fertility

(noun) the ratio of live births in an area to the population of that area; expressed per 1000 population per year. Synonyms: birthrate, birth rate, fertility rate, natality.

(noun) the state of being fertile; capable of producing offspring. Synonyms: fecundity.

(noun) the property of producing abundantly and sustaining vigorous and luxuriant growth. Synonyms: richness, rankness, prolificacy. Examples: "He praised the richness of the soil." "Weeds lovely in their rankness."