Polyvinylpyrrolidone (PVP) and Na-Alginate Addition Enhances the Survival and Agronomic Performances of a Liquid Inoculant of Bradyrhizobium japonicum for Soybean (Glycine max (L.) Merr.)

Nontoxic polymers PVP and Na-alginate may provide a favorable environment for the survival of bacteria. Therefore, were added to growth medium develop liquid inoculant Bradyrhizobium japonicum strain. The strain was identified by 16S rDNA sequencing. addition (1.8%) (0.2%) in promoted better (1.93 × 109 cells mL−1) B. compared control (3.50 102 after 6 months storage. combination ensured 1.53 107 mL−1 up 12 storage under ambient temperature (28 ± 2 °C), whereas or alone produced similar cell counts only 8 months, respectively. Consecutive field experiments proved efficacy on nodulation yield soybean. Na-alginate-based inoculation significantly increased nodule number per plant, pods seeds pod, seed yield, hectare (p ≤ 0.05). Thus, PVP- has great potential popularize organic cultivation