02688naa a2200409 a 450000100080000000500110000800800410001902400420006010000200010224501040012226000090022650001040023552014550033965000220179465000120181665000220182865000180185065000100186865000100187865000210188865000290190965300240193865300280196265300150199065300210200570000170202670000180204370000220206170000170208370000200210070000220212070000180214270000200216070000190218070000230219977300560222221111602019-12-02       2019    bl uuuu     u00u1 u    #d7 a10.17660/ActaHortic.2019.1244.232DOI1 aOLIVEIRA, M. B.  aPaclobutrazol in the microbiota of a soil cultivated with Palmer mango tree.h[electronic resource]  c2019  aEdição do Proceedings of the XII International Mango Symposium, Baise, Guangxi, China, jul. 2019.  aThe soil and climatic conditions of the Brazilian semi-arid region allowed the expansion of the mango crops to serve the internal and external markets, through technologies for managing the production season with the use of plant regulators. This study evaluated the effect of different levels of the plant regulator paclobutrazol (PBZ) on the microbial activity of an Argisol cultivated with ?Palmer? mango, in the semi-arid region of northern Minas Gerais. The work was set up in a randomized block design with five levels of PBZ applied to the soil, equivalent to 0.75, 1.50, 2.25, 3.00 and 3.75 g of active ingredient per linear meter of canopy, in addition to one control, in four replications. For the evaluations, a composite sample formed by 15 sub samples of soil collected between 0 and 0.1 m depth and at 0.3 m around the trunk of the plant was used. PBZ was applied and soil respiration (evolution of C-CO2) was evaluated every seven days. At the end, carbon in the soil microbial biomass (MBC), soil microbial metabolic quotient (qCO2), and percentage of fungi or bacteria were determined by plaque counting. PBZ promoted a negative impact on the soil microbiota, increasing the damage with PBZ levels, indicated by the lower values of microbial respiration and MBC. PBZ levels greater than 0.75 g a.i. per linear meter of canopy promoted a marked reduction in MBC and higher levels of qCO2, an ecological indicator of microbiota stress.  aGrowth regulators  aMangoes  aMicrobial biomass  aPaclobutrazol  aFruta  aManga  aMangifera Indica  aRegulador de Crescimento  aBiomassa microbiana  aRespiração microbiana  aSemiárido  aVariedade Palmer1 aSALES, R. P.1 aXAVIER, A. A.1 aRIBEIRO, R. C. F.1 aKONDO, M. K.1 aMEGDA, M. X. V.1 aPEREIRA, M. C. T.1 aSANTOS, I. P.1 aFERREIRA, J. D.1 aMARTINS, R. S.1 aMOUCO, M. A. do C.  tActa Horticulturaegn. 1244, p. 151-158, jul. 2019.