Aspectos fisiológios de sementes, produtividade de grãos de trigo submetidos a doses de nitrogênio, inoculação e aplicação foliar de Azospirillum brasilense

Abstract

The use of chemical fertilizers as well as providing greater productivity, is costly. The use of bacteria of the genus Azospirillum brasilense represent a potential tool to reduce production costs while improving productive potential of crops using environmental resources. It is also known that the search for an increasingly sustainable and productive agriculture is increasingly discussed, and within that reality, we seek new technologies to improve the producer's profit margin. Within this context, the objective of this research was to evaluate the wheat yield, inoculated or not with A. brasilense, subjected to N rates, seed treatment and physiological quality of the seeds. Chapter I aimed to evaluate the compatibility of Azospirillum brasilense bacteria fungicide (difenoconazole) and insecticide (thiamethoxan), and physiological quality in wheat seeds. The wheat seed retains its quality when it checks the germination, vigor and independent accelerated aging grow, use or not of fungicide, insecticide and Azospirillum brasilense. The insecticide thiamethoxam increased the length of shoot and root and provides compatibility with Azospirillum brasilense and fungicide inhibits the length of shoot and root and is antagonistic bacterium A. brasilense. In Chapter II objective was to evaluate the agronomic performance of wheat cultivars submitted to nitrogen doses and inoculation of Azospirillum brasilense in seed and foliar application. Inoculation foliar alone or jointly via seed treatment increased grain yield and other yield components of all cultivars. Among the cultivars tested the TBIO Sinuelo stood out, with inoculation response in the two years of study, confirming the good potential of the leaf inoculation.