Potassium plays an essential role in a plant’s metabolic processes and is a vital source of nutrients for crops. Above all, potassium has a beneficial effect on the yield and quality of crops and promotes the production of carbohydrates. Magnesium improves soil structure and gives plants deep green leaves. When it comes to potassium fertilizers, you can choose between products that are low in chlorine and those that are high in chlorine. View the full range below.