Buystar Extra NPK 15-05-30 + 13 SO3 is a microcrystalline fertigator that is characterized by total and immediate solubility, for the presence of Sulfur and RyZea, which in synergy stimulate the growth and development of the plant. Due to the presence of Sulfur, Buystar Extra NPK 15-05-30 + 13 SO3 has the ability to acidify the solution, to free the mineral elements locked in the soil/substrate from retrogradation and to improve the absorption which is conveyed rapidly with the RyZea biological activator that enriches the formulation of the components that are able to enhance plant metabolism, soil-based processes and naturally chelate the nutrients provided or already present in the circulating solution.