Olivine melilitite powder applied in association with bacterial inoculation impacts soil microbiological attributes

作者：Jardel Galina, Genicelli Mafra Ribeiro, Dilmar Baretta, Carolina Riviera Duarte Maluche Baretta · 发表于：Scientia Agricola · 年份：2024 · DOI：10.1590/1678-992x-2023-0214 · 被引用次数：4 · 研究领域：Soil Carbon and Nitrogen Dynamics、Clay minerals and soil interactions、Coal and Its By-products

ABSTRACT This study aimed to evaluate the impact of the combination of olivine melilitite powder with bacterial inoculation on soil microbiological attributes. The experiment was conducted in a randomized block design (n = 4), with the following treatments: chemical fertilizer (CF), fertilizer reduction + remineralizer (FRR), fertilizer reduction + remineralizer + Azospirillum (FRA), fertilizer reduction + remineralizer + Bacillus (FRB), and fertilizer reduction + remineralizer + co-inoculation of Azospirillum and Bacillus (FRC). A 25 % reduction of chemical fertilizer was tested in FRR, FRA, FRB, and FRC for two years. The microbial biomass carbon (MBC), soil basal respiration (SBR), microbial quotient (qMIC), metabolic quotient (qCO 2 ), and grain yield (GY) of maize were evaluated. The results indicated that the soil from treatments FRA (515.72 mg microbial C (carbon) and 2.28 %), FRB (547.43 mg microbial C and 2.65 %), and FRC (529.64 mg microbial C and 2.38 %) exhibited the greater values of MBC and qMIC. The highest qCO 2 values were found in the soil of FRR (5.55 µg C-CO 2 µg MBC) and CF (5.84 µg C-CO 2 µg MBC), indicating stress effects on the microbial community. However, following the first cultivation, this effect was reduced in FRR due to the application of olivine melilitite. Moreover, MBC (R 2 = 0.46), qMIC (R 2 = 0.35), and SBR (R 2 = 0.79) exhibited a positive correlation with maize GY, while qCO 2 (R 2 = –0.33) presented a negative correlation with GY. This s...