Indicadores microbiológicos do solo reinoculado e coinoculado com bactérias fixadoras de nitrogênio associadas a micronutrientes na cultura da soja

Abstract

The objective of the study was to evaluate the microbiological indicators of the soil with reinoculation and coinoculation of Bradyrhizobium japonicum and Azospirillum brasilense associated with the use of cobalt and molybdenum in foliar application in the soybean crop. A randomized block design (DBC) was used, with six treatments and four replications, totaling twenty-four plots, with the following treatments: T1 (Control - no inoculation in coverage, only inoculation and coinoculation at sowing), T2 (application of foliar application of 150 mL ha-1 of Azospirillum brasilense), T3 (foliar application of 150 mL ha-1 of Azospirillum brasilense + 150 mL ha-1 of CoMo), T4 (foliar application of 150 mL ha-1 of Bradyrhizobium japonicum), T5 ( foliar application foliar application of 150 mL ha-1 Bradyrhizobium japonicum +150 mL ha-1 CoMo), T6 (foliar application of 150 mL ha-1 Bradyrhizobium japonicum + 150 mL ha-1 Azospirillum brasilense). Soil and plant samples were collected during the period of full flowering of the crop. Then, analyzes were carried out regarding the carbon of soil microbial biomass, soil microbial respiration, metabolic quotient, number of nodules, weight of nodules and productivity. It was concluded that reinoculation and coinoculation with Bradyrhizobium japonicum and Azospirillum brasilense associated with the use of cobalt and molybdenum in foliar application, provided benefits for all microbiological indicators and productivity components evaluated in relation to the control, reflecting on the productivity of the soybean crop.