Over the winter we got some snow mold which seems to have caused some thatch build-up that I think is yellowing our lawn.
I highly doubt you have a thatch problem on a year old lawn. If you do, you are doing something seriously wrong.(over watering, over fertilizing etc)

12.50 sounds right to me. Prices of grains differ throughout the U.S.

1. Fertilizing: Fall and spring. I would use Soybean Meal 2x in the fall. Once when the summer heat breaks and again just before winter dormancy. Then In spring after your 2nd mowing you could apply Alfalfa or SBM. Then no later than June apply either Alfalfa or Milorganite(1/2 strength) only. No fertilizer applications in July or August.

2. You could safely spray Liquid Seaweed every 2-4 week during summer. Depending when the last time you fertilized was, you could use Milorganite @ 1/2 the recommended rate now, today, or tonight. But no later than tomorrow.

When, How much, and with what, was the last time you fertilized?

Thanks for the reply.

It looks like thatch or dead grass forming a mat just above the soil. I fertilized with Vigoro's general fertilizer in Mid-May. No pesticides.

Also, I did forget to mention that we have very sandy soil.

How come you recommend not using Alfalfa or SBM in the summer? What should we do about the yellowing lawn over the summer?

Thanks again.

Rick

Does it have a spongy feel when you walk on it?

Alfalfa or Milorganite would be the only ferts you should choose over summer. Apply @ 1/2 strength in summer. I wouldn't fertilize again, your mid-May fert will be enough to last through summer. SBM in summer is going to force too much top growth, which you do not want in summer.

To help with yellowing I would recommend spraying Molasses @ 4oz per gal to cover 1000sqft over the summer. You could do this 2x a month on sandy soil. Or use seaweed, or both