TO SEE HOW THE NEW SYSTEM WORKS, DELETE AND REGEN YOUR "Crop" FOLDER AND INSPECT THE "corn.yml" FILE. YOU'LL SEE THE NEW SETUP EXEMPLIFIED IN DROP GROUPS "1-1" AND "1-2". THE NEW VARIABLE ADDED IS "chance". For the new chance based drop system, include multiple drop configurations for the same percent, but change the "chance" variable in the setup to whatever you please. It doesn't have to equal 100 but it's recommended.
SUGGESTED BY dejakob