Nothing about Frederick Wiseman is more astonishing than his prolificacy.
From the post-gazette.com
Australia was made to pay for its prolificacy when England received its penalty try in the 36th.
From the nzherald.co.nz
Prolificacy is a mere slip of the tongue away from prolixity.
From the telegraph.co.uk
For the index of scientific prolificacy, see H-index.
From the en.wikipedia.org
He is, and has always been, incredibly prolific and that prolificacy is, and always has been, exercised in the direction of forwarding a POV.
From the en.wikipedia.org
More examples
Richness: the property of producing abundantly and sustaining vigorous and luxuriant growth; "he praised the richness of the soil"; "weeds lovely in their rankness"
Great fertility; Producing of a large number of literary or artistic works
The number of offspring actually produced by a female.