big-farm-addiction.wikia.com/wiki/Missions
には
How many reputation points and certificates you get depends on a variety of things:
your rank in this mission
your final score by the end of the mission (the amount of goods you harvested)
if the "next mission bonus" is active (only applies to reputation points)
と書かれてますが、貰えるCertificateの枚数も収穫量と"next mission bonus"の有無が関係するのでしょうか?