Leaf to root : soybean nodule traits monitored non

Graphic representation of the research hypothesis on the correlation between leaf spectral signatures and the underlying nodule traits (number and total weight) under abiotic stresses (salt and drought). Soybean (Glycine max) forms symbiotic root nodules with nitrogen-fixing rhizobia, converting atmospheric nitrogen into ammonia and reducing reliance on synthetic fertilizers. Nodule number and weight are key indicators of symbiotic efficiency and yield potential, yet current quantification relies on excavating roots, excising nodules, and weighing them manually.