There are a number of ways to test for the toxicity of a mushroom compost:
Peat - The easiest way to test is to put the compost in water and see if it dissolves. Peat should dissolve quickly, while some other types of compost might take longer. If it doesn't dissolve quickly, then it may be poisonous. If you don't know whether your compost is peat or not, try putting it in water and seeing if it dissolves. If it does, then it is probably peat. The easiest way to test is to put the compost in water and see if it dissolves. Peat should dissolve quickly, while some other types of compost might take longer. If it doesn't dissolve quickly, then it may be poisonous. If you don't know whether your compost is peat or not, try putting it in water and seeing if it dissolves. If it does, then it is probably peat.
A pH test - Some fungi have been found to make your compost more acidic than normal. This can be a problem for plants if they have a hard time acclimating to an acidic soil. Some fungi have been found to make your compost more acidic than normal. This can be a problem for plants if they have a hard time acclimating to an acidic soil.
A soil test - Soil tests are good for checking the general health of your soil, but they are not very helpful when trying to determine whether your compost is toxic or not. Soil tests are good for checking the general health of your soil, but they are not very helpful when trying to determine whether your compost is toxic or not.
Petri dish - The easiest way is to take a sample and put it in a petri dish with a bit of water and some bacteria. Bacteria will eat away at the compost and tell you how poisonous it is.
Testing your compost for toxicity is not necessary if you use a mushroom compost that has been tested and found to be non-toxic.