fertile vs productive

fertile and productive both are adjectives.

Word	Noun	Adjective	Verb	Adverb
fertile	No	Yes	No	No
productive	No	Yes	No	No

As adjectives, fertile and productive are synonyms defined as:

Other synonyms of fertile include fat, rich.

fertile (adjective)	productive (adjective)
capable of reproducing	producing or capable of producing (especially abundantly)
marked by great fruitfulness	having the ability to produce or originate
bearing in abundance especially offspring	marked by great fruitfulness
intellectually productive	yielding positive results