Tucson - nitrogen deficiency
I did a lowe's soil test in my yard and found that I have a severe nitrogen deficiency. I suppose this would explain why my plants, e.g. Photinia and crape myrtles, have incredibly anemic growth. The leaves on the photinia are extremely small and they are not growing at all (the leaves also droop by noon).
I have ammonium sulfate which is 21-0-0. Will adding this to the soil resolve the nitrogen deficiency and fix the growth problem? Is it safe to add ammonium sulfate when the heat is above 100 degrees?