Lawn fertilizing should be done on a program and revisited on a regular basis. We space our visits out 6 weeks and continue throughout the growing season to ensure a balanced nutrient program. The grass absorbs the nutrients the best during the cooler seasons (in the northeast) as this is when the grass is actively growing. We typically lime in Fall although Spring is also a viable option.
To determine the proper nutrients, you can choose to have your soil tested at the University of Massachusetts. A benefit of having your soil tested is that it prevents over- or under-fertilization by determining just what kind of nutrients your plants and lawn need. Each fertilizer bag will have the three numbers on it that tell you the percentage of nitrogen (N), phosphorus (P), and potassium (K) contained in the mixture.
If you apply fertilizer, make sure you follow the directions exactly. Proper storage and disposal of these chemicals are important. Spring application of fertilizer is usually the best time for lawn fertilizing. You may also want to consider using organic material to create a healthier environment. If you only do lawn fertilizing once a year, make sure you do it in the fall.
You need to understand which nutrients your lawn needs and which type of fertilizer to lay down on it. If you can, you should fertilize your turf in the spring and in the fall when it is still cool. Determining the best fertilizing regimen for your lawn care may take more time and effort than you are able to give, so turning to a professional landscaping company may be a better investment of your time and money.