Definition of "fertileness"

... and he, according to the fertileness of the Italian wit, did not only afford us the demonstration of his practice, but sought to enrich our minds.

c. 1583, Sir Philip Sidney, “An Apologie for Poetrie”, in A Defence of Poesie and Poems

This valley is eighty-seven miles long. It did not have the fertileness of Brown's Park.

1915, E. L. Kolb, chapter 7, in Through the Grand Canyon from Wyoming to Mexico

The fertileness of Place du Bois, "rich in its exhaustless powers of reproduction," reflects a golden age of easy life.

2001, Maureen Anderson, “Unraveling the Southern Pastoral Tradition”, in Southern Literary Journal, volume 34, number 1, page 4