Hi Colin,
I haven’t given storage much thought. I get my horse manure delivered by trailer and put it into a homemade compost bin of approx. 1.5cu. mtr. The manure I get is around 1.5/2 yrs old and I store it for around 6 months in the bin covered from the elements. I get it in March and start spreading it as required from September onwards.
Don.
