Letting your grass grow tall and then cutting more than 1/3 of the leaf off is called scalping, and is very damaging to your lawn. Mowing grass too low can cut into the crown of the plants and also cause damage.
Make sure your mower blades are sharp in order to make a clean cut into the blades of grass. Dull blades tear the grass and cause discoloration at the tips due to the frayed grass blades which lose moisture quickly.
Raise the mower height when mowing a lawn that's recovering from drought, insect damage or disease.Fertilization
Recycle grass clippings to reduce water loss, lower soil temperatures and return nutrients to the soil.