It appears three 15’ maple trees display iron chlorosis this year, yellow leaves, green veins. Relatively heavy mostly clay soil. I have watered about 1” weekly but not enough to waterlog the soil. I read about watering and mulching. Is a soil test warranted, and if so how do Igo about getting one? (I live close to the UM St Aul campus.). Or more generally, your recommendation how to proceed. Thanks!!