Healthy Garden Soil
In the soft, warm bosom of a decaying compost heap, a transformation from life to death and back again is taking place. Life is leaving the living plants of yesterday, but in their death these leaves and stalks pass on their vitality to the coming generations of future seasons. Here in the dank, moldy pile the wheel of life is turning.
Compost is more than a fertilizer or a healing agent for the soil's wounds. It is a symbol of continuing life. Nature herself made compost before man first walked the earth and before the first dinosaur lifted its head above the primeval swamp. Leaves falling to the forest floor and slowing moldering are composting. The dead grass of the meadow seared by winter's frost is being composted by the dampness of the earth beneath. Birds, insects and animals contribute their bodies to this vast and continuing soil rebuilding program of nature.
The compost heap in your garden is an intensified version of this process of death and rebuilding which is going on almost everywhere in nature. In the course of running a garden, there is always an accumulation of organic waste of different sorts - leaves, grass clippings, weeds, twigs - and since time immemorial gardeners have been accumulating this material in piles, eventually to spread it back on the soil as rich, dark humus.
The Purpose of Composting:
Gardening and farming disrupt the natural pattern of the return of plant matter to the earth. Compost is the link between modern agriculture and nature's own method of building soil fertility.
In addition to returning rotting vegetable material to the soil, there are two major reasons for making compost:
- to render certain materials such as manure and garbage pleasant to handle
- to increase the nitrogen content of low-nitrogen materials such as sawdust, straw and corncobs
The high heat of composting rapidly "cooks" the smell out of manure and garden waste. This is a significant gain because gardeners are often reluctant to use those materials "fresh".
The composting process also increases the nitrogen content of the pile. Microorganisms "burn off" much of the carbon, reducing the cubic bulk of the heap but correspondingly increasing its nitrogen portion.
Organic matter is valuable to the soil only while it is decaying. Even finished compost is actually only partly decayed. It continues to break down in the soil, providing food for increasing populations of microorganisms upon which your plant health depends. Pound per pound (kg per kg) compost is the finest soil conditioner to be had.
How To Make Compost
Making compost is not difficult and can be easily done at home. Essentially, the basic methods call for layering natural ingredients in heaps in mixed proportions, providing necessary air and moisture and turning the heaps to provide bacterial action on all parts of the heap.
Just about any organic matter can be used. Weeds, fruit and vegetable peelings, grass, garden clippings, dead flowers, sawdust, woodchips, coffee wastes, nutshells, shredded leaves, and more can all be used provided they are chemical, pesticide and herbicide free. Also, do not use feces, or dead animals. In short, think to yourself, "Do I really want to eat this?"
Compost can be made either in open piles or in bins. Piles are more easily turned, but bins have a better appearance in the garden. Bins also have the advantage of better moisture and temperature control. Personally, I have found beginning with a pit in the garden seems to work best, as it attracts earthworms to help with the breakdown of the materials, plus you can turn it easily.
- Whichever method you choose, select a sunny spot and begin by putting down a 6 inch layer of plant wastes such as spoiled hay, straw, sawdust, plant leaves (shredding them first helps) garden clippings, or wood chips
- Add a 2 inch layer of manure and bedding
- Follow with a layer of topsoil, approximately 1/8 inch thick. Unrine-impregnated topsoil is particularly valuable but find out what the animals have been eating as hormones, antibiotics, and chemicals etc, will end up in your soil and then in your food
- On top of this layer of soil spread a sprinkling of lime, phosphate, bone meal, rock, granite dust, or wood ashes to increase the mineral content of the heap. Lime is not added if an acid compost is wanted
- Water the pile, and continue the process of laying. Do not trample on the heap as if it is matted down, aeration will be impeded.
Within a few days the heap will begin to heat up and start to shrink in size. The heap is turned with a pitchfork 2 - 3 weeks after being made, and again at about 5 weeks of age. Care is taken during turning to place the outer parts of the heap on the inside so that they can decay fully.
Do not turn the heap too frequently, as it needs to build up heat for the decaying process. Keep the pile moist, but not wet, and let nature take its course. The compost will be finished after about 3 months.
When To Apply Compost:
The main influence on timing, rate and method of applying compost is its condition, age, and degree to which the composting process is complete. Fully mature compost resembles - indeed, it is - supersoil, a light, rich loam. If half completed so it still retains some fibrous material, it will continue to decompose and generate heat. Such compost should be permitted to finish composting. Never place it near growing plants. However, if you have unfinished compost in the fall of the year, it is safe to apply it. It will finish up in the soil and be ready to supply growth nutrients to the first spring plantings.
The preferred time to apply fully matured compost is a month or so before planting - or, if you are a successive cropper, planting two or more crops to the same parcel of land each session, just before planting. The closer to planting time it goes on, the finer it should be shredded or chopped, and the more thoroughly it should be hoed or tilled into your soil.
If compost is ready in the fall but not intended for use until spring, it should be kept covered and stored in a protected place. If it is kept for a long period of time during the summer, the finished compost should be watered from time to time.
How To Apply Compost:
For general application, the soil should be stirred or turned thoroughly. Then the compost is added to the top four inches of soil. For flower and vegetable gardening, it is best to pan the compost through a 1/2 inch sieve. Course material remaining may then be put into another compost heap.
To avoid disturbing roots of established plants, compost should be mixed with topsoil aand applied as mulch. This is often termed "side dressing". It serves a double purpose, providing plant food that will gradually work itself down to the growing crop, and as a mulch giving protection from extremes of temperature, hard rains and growth of weeds.
For best results, compost should be applied liberally, from 1 - 3 inches per year. There is no danger of burning due to overuse, as happens with artificial fertilizers. Apply compost either once or twice a year.
Layered Garden or "Lasagna" Garden
For those of you who are short on garden space, you might want to try one of the two methods pictured on the right. The first picture allows for more intensive gardening (more plants for the area available).
- Begin by digging a pit of the appropriate size
- Line the bottom with wire mesh if rodents are a problem in your area
- The core or bottom of your compost pile garden is made up of twigs, small branches, and other coarse materials
- Next comes twigs, finely shredded branches, sawdust, etc
- On top of this, place garden materials such as weeds, lawn clippings, fruit and vegetable peelings from the kitchen, coffee grounds, shredded leaves. It's best to shred the leaves, as too many leaves placed in whole can pack down and prevent natural aeration and decomposition (it might start to stink)
- Follow with a layer of partially finished compost
- Top with fully finished compost mixed with quality topsoil
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