To grow, a lawn needs a certain amount of nutrients that it absorbs from the soil. Fertilization is the way to replenish the soil's supply of nutrients. Over time, if fertilizer is not added to the soil, the reserve will be depleted and the lawn will decline.  Three elements are essential for the growth of a healthy, long-lasting lawn: nitrogen, phosphorus and potassium. Since most Quebec soils are rich in phosphorus, the professional fertilizers used by the Nutrite Experts Network do not contain any. Balanced fertilization will result in a dense, vigorous and healthy lawn. It will also help the lawn better resist harmful organisms (diseases, insects and weeds). If you fertilize your lawn by yourself, be sure to follow the manufacturer's dosage and instructions. Applying more fertilizer will not make your lawn look better or greener. In fact, it may cause more harm than good to the lawn and its environment.