The general rule of thumb is to fertilize cool season turf grasses, e.g., bluegrass, fescue or ryegrass in the fall months and warm season grasses, e.g., bermuda, zoysia and St Augustine in the summer months. Combination products of fertilizer with pesticides can provide excellent results. However, care must be taken to use the right product for the intended situation and to follow the directions on the label. With fertilizer, more is never better.
If you just bought a manual miter box, a simple modification will extend its useful service life. Insert and fasten a piece of 1x stock to the inside bottom of the box. The saw blade will then cut into the false bottom, without damaging the miter box itself. Occasionally move the wood back and forth, or turn it over, to spread out the wear. When badly cut up, just replace the piece.