water retension experiment
I'm trying an experiment with my old potting soil to try to judge its water retention. The container (pictured) has a metal screen bottom. The container is 16 inches high and I put 8 inches or so of the old potting soil in it, then watered it with one gallon of water using a watering can. The container is sitting in a big tub where I can later observe/collect how much of the water infiltrates down through the soil in a particular amount of time. So far, I've noticed, after measuring, that in one hour just about half the gallon of water poured onto the this soil in this container as described has infiltrated through.