How To Make A Complete Organic Fertilizer
How To Make A Complete Organic Fertilizer
How To Make A Complete Organic Fertilizer
Seed meal
This component provides nitrogen, with smaller amounts of phosphorus and potassium. I like to use
cottonseed meal, which is cheap (~$13US for a 40 pound bag) and easily available. In some states,
though, it is not allowed in a certified organic operation (not something a home grower needs to be
concerned about). Other options are alfalfa meal, or rape/canola meal. Cottonseed meal has a NPK value
of around 6-2-1.
In spring I like to substitute blood meal in place of some seed meal, since blood meal is somewhat faster
acting. Try using three parts seed meal and one part blood meal.
Lime
Seed meals tend to be acidic, so lime is included to balance that out. Dolomite limestone is roughly half
Magnesium Carbonate and half Calcium Carbonate. Calcitic limestone is pure Calcium Carbonate. Plants
usually need more calcium than magnesium; so, if you want to be really tricky, use 1/3 part dolomite lime
and 2/3 part calcitic lime.
If your soil is alkaline, you might experiment with reducing or eliminating the lime in this mix.
3-0) is that it continues to contribute phosphorus to your soil over many years.
I like to use bone meal. Not only is it easier to find, but also it is already being produced as a byproduct of
the beef industry. Rock phosphate is mined. Twenty pounds of bone meal will run about $5US.
Kelp Meal
Kelp meal (NPK ~ 0-0-10) contributes potassium, and also many micronutrients. This tends to be more
expensive than the other components: I recently paid $35US for a 50 pound bag.
Another possible potassium source is Jersey Greensand. It has the same advantages and liabilities as rock
phosphate (it's very slow release). In addition, it does not supply micronutrients.
If you want to make your own organic fertilizer combination, use the following
ingredients (all of which you should be able to buy in bulk at a farm supply or feed
store; they'll keep for years if kept dry):
4 parts seed meal
1 part dolomite lime
1/2 part bone meal or 1 part soft rock phosphate
1/2 part kelp meal
Grab the four corners of the cheesecloth and bring them together, then twist and
apply rubber band to make your "tea bag" of fertilizer.
Place the tea bag in the bucket, and fill with water and let it steep for a day or so.
When the tea is ready, remove the bag, and fill the bucket the rest of the way with
clear water to dilute the tea. You can treat each of your plants to a cup or two of
tea.
As a rule, underfeeding is better than overfeeding, and small regular feedings are
better than occasional large ones.
http://www.sierraclub.org/e-files/fertilizer.asp
Compost Materials
Almost any organic material is suitable for a compost pile. The pile needs a proper ratio of carbon-rich
materials, or "browns," and nitrogen-rich materials, or "greens." Among the brown materials are dried
leaves, straw, and wood chips. Nitrogen materials are fresh or green, such as grass clippings and kitchen
scraps.
Mixing certain types of materials or changing the proportions can make a difference in the rate of
decomposition. Achieving the best mix is more an art gained through experience than an exact science.
The ideal ratio approaches 25 parts browns to 1 part greens. Judge the amounts roughly equal by weight.
Too much carbon will cause the pile to break down too slowly, while too much nitrogen can cause odor.
The carbon provides energy for the microbes, and the nitrogen provides protein.
Leaves represent a large percentage of total yard waste. If you can grind them in a gas or electric chipper
shredder or mow over them, they will reduce in size making them easier to store until you can use them in
the pile, and they will decompose faster - an issue with larger leaves. They are loaded with minerals
brought up from the tree roots and are a natural source of carbon. A few leaf species such as live oak,
southern magnolia, and holly trees are too tough and leathery for easy composting. Avoid all parts of the
black walnut tree as they contain a plant poison that survives composting. Eucalyptus leaves can be toxic
to other plants. And avoid using poison oak, poison ivy, and sumac.
Pine Needles need to be chopped or shredded, as they decompose slowly. They are covered with a thick,
waxy coating. In very large quantities, they can acidify your compost, which would be a good thing if you
have alkaline soils.
Grass Clippings break down quickly and contain as much nitrogen as manure. Since fresh grass
clippings will clump together, become anerobic, and start to smell, mix them with plenty of brown
material. If you have a lot of grass clippings to compost, spread them on the driveway or other surface to
bake in the sun for at least a day. Once it begins to turn pale or straw-like, it can be used without danger of
souring. Avoid grass clippings that contain pesticide or herbicide residue, unless a steady rain has washed
the residue from the grass blades.
Kitchen Refuse includes melon rinds, carrot peelings, tea bags, apple cores, banana peels - almost
everything that cycles through your kitchen. The average household produces more than 200 pounds of
kitchen waste every year. You can successfully compost all forms of kitchen waste. However, meat, meat
products, dairy products, and high-fat foods like salad dressings and peanut butter, can present problems.
Meat scraps and the rest will decompose eventually, but will smell bad and attract pests. Egg shells are a
wonderful addition, but decompose slowly, so should be crushed. All additions to the compost pile will
decompose more quickly if they are chopped up some before adding.
To collect your kitchen waste, you can keep a small compost pail in the kitchen to bring to the pile every
few days. Keep a lid on the container to discourage insects. When you add kitchen scraps to the compost
pile, cover them with about 8" of brown material to reduce visits by flies or critters.
