The geese feed heavily on the stubble in the rice fields. So to start with, give it a large plate of rice and then some grains. Once it starts eating it you should keep on feeding with rice and grains.
I Have An Adult Goose; What Should I Feed It?
If the goose is wild, there is a feed product specifically for wild geese. You can find it through your local feed mill. Our domestic geese are fed corn (medium chops) and all the grass they want.
I give sweet feed and hay. How much sweet feed should an adult goose eat? I feed twice a day but the wild critters get some so it's hard for me to know. The geese are pets.
We feed our geese sweet feed and cracked corn and let them forage on the grasses. A treat to them is dry cat food so we give them a handful of it daily. We have had our geese for 5 years now and they have done very well on that. Hope you find a good home for your goose.