FoodProduction101

Why Bother Composting?

February 25, 2014 by  
Filed under Blog, Compost/mulch, Soils

Composting can seem pretty complicated. Depending on who you talk to, or what you read, you will find tons of different advice on how to get just the right “brew”. You’ll hear about having the perfect ratio of greens and browns, and putting them together in thin shredded layers. Then you hear about occasionally turning the pile to let the right amount of oxygen in, but not too often, as you are losing nitrogen. Then you have to have the right cooking temperature. You have to have it hot, but not too hot. Hot enough to cook, but not so hot that you burn up your nutrients. Then you have leaching to worry about, and rodents and other animals if you don’t cover your edible scraps. You have to keep the right moisture levels. Seriously, how practical is all this??????

 

Sometimes I wonder why composting has to be so complicated. First of all, all organic material decomposes, and most of the materials that you are going to put into your compost pile will decompose in one year without any turning or any special attention. Sawdust, tree branches, and paper tend to take much longer. I would suggest making a separate pile for woody material. You can use the woody pile for firewood, or even a hugelkultur bed. If you burn your wood pile, you can use the wood ash in your garden beds, but be careful. Too much wood ash can raise the soil PH beyond what is good for most plants. Definitely, keep wood ash away from acid loving plants like blueberries. Wood ash can add some calcium, potassium, and a small amount of phosphorus.

 

So, if most things will decompose in one year, why do people go to all this trouble to get it just right? People do this to speed up the process, and to get just the right nutrient levels in their compost that is suitable for their plants.    

 

What are the appropriate nutrient levels for compost?

This is a difficult question to answer, because it depends on the existing soil, climate, and types of plants where the compost will be applied. Furthermore, there is much debate in this area as well. This is where we should know about the carbon to nitrogen ratio. Most people advocate around a 25-1 ratio of carbon to nitrogen. Below is a list of approximate carbon to nitrogen ratios of various materials.

 

6:1- These high nitrogen sources are high nitrogen manures such as rabbit, chicken, and pig, as well as bone meals.

12:1- Horse and cow manure, vegetable scraps, weeds, spring grass

25:1- Green hay, fruit, summer time grass

50:1- Dry corn stalks, tree leaves, poor hay

100:1- Tree bark, pine needles

Source carbon-nitrogen ratios “Gardening when it Counts” Steve Solomon

 

How you get to that nice 25:1 ratio compost pile, really depends on what you are putting into it. If you have lots of leaves in your compost pile, you probably want to add rabbit or chicken manure to help bring down the carbon to nitrogen ratio. Also, you will want to mix the materials as they go in, which further complicates things. Unless you are really anal about the ratio, I would imagine most people never get it exactly right. My compost is a mix of chicken manure, grass clipping, and a small amount of leaves. All of my edibles that don’t get eaten go to the chickens.

 

I have tried many different ways of composting to find the most efficient way.

 

1. The two-chamber tumbler that you can easily turn, and put your wheel barrow under to collect the compost. This is a nice idea, but the latches on the doors are not durable enough. The tumbler is off the ground which is good for rodents, but bad for earth worms, and soil microbes. It is also a pain to lift heavy material up to put into the chambers.

Cost: High (I think this tumbler was in the $300-350 dollar range)

Labor: Medium (It’s easy to take out material, but it is hard to put it in)

Speed of compost: Fast (You can turn the material easily)

 

2. The standard two pile system where you add to one side until it is really full then you add material to the other side, while the first pile cooks. This is OK, but you still have to worry about leaching and rodents, and it’s a pain in the neck to shovel the compost out.   

Cost: Medium (You can make these out of old pallets, but it is still more expensive than just a pile)

Labor: High (What a pain to shovel in and out)

Speed of compost: Slow (Most people will not take time to turn the pile, what a pain)

 

3. The pile system is good if you have a tractor or front end loader. If not, you can use a fork. I've found that if the pile is too small, it doesn't heat up enough. If the pile is about 4 feet tall, then things seem to cook well, but I don't have any science to back that up, just observation. 

Cost: Low (I put low cost here, because it is taking up land space, which isn’t free)

Labor: High (Human labor can be low, if you have a tractor, but you are still using all the embodied energy in the diesel fuel)

Speed of compost: Medium (A bigger pile seems to compost a little quicker than a smaller pile)

 

So now that we know how to compost, I can tell you that I hardly compost at all anymore. I love solutions that are easy. We want to get rid of waste, and fertilize and amend our garden soils. Why do we need to put our organic material into a pile to do this? Why can’t we compost in place? Why bother moving it into a pile, only to be moved again later? It seems so inefficient.

 

A lot of permaculturalists and gardeners are going to the Ruth Stoudt method of sheet mulching or composting in place. I’ve been doing this for the past few years, and I really think it is the way to go. For me, I have a lot of grass and weed clippings, chicken manure, and leftover plant leaves and debris. Now I just spread my grass clippings thinly and evenly in my garden beds. I do keep the clippings from away from my plants, as they are hot while they are green. I try to put the clippings in areas where plants have recently finished, or in fallow areas. They do dry out in just a couple of days. When I prune, or when a plant is finished producing, I simply let it decompose in place. If it’s good enough for nature, it’s good enough for me. I put my chicken manure in swale trenches to feed my fruit trees, or in fallow areas of the garden. Chicken manure is hot, so you should keep it away from your plants, until it is composted.

Dried Grass Clippings

So at this point, the only extra step I need to make is to empty the deep litter trays in my chicken coops. This is the easiest way I have found to maintain good soil fertility and deal with any leftover organic materials. Thank you Ruth Stoudt!  

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