Pemanfaatan Biokomposit Mikrobiome Lumpur Lapindo dan Endofit Alang-Alang untuk Perbaikan Lahan Marginal dan Pertumbuhan Vegetatif Kedelai pada Kondisi Stres Abiotik

Soybean is a strategic crop facing productivity challenges due to limited fertile land and agricultural expansion into marginal lands. This study aims to explore the potential of biocomposite from Lapindo mud microbiome and cogongrass (Imperata cylindrica) endophytes as biological agents to support the growth and increase productivity of soybean plants under abiotic stress conditions. The research was conducted at the Biotechnology Laboratory and Educational Garden of the Faculty of Agriculture and Animal Science, University of Muhammadiyah Malang from July to October 2025. The experimental method used a Randomized Block Design (RBD) with 6 treatments and 4 replications. A total of 25 bacterial isolates with diverse morphological characteristics were obtained. Hypovirulence tests showed several isolates were safe toward cucumber seeds. Phytohormone content tests showed isolates could produce IAA in the range of 45,89 -80.02 ppm and gibberellin with absorbance ranging from 14,29 - 342,86 ppm Drought stress tests showed isolate D.7.3 produced the best growth with root length 5.33 cm, plant height 10.67 cm, and weight 0.65 g. In vivo tests in vegetative phase showed treatment T3 produced the highest plant height (45.55 cm) and treatment T5 produced the most leaves (28.75). The biocomposite based on Lapindo mud microbiome and cogongrass endophytes has the potential as an eco-friendly biofertilizer to increase soybean productivity in marginal lands.