the behavior of oat elite cultivars pattern of resistance and susceptibility to lodging the use nitrogen for grain yield and effects on lodging in favorable and unfavorable years of cultivation in Augusto Pestana and Capão do Leão on Rio Grande do Sul. Propose the recommendation of high grain yield cultivars with reduced lodging, independent of the agricultural year and indicate the breeding programs potential genotypes for advances in grain yield with resistance to lodging. The study was conducted in 2013 and 2014 in Capão do Leão and Augusto Pestana, RS, Brazil. The experimental design was a randomized block with four replications, following a factorial model in the use of three nitrogen doses (30; 90 and 150 kg ha-1) and eight elite cultivars with contrasting patterns of resistance and susceptibility to lodging.The grain yield and lodging were strongly influenced by year of cultivation. Brisasul showed high grain yield with greater resistance to lodging at the conditions of fertilization with nitrogen, independent of years and location of cultivation. The Brisasul cultivar, of reduced plant lodging and URS Corona of high grain yield, look promising in the development of segregating populations simultaneously adding favorable alleles for these traits.