Can you post pictures? Are you sure the white grass is not white flowers on lime green grass?

Looks white to me

A good lawn needs frequent watering. Also, before using fertilizers, it is necessary to spill the soil very well. It is even better to fertilize after rain. But you also have a dry climate, you could use a traveling sprinkler. It was the best solution for me. Now I have a big, great and juicy lawn. This wheel sprinkler works long distances due to its increased range and powerful water pressure. You can choose yourself any sprinkler for your needs. Carefully read the specifications: https://welcoming-house.com/best-traveling-sprinklers/ so that the power corresponds to the area of your lawn.