Abstract
The present study refers to the results obtained in four experiments carried out in the 2015/2016 crop: Toledo/PR; Palotina/PR; Cascavel/PR; and São Miguel do Iguaçu/PR. The objective of the present study was to evaluate the agronomic efficiency of Azospirillum brasilense (pest strains Ab-V5 and Ab-V6) in four distinct rice culture regions (Oryza sativa L.). The tests were performed to meet the requirements of the Ministry of Agriculture, Livestock and Supply regarding the registration of the product. The experiments were conducted in a randomized block design with seven treatments and four replications, totaling 28 plots each. Rice cultivar IAC 201 was used in all four experiments. At stage R7, 10 plants were collected to measure morphobiometric variables and nitrogen content in grains (N grains). The results showed that in all evaluated sites the use of liquid inoculation with A. brasilense increased rice crop development as well as productivity. Thus, inoculation of rice seeds with A. brasilense strains Ab-V5 and Ab-V6 based inoculant in the liquid formulations increased the yield and yield components of rice crop in different regions. The inoculant based on A. brasilense strains Ab-V5 and Ab-V6, using the liquid vehicle, presented higher agronomic efficiency for rice cultivation. The inoculant based on A. brasilense strains Ab-V5 and Ab-V6 using the peat medium has good agronomic efficiency similar to the standard inoculant. These results were satisfactory contributing also to the sustainability in the agriculture. Key words: Diazotrophic bacteria, plant growth promoting bacteria, nitrogen fertilization, seed inoculation, Oryza sativa L.  
Highlights
Rice (Oryza sativa L.) is a cereal that is present daily in the diet of much of the world's population, being one of the most widespread crops in the world (Areias et al, 2006)
It is possible to verify that the same treatment did not differ from 40 kg ha-1 N + inoculation with A. brasilense liquid inoculant at a dose of 150 mL inoculant for 25 kg of rice seeds for all variables tested (T6) (Table 3)
The lowest averages determined in this experiment occurred for all variables in the control treatment (T1), which was devoid of inoculation with A. brasilense and nitrogen fertilization (Table 3)
Summary
Rice (Oryza sativa L.) is a cereal that is present daily in the diet of much of the world's population, being one of the most widespread crops in the world (Areias et al, 2006). In relation to the world ranking in recent years, Brazil is always among the top ten producers of O. sativa compared to Latin American countries (CONAB, 2016). These results are important because there is a small gradual reduction in the country over the same period of rice acreage. In this scenario, the state of Paraná maintains its prominence, as it does not present large production fluctuations, currently guaranteeing the 7th position in the national ranking of producers of this crop
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