Fertilizante organomineral associado a Bacillus na cultura da soja

Abstract

The escalating global need for mineral fertilizers is spurring the exploration for highly effective alternatives. Organomineral fertilizers are emerging as promising options to replace conventional fertilizers, offering not only satisfactory productive results but also high sustainability. Therefore, this study aimed to verify the efficiency of organomineral fertilizer with the addition of Bacillus sp. in soybean cultivation. A factorial scheme of 3X3+1 with four repetitions was used, with the first factor composed of three fertilizer sources (organomineral associated with Bacillus sp., conventional mineral, and mineral with polymer), the second factor three fertilizer dosages (25, 37.5, and 50 kg.ha-1 of P2O5 and 200, 300, and 400 kg.ha-1 of K2O), and an additional absolute control without fertilizer application. Grain Yield (bags.ha 1), grain weight in 10 plants (g), thousand grain weight (TGW), total grain number, grains per pod, and sieve retention test (SRT) were evaluated. No significant effect (P>0.05) was observed for the sieve retention test, thousand grain weight, empty pods, and pods with 1, 2, and 3 grains. However, the organomineral fertilizer associated with Bacillus sp. demonstrated superior results compared to other treatments (P<0.05) for productivity and grain weight. In the case of the total grain variable, both the organomineral fertilizer associated with Bacillus sp. and the mineral with polymer performed similarly to each other and outperformed the conventional mineral fertilizer. It was observed that increasing fertilizer doses led to a significant increase in grain yield, grain weight, total grain number, and average number of pods. Furthermore, as the doses increased, there was a better fit to the linear regression model. Regarding pods containing four grains, the treatments receiving organomineral fertilizer associated with Bacillus sp. and the mineral with polymer exhibited similar and superior performance to conventional mineral fertilizer, respectively. Thus, the organomineral fertilizer associated with Bacillus strains presents a promising alternative to conventional fertilizers.