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Approaching the issue of fertilizers with organic substances of the bio stimulants class is a difficult task as the concept is far from complete elucidation. As concerned the use in agriculture of these products, legislation, research, and experimental activities are still incipient. Any substance or microorganism applied to plants with the purpose to enhance nutrition efficiency, abiotic stress, and/or crops quality features regardless of their nutrient content can be generally defined as a product with bio stimu...