Seed treatment with phytosanitary products and interaction with pre-inoculation in soybean

Helen Mariana Cock Protzek (), Alessandro Lucca Braccini (), Silas Maciel De Oliveira (), Rafaela Tavares Costa () and Adriana Pereira Da Silva ()

Canadian Journal of Agriculture and Crops, 2025, vol. 10, issue 1, 31-40

Abstract: Pre-inoculation offers logistical advantages for soybean cultivation by eliminating on-farm inoculation, but little is known about its interaction with phytosanitary products. This study evaluated the effect of seed treatment with pesticides combined with pre-inoculation performed 10 days before sowing, without bacterial protectant, on soybean nodulation and yield. Field trials were conducted in six locations in Paraná and Mato Grosso do Sul states using a randomized block design with five treatments: (1) absolute control (no inoculation or nitrogen fertilization); (2) mineral nitrogen control (200 kg N ha-1); (3) standard inoculation with Bradyrhizobium spp. at sowing; (4) pre-inoculation with Bradyrhizobium japonicum + insecticides (imidacloprid + thiodicarb); and (5) pre-inoculation with B. japonicum + fungicide (fludioxonil + metalaxyl-M) + insecticide (thiamethoxam). Parameters assessed included nodulation, plant biomass, nitrogen accumulation in shoots and grains, and yield. Pre-inoculation with pesticides promoted nodulation and productivity comparable or superior to standard inoculation. Across all sites, pre-inoculated treatments outperformed the absolute control, and in most sites they also surpassed mineral nitrogen fertilization. The results demonstrate that pre-inoculation carried out 10 days before sowing, in combination with chemical seed treatment, is an effective strategy to enhance nodulation and yield in soybean cultivation.

Keywords: Glycine max; pre-inoculation; seed treatment; Bradyrhizobium japonicum; biological nitrogen fixation; bioinputs; crop yield; pesticides. (search for similar items in EconPapers)
Date: 2025
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