Adubação nitrogenada e redutor de crescimento na produtividade e qualidade fisiológica de sementes de trigo

Abstract

Wheat (Triticum aestivum L.) is a widespread crop worldwide, whether in the form of grain or its numerous derivatives obtained by industrialization. The fertilization with nitrogen is critical to increasing productivity. Therefore, in the technical recommendations, the dose of nitrogen to be used is based on the expected crop yield, organic matter content of soil and the previous crop. Growth reducers can be coupled with nitrogen decreasing the chances of lodging and further increasing the productivity and quality of grain. Thus, the aim of this study was to evaluate the seed performance of wheat cultivars produced under different N fertilizer doses and concomitant application of growth reducers. The study was performed in 2013 at Cerofeju farm in the municipality of Redentora - RS. The experiment was designed in randomized blocks with three replicates, composed by fifteen wheat cultivars prevalent in the region and of different technological classes. Urea was used as nitrogen source at doses of 100, 200 and 300 kg ha-1 and the growth reducer Moddus® at recommended dose and period. The increase in urea doses led to higher yields and higher physiological quality of wheat seeds.