chicken poo

hello unfortunately my chickens are in a fixed pen I try (weather permitting)  to rake the pen ones a week and clear as much as possible but is there any thing i can put down to rejuvenate the ground and kill any nasties  many thanks

Lime will help kill worms and bacteria but you need to remove the birds for a while.

Stalosan F is a disinfectant powder which may help keeping the ground sanitary. 

A woodchip litter which can be renewed periodically would be better than earth.

HF