Lime, When, how much, for what

[Paulines7]

.... I would try to maintain it as it is by crop rotation, manuring and liming. Lucky you ;D

The only manure it gets is from the chickens as they are part of the crop rotation.  I think I read somewhere that chicken poo contains lime.  Does anyone know if this is true?  

Growmore, I didn't wet the soil as it was already damp so perhaps I should try it again today.  The reason that I didn't add water to the soil yesterday as per the instructions, is that I thought it might give a false reading if I used water from the mains.  I will try again today using water from three different sources, kitchen tap, water butt and pond.

Result same as yesterday....7

[Paulines7]