The impact of nitrogen on oat Avena sativa L. development and output under the effects of repeated cutting stress

A field experiment was carried out during season 2018-2019 at one of the Warka fields to study the effect of nitrogen levels and the number of cuts on the growth and yield of oat grains. The experiment was carried out according to the split-plot design using a Randomized Complete Block Design (RCBD), with three replicates for each treatment. The nitrogen levels of agriculture (0, 60, 120 and 180) kg N. ha-1 were the main plots, as for the secondary properties, they were represented by the number of times of cutting (without a cut, one and two-time cutting). The results showed significant superiority in the level of fertilizer 180 kg ha-1, on the qualities of the plant height (100.98 cm), the number of the grains (49.55 grains. dahlias-1), dahlias number (424.7 clusters m-2), stem to leaf ratio (6.71), green fodder yields (25.08 tons ha-1) and the biological yield (3.667 tons of ha-1). The results of the cutting showed that it was superior to the treatment of the two-time cutting on green fodder yield (22.17 tons ha-1), treatment without cutting on grain yield (3.53 tons ha-1) , the combination (180 kg ha-1 × two-time cutting) showed significant superiority on plant height (107 cm), green fodder yield (25.27 kg ha-1) and the number of the grains in the dahlias (50.26 grain. dahlias-1), also (120 kg ha-1 × without cutting) outperformed on the dahlias number (392.9 m2).
 
Keywords: Nitrogen; oats Avena sativa L.; repeated cutting stress