FORMULAÇÃO DO COMPOSTO ORGÂNICO DE RESÍDUOS DE CANA-DE-AÇÚCAR ENRIQUECIDO COM FONTES DE FÓSFORO

Abstract

The hypothesis tested is whether the compound formed by filter cake, chicken litter and gypsum enriched with phosphate rock (RP) in association with phosphorus-solubilizing bacteria (PSB) increases the P availability. The experimental design was a factorial with 6 treatments and 5 replications evaluated in 3 seasons, totaling 90 experimental plots. The treatments consisted of the plant's standard treatment (T.P), represented by T1 (5.5 t of filter cake + 4.0 t of chicken litter + 0.5 t of gypsum); T2: T.P + Natural Phosphate (FN); T3: T.P + FN + product based on phosphorus-solubilizing bacteria (Biomaphos); T4: T.P + triple superphosphate (SFT); T5: 7.0 t of filter cake + 2.5 t of chicken litter + 0.5 t of gypsum + SFT); T6 – 6.0 t of filter cake + 4.0 t of chicken litter. Temperature and humidity were evaluated every ten days, and chemical analyzes were carried out at 45, 65 and 115 days of composting. Statistical analysis was performed using the SISVAR software, using the Tuckey test with a significance of P < 0.05. The variables P2O5, K2O, Ca, Mg, pH, M.O. and C.O were influenced by time. The variables N, S and Humidity did not show a significant effect. The solubilizer application did not influence the P available. No difference was observed in the P content using the natural phosphate and the soluble source of phosphorus. Gypsum did not reduce nitrogen volatilization in the composting process. There is no difference between the proportions of raw materials.