A milk crate used to sift compost, and an easy way to make neat holes in cups: Watch
Also known as carbamide.
Quickly converts first into ammonia, and then ammonium (2-3 days).
Micronutrient values may show a zero value for missing data. Over time the dataset will improve, but keep in mind that in some instances; especially with natural materials, the listed values given are rough estimates and will vary with samples from different sources.