Fecha de publicación: -- Fuente: WIPO "tomato" The disclosure relates to compositions comprising Lignin derivatives having molecular weight in the range of 300 Da to 50 KDa. The disclosure further relates to the use of these compositions for improving soil pH, converting unavailable forms of minerals into bioavailable forms, improving nutrient use efficiency in plants, overcoming ionic and osmotic stress, and controlling soil-borne diseases and pests.