Studies on the effect of nitrogen dose on the yield indicators of oats can help cultivation recommendations. This study aims to study the simulation of the productivity indicators of oats based on optimal dose of nitrogen on grain yield expression, under the agricultural stand conditions of high and low availability of nitrogen and favorable and unfavorable weather conditions. Studies were conducted in 2011 and 2012 years, in a complete randomized block design with four replications in a 2 x 4 factorial arrangement to cultivars (Barbarasul and Brisasul) and nitrogen doses (0, 30, 60 and 120 kg ha-1) in the soybean/oat and corn/oat succession system. In each succession system, two experiments were conducted, one for quantifying the production of biomass and another to estimate grain yield. The use of nitrogen introduced quadratic regression model on the grain yield and harvest index, showed linear behavior in the biological yield and straw in the two crop succession system. The difference of this behavior is caused by the biological, straw and also by year favorable or unfavorable. The simulation of the nitrogen optimal dose for the production of grain confirms major efficiency of Brisasul cultivar in the expression of grain yield indicators.
Key words: Avena sativa L., crop succession, nitrogen rates, yield indicators, simulation.
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