In such cases, high levels of fertilizer salts may actually result in movement of water out of plant roots. Schedules for fertilization have also changed over the years based on new knowledge of how plants use fertilizer. Years ago, spring turf fertilizations were much higher in nitrogen. Nitrogen fertilizer is still critical for quality turf in spring but the recommended amount is now lower. The key is to encourage your customers to follow the directions on the fertilizer labels of the products you sell.
Different fertilizers fit different situations.
Many wonder why there are so many different fertilizers. First, different plants need different combinations of minerals and different combinations are needed at different stages of plant growth. Nitrogen is arguably the most important fertilizer mineral. It plays a critical role in growth and can be lost in many ways from plants' roots due to leaching and other processes. Because of this, many fertilizers have nitrogen as their highest percentage, often in ratios two to four times higher than phosphorus and potassium.