Did you know there is a rule for applying chemicals, fertilizer, etc on your lawn or pastures during times of summer heat stress?
It is called the “150 Rule”. The rule states that if the temperature and humidity added together is 150 or more do not apply anything to your lawn. The chances of burning the grass is multiplied significantly at this point.
What if you have to add something during the hottest part of the year? Only do it if absolutely necessary. Do it in the morning when temperatures are coolest. Apply water afterwards if it calls for it or if product is not compromised by adding water to grass. Also, try watering in the middle of the day to cool turf and help lower stress levels in the grass.