The use of Vinasse-Enriched Aerated Compost tea Increases Plant Growth-Promoting Bacterial Populations and Stimulates Biomass Accumulation in Sugarcane Seedlings
摘要
This study aimed to evaluate the conditions for improved compost tea production and determine the effect of its application on the growth of sugarcane seedlings and abundance of rhizosphere bacterial populations. In vitro experiments were conducted in bioreactors and in vivo production in IBC tanks to determine the optimal conditions for increased bacterial populations. The best conditions to optimize compost tea production and increase microbial populations (nitrogen-fixing bacteria and phosphorus-solubilizing bacteria) were found to be a compost/water ratio of 1:20, 24 h processing time, and addition of vinasse (6 kg.1000 L−1) in constant aeration at 80–90 mg L-ppm. Aeration of the system was carried out by bubbling air. Bacteria identified in the compost tea belonged to the genera Priestia, Acinetobacter, and Klebsiella. Results indicated a direct relationship between application of compost tea, increase in sugarcane biomass and increase in the abundance of N-fixing bacteria and P-solubilizing bacteria in the rhizosphere.