 I also like the science of organics. Organics are complicated. So I'm trying to simplify this for my gardeners that garden in my zone, this Central Highlands area of Arizona. They come in and I sell truckloads of organic fertilizer. The original was a 7-4-4 all-purpose plant food. It's cottonseed meal, bird guano, some iron, sulfur, and it's all granulized so that when you spread it, it goes right to the rock. You don't have to work it in.