Temperatures should begin to heat up in May, so we are looking at increasing the irrigation schedule to about 75% of a summer schedule.
As the weather heats up, be looking for areas of the lawn that seem to be fading or drying out more than others. If the whole lawn is dry, then more watering (and possibly fertilizer) is needed. If only sections of the lawn look stressed, then the cause is probably unequal distribution of water – some parts are getting plenty of water while others are not getting enough. In this case, it is best to find out how to improve the amount of water the faded parts are getting, rather than increasing the water on all of the lawn.
Sometimes sprinklers are misdirected, and simply need to be adjusted so that they cover the drier areas. Many sprinklers can be adjusted for distance and angle. If you cannot adjust yours for angle, most manufacturers make adjustable nozzles for given models, and they should be found at a local hardware store that carries the manufacturer’s products.
Keep in mind that you are also looking for head to head coverage, meaning that each sprinkler should reach all the way to the neighboring sprinkler. This is because water tends to spray up and out from a sprinkler head, so the immediate perimeter around a sprinkler gets little water unless a neighboring sprinkler is reaching that area. If your dry areas surround your sprinklers, this is probably what is happening. To better understand how to adjust your sprinklers, look at the top of your sprinkler body, and you will probably see a manufacturer and model number. By going on line, you should be able to find all of the information you need regarding your particular sprinkler. The more you understand your system, the better able you will be at solving your irrigation issues.