The three nutrients do not add up to 100 pounds because they are bound with other compounds. When using any type of fertilizer, it's best to begin with a balanced formula. Side dressings of a particular nutrient can be added as needed for specific plants and conditions. The key is in those numbers. You don't want to add too much fertilizer.
Some people think if one cup is good, two cups is better.
Then they end up over-fertilizing. And the more you fertilize, the more you're going to have to cut your lawn. Over-fertilizing also causes excessive top growth in flowers or vegetable gardens. Mowing and Watering Along with a good feeding regimen, the right manicure will help keep your lawn healthy and happy. Watering is also key to keeping lawns lush and healthy, but don't overdo it, the experts caution.