Soil quality and yield attributes of soybean on an Ultisol conditioned using cogongrass biochar enriched with nitrogen fertilizer dissolved in seaweed extract by Muhammad Harjoni Kilowasid, Imas Nur Cahyani, Febrianti, Muhammad Aldi, Nini Mila Rahni, Syamsu Alam, Suaib, Teguh Wijayanto, Rachmawati Hasid, Dirvamena Boer, Abdul Madiki, Hamirul Hadini, Norma Arief, Muhidin, Andi Nurmas, Makmur Jaya Arma, Wa Ode Nuraida

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