You should calibrate your spreader using the manufactures instructions included in new spreaders. Convenient applicators are available to make it simple and easy. Both lawn and general plant formulas are produced. Most of the lawn formulas have higher Nitrogen percentages. With a water soluble fertilizer it is much harder to cause damage to your plants by burning.
Several companies make quality products of a soluble fertilizer.
Even distribution is the main goal you should work toward in lawn fertilization. Always fertilize when the grass is dry. Fertilizers are applied to the grasses according to the growing season . The warm season grasses receive more fertilizer on the average than the cool season grasses. Cool season grass must prepare food storage for the winter and don t need the excess growth that nitrogen brings in creating excess foliage above ground.