USO DE CARBONATITO FOSFÁTICO E DE MICRORGANISMOS BIOSSOLUBILIZADORES COMO FONTE DE FÓSFORO NA CANA-DE-AÇÚCAR

Abstract

In Brazil, most fertilizers are imported, and the search for sustainable alternatives such as soil remineralization is imminent. This study aimed to evaluate the physiological and biometric parameters of sugarcane cultivated with P sources, combined or not with the inoculation of biosolubilizing microorganisms. The experiment was conducted in a greenhouse using a randomized block design with four replicates. The P sources tested were phosphate carbonatite (100% PR), 50% PR + 50% single superphosphate (SFS), and 100% SFS, at a dose of 350 kg.ha-1 of P2O5 associated with the use of Bacillus amyloliquefaciens, Bacillus aryabhattai, Cladosporium cladosporioides, and Trichoderma harzianum, either alone or in coinoculation.The use of phosphate carbonatite provided a higher SPAD index, but due to its slow solubilization, it reduced sugarcane development. Replacing 50% of the SFS with phosphate carbonatite (50% PR + 50% SFS) provided phytomass production similar to that fertilized with 100% SFS, proving to be agronomically attractive. Inoculation with B. amyloliquefaciens, B. arybhattai, C. cladosporioides, and T. harzianum, and coinoculation with Ary + Cla and Amy + Ary + Cla, provided better sugarcane development when combined with soluble P sources.