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A practical guide to food in the garden and market
Making Compost
Filed under: In The Garden, Tagged as: compost
The combination of dead vegetation with air and moisture will result in compost. Composting is natural decomposition. Composting can take place in a simple free-standing heap of garden waste or a homemade wire-mesh container or a commercially made bin.
Here are the basics you'll need to know to start composting at home:
• Site the compost bin or pile near the vegetable garden and kitchen close to where the finished compost will be used or locate the pile in an area of garden where you will plant next year
• Choose a site in full sun or light shade sheltered from the wind.
• Place the compost bin or pile on bare soil so that excess water can drain away. Till or dig the soil underneath before you begin to fill the area. This will assist drainage and allow macroorganisms such as worms to enter the pile.
• Place the bin or pile with ample air circulation on all sides.
• A compost bin can be square or round. It can be made out of lumber, chicken wire, hardware cloth, concrete blocks, or bales of hay. You can use a wooden box leaving space between the side boards. (Do not use pressure-treated wood or wood treated with toxic preservatives.) You can use four wood frames covered with chicken wire and latched together to form a cube. You can use galvanized metal mesh or welded wire shaped as a cylinder and staked in place. You can use bricks omitting a few bricks on each side for aeration. You can use a steel drum with hundreds of large holes punched in the side so that the external surface is about half and half holes to solid matter.
• If you make one side of the bin removable you will have easier access to the refuse material you are composting. Leave as much open air space to the outside as solid material used to enclose the compost pile. Line the bin with ¼- to ½-inch mesh or hardware cloth if you are worried about compost falling out.
• Use a commercial wood, wire, or plastic bin for aesthetic reasons. Commercial bins are not likely to speed the composting process but they look good. Most commercial bins are specially designed to allow compost to be extracted from the bottom of the bin without disturbing the rotting compost at the top. If you choose a rotating or tumbling bin, be sure it is easy to turn when full; wet compost is very heavy.
• You can use a double or triple bin system: one bin to hold new refuse, a second bin to hold partially decomposed material, and a third to hold finished compost. In this system, composting material is forked from one bin to the next as composting progresses.
• If you do not use a transfer system, you can turn a single pile or bin with a garden fork. Fork the material on the outside of the pile to the inside and the inside material to the outside to speed up composting. (The real composting takes place at the center of the pile.)
• A free-standing compost pile is just as effective as a bin. Situate the free-standing pile on level, well-draining soil or compost in a trench or pit in the garden. Gently slope the pile upwards as you add material.
• A compost bin or free-standing pile should be at minimum 3 feet in each dimension; 4 feet in each dimension is better, and 5 feet in each dimension is best. Composting is accomplished most quickly when the pile runs "hot," when the ingredients of the pile, moisture, air, and the microorganisms in the pile combine to heat the interior of the pile to 130°F or more. (The heat is generated by the work of the living microorganisms. Large piles heat more quickly; this is called "hot" composting.) A smaller, cooler or "cold" compost pile will still produce finished compost, but the process takes more time.
• Start the pile with a fibrous material on the bottom: shredded leaves, straw, hay, corn husks or the like. On top of the first layer place an inch or two of garden soil or cow or horse manure. Then begin adding a second layer of compostable organic material; almost anything that was once alive can be composted. From the kitchen you can compost carrot and other vegetables shavings, fruit peels, citrus pulp and rinds, cooked and uncooked vegetables, corn cobs, stale bread, egg shells, coffee grounds, tea bags, and shredded newspaper. From the garden you can compost fresh and dried leaves, prunings and hedge trimmings, weeds without seeds, nutshells, grass clippings, dead plants, sawdust, wood chips, and cow and horse manure.
• Almost anything organic except animal remains can be composted. Do not compost high protein items such as meat, poultry, fish, grease and fat, dairy products or dog or cat litter. These will attract scavengers--mice and vermin, dogs, cats, and raccoons. (If animals get into the compost pile, enclose it with fine mesh fencing.) And don't compost diseased or insect-infested plants, weeds that have gone to seed, poisonous plants, toxic chemicals, or chemical fertilizers.
• Add to the pile a layer at a time; add 9 to 12 inches of waste and top each layer with 2 inches of soil or fresh manure (these contain more microorganisms). Tamp down each layer and give it a light soaking before adding the next layer. Repeat these layers until the bin is full--to about 4 or 5 feet high. Layering mixes different types of refuse and allows air to circulate through the compost.
• The ideal compost pile will contain both brown and yellow dry, coarse refuse such as dried leaves, straw, and small wood chips and green refuse such as grass clipping, fresh leaves, and kitchen scraps. Brown carbon-rich refuse supplies energy to decomposers working in the pile--mostly microorganisms such as bacteria, fungi, and yeasts and macroorganisms such as worms and insects. Green nitrogen-rich refuse provides protein to decomposers which allows them to grow and divide. Roughly equal parts browns and greens will speed composting.
• Keep the pile moist but not wet; this will aid decomposition. Moisten the pile with water every 2 weeks making sure it does not go dry. Make the top of the compost pile slightly concave so that water can penetrate.
• After several weeks, the pile will have shrunk to one-third its original size. After this turn the pile every 6 weeks to that the rotted material on the inside will be on the outside and the material on the outside will be inside where it can decompose more quickly. Turning the pile moves material on the outside to the hot center. If you use two compost bins, transfer the contents to a second bin mixing the contents thoroughly. (Turning a compost pile is not required but unturned materials can take a year or more to decompose.)
• Cover the bin with a tarp or plastic lid so that rain does not soak the pile and slow composting. (The pile should be moist not wet.)
• Materials are added to the top of the bin or pile and compost is removed from the bottom. Air should be able to penetrate the bin to allow microorganisms such as bacteria and fungi to thrive and help accomplish the composting.
• Compost is ready to use when the starting materials have decomposed beyond recognition and become deep brown or black colored and crumbly textured. This process can take 3 to 6 months; quicker in warm weather, slower in cool weather.
• Finished compost is good for the garden; it both builds and feeds the soil. Spread your compost as a garden mulch topdressing 2 ½ gallons of compost to each square yard of garden.
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