Go to the drug store and get some stool softener capsules. Colace is one brand name. It contains Docusate Sodium, which is the ingredient in all crop bound capsules sold by poultry supply outfits. Withhold feed for 24 hours and provide vitamin-electrolyte-probiotic powder treated water. Keep any shavings or small particles that may be eaten out of the environment where you house the bird. The day you withhold feed, give two Colace capsules and make the bird drink after swallowing them. Check the crop the next morning to see if it has emptied. After a day without feed, you can give some moistened feed or some bread soaked in buttermilk. Give a few small portions throughout the day, then check the crop the next morning.
If that doesn't remedy the problem, there could be problems with the gizzard or intestinal tract. Worms, protozoa, bacterial infections in the intestines can all cause enteritis, which can cause the crop not to empty efficiently.
