The student had graduated with high honors from a leading agricultural college and had bought a chicken farm.
After getting settled in, he decided to get busy at the task of raising chickens. He chose ten of the best looking hens on his farm and buried them in a neat row with just their heads sticking out of the ground. The next morning he came out to find them all dead.
Not deterred, he chose ten more chickens and buried them in another neat row with just their feet sticking out of the ground. The following morning, he found them all dead.
Puzzled, he sent an e-mail to his favorite priofessor at the college asking for advice. He received an e-mail back with just three words, "Send soil sample."