Ключевые слова: agriculture, background, bacteria, bean, biology, botanical, botany, closeup, concept, ecology, environment, fertilization, field, fresh, grow, growth, knot, legume, microscope, natural, nature, nematodes, nitrogen, nitrogen cycle, nitrogen fixation, nitrogen gas, nodule, nodules, nutrient, nutrition, organic, pea, plant, rhizobium, root, root bacteria, root nodule, root pea, science, soil, soybean, study, symbiosis, vegetable,