Berkley Method of Composting in 18 Days

I watched Geoff Lawton's instructions on a basic composting system.  This post summarizes the method Geoff described, which was a modified Berkley method.

First, your goal is to obtain a carbon:nitrogen ratio of between 25 to 30 parts carbon to one part nitrogen. The ingredients of your compost pile vary in richness of nitrogen.  A detailed table is at the link in this sentence.

Your pile ought to be at least 1 M cubed (about five feet).  Do not exceed 1.5M or you may compress the bottom of the pile and encourage anaerobic compost organisms.  Make the pile longer instead of higher.

Cover the pile to keep rain out of it.  You do not want to put the tarp or cover directly on the hot compost or you will encourage anaerobic organisms where the tarp touches the pile. Put branches or something on top to lift the tarp off the top of the pile.

The ingredient mix to achieve the right C:N ratio is approximately 1/3 high carbon (wood shavings, etc.), 1/3 green material, and 1/3 high nitrogen.  These ingredients are thoroughly mixed together.

Mix this together into a pile.  Use a long handled, three to five pronged pitchfork to manage the pile.  Use a rake to smooth it out.

At the beginning, you may use an activator in the middle of the pile.  That could be a dead animal, dead fish, chopped up comfrey or plant with lots of mineral content, or old good compost.  You do not need the activator, but it will help to speed up the process.

At day 4, turn the pile over.  Turn it again every other day thereafter until day 18.

All along you need to keep the moisture content approximately correct.  Geoff recommends a squeeze test.  You grab a big handful of compost and squeeze it tightly in your hands.  If you can get a single droplet to fall out, then it is the right moisture level.  If you can almost get a drop, it is ok.  If it dribbles a lot of drops, it is too moist.

Also, you must periodically test the temperature.  Unless you have a thermometer, you can do this by sticking your arm into the pile.  The temperature should be between 50 - 70 degrees C, but try to keep the temperature between 55-65 degreesC.

At day six, you need to test the compost.  If it is not hot enough, then something is wrong.  Here are the questions:

1. Is it big enough?
2. Is it too wet/dry?
3. Is the mixture right?

You test the heat by sticking your arm into the pile toward the middle.  At 50 degrees C the pile will be uncomfortably hot.  70 degrees will burn and you will be unable to get you arm into the pile.  This is good. The temperature means that the compost is working hard.

If the pile gets too hot, then you will see a white powder developing on the pile.  That is a sign of anaerobic activity.  You need to cool it down some.

If something has gone wrong, you will need to add days lost until the compost is finished.

In the end, hopefully at day 18, smell the compost. It should be earthy smelling and not noxious.  It should be fine. It should be dark brown.  This material is full of beneficial soil life.  You may use it to make compost tea.

Different plants like different flavors of compost.  Trees like fungal rich compost.  Vegitables like bacterial rich compost.  You can mix into the compost different elements to encourage these preferences within a pile after it is done.

Geoff says flour makes a great addition to encourage fungal growth.  Mix into the pile three kilos of flour.  The fungal net will grow rapidly over ten days and then you have compost that is great for planting trees.