Use of microalgae as biofertilizer in soybean cultivation

Abstract

The use of microalgae biofertilizers for agriculture is a sustainable measure that brings several benefits to the environment. Among them, biological balance of the soil, provides improvements in physical, chemical and sanitary conditions; reduces the use of chemical inputs, and also helps to capture atmospheric CO₂. Thus, the objective of this work was to evaluate the feasibility of using microalgae as biofertilizers in the initial growth of soybean variety Brasmax Olimpio IPRO. The experiment was carried out under field conditions at Ação Ecológica Guaporé, Rolim de Moura – RO, using soil classified as a eutrophic Red-Yellow Oxisol. The experimental design used was randomized blocks, with five doses of microalgae biofertilizer and five replications. Specifically, plant height, stem diameter, root growth, leaf area, fresh and dry mass of the shoot and root dryness were evaluated. The results obtained indicated that the linear dose of 8.10 mL m^-1 provided greater leaf area. While the fresh and dry mass of the aerial part and dry root was the linear dose of 6 mL m^-1, 26 days after sowing.