Posted: 16/09/2013 at 11:00
A word of warning re horse manure. Make sure that you know where it comes from and try to talk to other people who have satisfactorily used it.
A couple of years ago people on my allotment site regularly used manure delivered to them from a couple of local riding stables. Subsequently a lot of those people found rows of beans and seedlings were dying off.
Investigation proved without any doubt it was the manure, which had been contaminated by Pyralid herbicides.
Aminopyralid weed killers have been used by Stables to control troublesome perennial weeds, and stables can also use,unknown to them,hay which has been treated with Pyralid herbicides.
Pyralid toxicity can last in the soil for up to 18 months.
The problem came to light about 5 years ago, and for a while amino pyramids were taken off the market, but I believe they are being sold again.
So, don't stop using horse manure, which I think is the best treatment for my allotment soil, but do exercise extreme caution as to sources