NODULATION OF COMMON BEAN CULTIVARS WITH DIFFERENT LAND USE TYPES

Abstract

Beans are a crucial food source for both the Brazilian and global populations' food security. Studying the factors affecting nodulation by nitrogen-fixing bacteria in this crop is paramount for developing socially and environmentally favorable production models for both producers and society. This study aimed to investigate the interaction between bean varieties and nodulation by rhizobia from soils subjected to different preparations and land uses in the Zona da Mata region of Minas Gerais, Brazil. Nodulation of five bean cultivars grown in soil samples from areas with different management types was evaluated. The assessed management types were: Agroecological Horticulture system (Horticulture), agroforestry system (AFS), monoculture (Corn), and secondary forest (Forest). The experiment followed a completely randomized design in a 5 x 4 factorial arrangement with 4 replications and was conducted at the Rio Pomba Campus of IF Sudeste MG. Evaluated variables included Root Dry Mass (RDM), Aboveground Dry Mass (ADM), Nodule Dry Mass (NDM), Total Number of Nodules (TNN), Number of Primary Nodules (PN), Number of Secondary Nodules (SN), and Number of Tertiary Nodules (TN). Different soil managements affected nodular population, with plants grown in horticulture soil showing higher nodulation values. The different bean cultivars showed no difference in nodulation. Nodulation followed a pattern of occupying tertiary roots. These results contribute to understanding the effects of soil management on the rhizobia-bean association process, indicating ways to enhance this beneficial association.