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.
44 FERTILIZERS: TYPES, REACTIONS, AND RESPONSES Carolyn DeMoranville UMass Amherst Cranberry Station East Wareham, MA Fertilizer types Fertilizer can be categorized in several ways based on physical and chemical properties. Fertilizers may also be broken up into two broad groups -- soil applied or foliar applied.n addition to untreated granular materials, the soil fertilizer category includes organic fertilizers, liquids, and slow release materials. A primary difference among these materials is the timeline from application until the mineral elements are available for uptake by the roots.