The beneficial effect of humic acid on plant growth may be attributed to the promotingeffects on nutrient uptake and nutritional status especially nitrogen, potassium andphosphorous necessary for plant growth. In addition, it is acting as a source of plantgrowth hormones, carbohydrates, amino acids and vitamins. The algae extraction effects oseedlings may refer to algae extraction contains the nutrient elements and growth hormonesthat increased the seedling growth.(Mohamed Abbas, 2013)!
There's no information about the organic vs conventional chemical composition of broad beans.