You wont get any definate answers regarding opium yield. It varies. It's alot better than most people think tho. On average a single poppy pod will yeild 80mg. Like I said tho it varies. If you have shit pods and you grow them poorly you can harvest as little as 10mg or nothing at all. 80mg is the average tho.
Genetics plays a huge role in determing what your actual harvest will be. Some strains, like Persian Whites, are known for being extremely high yielding. Others, like Hens and Chicks, are known for producing very potent latex.
The great thing about growing poppies is that it is extremely low maintenance. Start with some good, tilled soil. Sprinkle your seeds ontop of it. Water till they sprout. Then water maybe ounce every two weeks or so. Feed some nutrients ounce a month. Plus you are harvesting an extremely concentrated smokeable opiate. Mmmmmmm....it's very rewarding.
[ 06 January 2002: Message edited by: Effigy ]