I'm a home brewer and have been spreading my spent beer grains on my lawn with my fertilizer spreader. I've done this in addition to corn gluten meal, some occasional chicken poop fertilizer, and leaving the lawn clippings on my lawn when I mow. I also mulch my leaves into the lawn in the fall.
I thought this would be a good idea because over time the beer grains compost making good fertilizer over time. However, I've learned it may not be a good idea to spread the beer grain on the lawn because as they decay the microbes eating them use up nitrogen in the soil. Is this true? If it is, should I compost the beer grains before I put them on the lawn? Or will doing this over time create an abundance of nitrogen even if the microbes actively break down the fresh stuff?
Thanks in advance.