The oat panicle components were changed by the forms of nitrogen use influencing productivity.
The aim of the study was to determine the direct and indirect effects of oat panicle components on
grain yield by N-fertilizer rates in succession systems of high and reduced release of N-residual.
The study was conducted in the years 2013 and 2014 in a randomized complete block with four
replications in a factorial 3 × 2, for nitrogen rates (30, 60 and 120 kg·ha-1) and oat cultivars (Barbarasul
and Brisasul) the soybean/oat and corn/oat systems. The panicle weight and grain per
panicle show greater sensitivity to the change of nitrogen rates. Grain yield was favored by the direct
effect of harvest index panicle and indirect by grain weight per panicle. In the system soybean/
oat, the grain weight of panicle shows greater efficiency in promoting positive direct effects
on grain yield.
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