Effects of Humic Acid and Plant Growth Promoting Rhizobacteria on Growth and Yield of Soybean (Glycine max L.)

Abstract

Soil degradation and low nutrient availability remain major constraints in soybean production. The use of organic amendments such as humic acid and biological agents such as Plant Growth Promoting Rhizobacteria (PGPR) has been widely promoted as a sustainable strategy to improve soil quality and crop productivity. This study aimed to evaluate the effects of different dosages of humic acid and PGPR on the growth and yield components of soybean (Glycine max L.) var. Dering 1. The experiment was conducted from September to December 2024 at the Agrotechnopark, University of Jember, using a randomized complete block design with three treatments (0, 10, and 20 mg) and five replications. Observed parameters included plant height, number of leaves, number of branches, and number of pods. Data were analyzed using analysis of variance (ANOVA) followed by Duncan Multiple Range Test (DMRT) at a 5% significance level. The results showed that humic acid at 10 mg significantly increased plant height, while the 20 mg dosage enhanced branch and pod formation. PGPR application showed a dose-dependent response, with the 20 mg treatment producing the highest values for all observed parameters. These findings indicate that humic acid and PGPR improve soybean growth through different mechanisms and have strong potential to support sustainable soybean cultivation.

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DOI: https://doi.org/10.46676/ij-fanres.v7i1.602

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