COINOCULAÇÃO DE Bacillus sp. e Azospirillum brasilense E ADUBAÇÃO FOSFATADA NO CRESCIMENTO, NUTRIÇÃO E PRODUTIVIDADE SUSTENTÁVEL DA SOJA

Abstract

COINOCULATION OF Bacillus sp. AND Azospirillum brasilense AND PHOSPHATE FERTILIZATION ON GROWTH, NUTRITION AND SUSTAINABLE PRODUCTIVITY OF SOYBEAN

Abstract

Soybean is one of the main agricultural crops in Brazil, and the search for sustainable alternatives to increase its productive efficiency has driven the use of plant growth-promoting microorganisms associated with nutritional management. The present study aimed to evaluate the effects of coinoculation of plant growth-promoting bacteria associated with different phosphorus doses on soybean growth, nutrition and productivity. The experiment was conducted in the field during the 2023/2024 crop season in Chapadão do Sul, Mato Grosso do Sul state, using a randomized complete block design with five biological treatments and four phosphate fertilization levels (0, 50, 75 and 100% of the recommended dose). Agronomic characteristics, leaf nitrogen content, relative chlorophyll index and yield components were evaluated. The results showed that biological treatments significantly influenced the number of internodes, with emphasis on coinoculation with Bacillus licheniformis. Phosphorus doses promoted changes in internode length, relative chlorophyll index, number of pods and number of grains per plant. However, no significant effects were observed on leaf nitrogen content and grain yield. It is concluded that the coinoculation of plant growth-promoting bacteria and phosphate fertilization modified morphophysiological characteristics and productive components of soybean, but without significant effects on final yield under the studied conditions, highlighting the need for further studies to improve the integration of these technologies in sustainable production systems. Keywords: soybean; coinoculation; Azospirillum brasilense; Bacillus licheniformis; phosphorus; plant growth-promoting bacteria.