Full Length Research Paper
ABSTRACT
In order to optimize the use of nitrogen (N), the aim of this work was to evaluate the efficiency of foliar application of Azospirillum brasilense Ab-V5 strain, as regards the productivity of wheat plantations combined with different N doses. The experiments were carried out in four municipalities in Minas Gerais (Brazil) under randomized block design with four replications. Forty percent of the N dose was applied at planting time and 60% as topdressing at tillering stage of the crop. Azospirillum brasilense was applied as foliar spray at a dose of 500 ml/ha. The treatments consisted of: (1) Control-without N or Ab-V5; (2) 50% of the N recommended; (3) 100% of the N; (4) Application of Ab-V5 strain; (5) 50% of N and Ab-V5 strain; (6) 100% of N and Ab-V5 strain; (7) 100% of N and seed inoculation with a commercial product (Master Fix). For all the locations, productivity increased with application of 100% of N recommended and foliar spray containing A. brasilense compared to the treatment that had only 100% of N recommended.
Key words: Foliar spray, nitrogen fertilization, diazotrophic bacteria, Triticum aestivum L.
INTRODUCTION
MATERIALS AND METHODS
RESULTS AND DISCUSSION
Three groups of treatments were performed in Uberaba and Patos de Minas municipalities and two groups in Lambari and Madre de Deus de Minas. For all of them, the use of 100% N + Azospirillum via foliar spray yielded the best results. For the treatments with no application of A. brasilense (0, 50 and 100% of N) the productivity was significantly lower compared to the treatments with Azospirillum, however they belonged to the same group (Table 3). This lack of response may be related to the residual effect of N fertilizers applied to cultivate previous crops in all of these areas. In these regions the adoption of crop rotation system with leguminous and horticulture crops which leaves high amounts of N in the soil is common. It ensures the positive effect of Azospirillum on the N use efficiency.
CONCLUSION
CONFLICT OF INTERESTS
ACKNOWLEDGEMENTS
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