A Cardinal number represents an equivalence class of sets between which there is a bijection (one-to-one correspondence). It is the number of elements in any member of the equivalence class. An Ordinal number represents an equivalence class of well-ordered sets between which there is an order-preserving bijection. It is the number of elements in any member of the equivalence class. The difference is only in whether the sets are ordered.
It is the basis for protein manufacture in plants and plays a major part in photosynthesis. For lawns, shrubs and leafy houseplants, a nitrogen-rich fertilizer is the best choice. When reading a fertilizer package, nitrogen will be the first in a series of numbers appearing with dashes between them. For example, a formula of 10-0-0 is a nitrogen-only fertilizer.
There are many different types of fertilizer. This can range from the inorganic type that is cooked up in a chemical lab to the kind that Mother Nature produces. The key to using Mother Natureâs fertilizer is understanding the concept of manure.hen using these types of fertilizers, first make sure it is well seasoned. Green manure or uncured manure is not recommended. This type of manure is too hot to use and will burn the plants. Green manure needs to be seasoned at least one year before using but not all manures need to be seasoned.