Temperature and moisture of the heaps should be monitored as often as possible, preferably on a daily basis. This will show when the heaps are ready to be turned and if more water is required.
Each bin or heap should be allocated a number by which it can be identified, and the number attached to the heap. This can be, for example, a small wooden label which can be hung on a nail or hook and moved as the batch is transferred from bin to bin. This will help in keeping track of the process.
Temperature
Technical method -
'Lockable' thermometers are useful here like a 'Prima' digital locking thermometer. This is a probe with a digital display, allowing the temperature to be taken in the middle of the heap and 'locked' before the instrument is removed.).
Non-technical method -
Allow a metal rod to heat up in the middle of the heap. Take it out. If the hot end can be held comfortably in the bare hand for only three seconds the heap is hot enough and does not require turning. Any longer than three seconds and the heap should be turned.
Moisture
Technical method -
Moisture content of the heap can be measured using a moisture meter. These are readily available from horticultural suppliers and garden centres.
Non-technical method -
Take a handful of compost and squeeze. If two or three drops of water are produced moisture content is ideal. Any more it is too wet, any less it is too dry.
How do you know that composting is completely finished?
A simple test, that the Forest of Dean composting group use, is to put a sample in a plastic bag; which they seal and leave for a few days. When opened it should smell pleasantly of compost and not be horribly putrescent
Progress of temperature and moisture levels can be plotted on a graph to show progress of each heap. This is particularly useful in schools where the community composting scheme is used for teaching various aspects of the National Curriculum.
Compost sampling
Technical method -
You can also take samples of your finished compost and send them for analysis. If you do want to, contact the Community Composting Network for advice. They have been negotiating for a members price as the analysis can be costly.
Non-technical -
The proof of the pudding is in the eating! Grow plants in your compost. Put some in a seed tray and see if any weeds germinate. Pot up some plants in it and see how well they grow. So some seeds in it and see how well they perform. Mulch your garden with it, grow your vegetables with it, fill your window boxes and hanging baskets with it. When you are happy with it - then start selling it with confidence!
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