A percentage is the chance of that extra item. The wiki lists no amount where it shows 1 per pickup. Pickups and plants need no tool. Picture from RustHelp.
← The world
PLANT OR PICKUP
What you get
ITEM AMOUNT OR CHANCE
Wheat 1 per pickup
Wheat Seed 1 per pickup
Worm 10%
Grub 5%
A percentage is the chance of that extra item. The wiki lists no amount where it shows 1 per pickup. Pickups and plants need no tool. Picture from RustHelp.