[Anke]

Be careful  of the manure hot beds  in the tunnels for the heat also hatches insect eggs that may become insects that decimate your plants.

 You may also find that as the muck decays you'll get far too much condensation then your seedlings/plants will suffer damping off.

If there is plenty of ammonia produced it may also affect the plants in an adverse way .

My plants will be in individual pots on top of a plastic sheet (have muck then a thin layer of either sand, and then pots on top). Polytunnel is open at the side vent all the time at the moment.

It will be an experiment and may all go pear-shaped, but I am sure we will work on it in future years....