Wood Ashes from a wood burning stove or fireplace can be added to the compost pile. Ashes are alkaline,
so add no more than 2 gallon-sized buckets-full to a pile with 3'x3'x3' dimensions. They are especially
high in potassium. Don't use coal ashes, as they usually contain large amounts of sulfur and iron that can
injure your plants. Used charcoal briquettes don't decay much at all, so it's best not to use them.
Garden Refuse should make the trip to the pile. All of the spent plants, thinned seedlings, and
deadheaded flowers can be included. Most weeds and weed seeds are killed when the pile reaches an
internal temperature above 130 degrees, but some may survive. To avoid problems don't compost weeds
with persistent root systems, and weeds that are going to seed.
Spoiled Hay or Straw makes an excellent carbon base for a compost pile, especially in a place where few
leaves are available. Hay contains more nitrogen than straw. They may contain weed seeds, so the pile
must have a high interior temperature. The straw's little tubes will also keep the pile breathing.
Manure is one of the finest materials you can add to any compost pile. It contains large amounts of both
nitrogen and beneficial microbes. Manure for composting can come from bats, sheep, ducks, pigs, goats,
cows, pigeons, and any other vegetarian animal. As a rule of thumb, you should avoid manure from
carnivores, as it can contain dangerous pathogens. Most manures are considered "hot" when fresh,
meaning it is so rich in nutrients that it can burn the tender roots of young plants or overheat a compost
pile, killing off earthworms and friendly bacteria. If left to age a little, however, these materials are fine to
use.
Manure is easier to transport and safer to use if it is rotted, aged, or composted before it's used. Layer
manure with carbon-rich brown materials such as straw or leaves to keep your pile in balance.
Seaweed is an excellent source of nutrient-rich composting material. Use the hose to wash off the salt
before sending it to the compost pile.
The list of organic materials which can be added to the compost pile is long. There are industrial and
commercial waste products you may have access to in abundance. The following is a partial list:
corncobs, cotton waste, restaurant or farmer's market scraps, grapevine waste, sawdust, greensand, hair,
hoof and horn meal, hops, peanut shells, paper and cardboard, rock dust, sawdust, feathers, cottonseed
meal, blood meal, bone meal, citrus wastes, coffee, alfalfa, and ground seashells.
Carbon/
Nitrogen
Details
Algae, seaweed
and lake moss
Yes
No
n/a
Ashes from
untreated,
unpainted wood
Careful
Neutral
Beverages,
Yes
Neutral
kitchen rinse
water
Cat droppings or
No
cat litter
n/a
Coffee ground
and filters
Yes
Compost
activator
Not
required,
but ok.
Neutral
Cornstalks, corn
cobs
Yes
Bird droppings
Cardboard
Careful
Yes
Diseased plants
Careful
Dog droppings
No
n/a
Avoid.
Dryer lint
Yes
Eggshells
Yes
Fish scraps
No
n/a
Hair
Yes
Lime
No
n/a
Manure (horse,
cow, pig, sheep,
goat, chicken,
rabbit)
Yes
n/a
Avoid.
Milk, cheese,
yogurt
Careful
Neutral
Newspaper
Yes
Sawdust and
wood shavings
Yes
(untreated wood)
Weeds
Careful
Sod
Careful
Oak leaves
Yes
can help trap solar radiation during cold spells. Keep the pile as large as possible so that heat generated
from decomposition will endure. You can also stack bales of straw along the sides of your bin to help
retain the heat.
In areas with a cold winter, spring is the best time to start the compost pile in earnest. There's an
abundance of grass clippings and trimmings. Summer is the time the compost pile is working at its peak
range of decomposition, especially if it has been turned once or twice. Cover and store the finished
compost, or use it, and start another batch. With enough organic waste, you can produce several batches
of highly managed compost during the summer.
Making Compost
Compost can range from passive - allowing the materials to sit and rot on their own - to highly managed.
Whenever you intervene in the process, you're managing the compost. How you compost is determined by
your goal. If you're eager to produce as much compost as possible to use regularly in your garden, you
may opt for a more hands-on method of composting. If your goal is to dispose of yard waste, a passive
method is your answer.
Passive composting involves the least amount of time and energy on your part. This is done by collecting
organic materials in a freestanding pile. It might take a long time (a year or two), but eventually organic
materials in any type of a pile will break down into finished compost. More attractive than a big pile of
materials sitting in your yard is a 3-sided enclosure made of fencing, wire, or concrete blocks, which
keeps the pile neater and less unsightly. Add grass clippings, leaves, and kitchen scraps (always cover
these with 8" of other material). The pile will shrink quickly as the materials compress and decompose.
Wait a year or two before checking the bottom of the bin for finished compost. When it's ready, shovel the
bottom section into a wheelbarrow and add it to your garden beds. Continue to add greens and browns to
have a good supply of finished compost at the ready. After the first few years, most simple piles produce a
few cubic feet of finished compost yearly.
Managed composting involves active participation, ranging from turning the pile occasionally to a major
commitment of time and energy. If you use all the techniques of managing the pile, you can get finished
compost in 3-4 weeks. Choose the techniques that reflect how much you want to intervene in the
decomposition process and that will be a function of how fast you want to produce compost.
The speed with which you produce finished compost will be determined by how you collect materials,
whether you chop them up, how you mix them together, and so on. Achieving a good balance of carbon
and nitrogen is easier if you build the pile all at once. Layering is traditional, but mixing the materials
works as well.
Shredded organic materials heat up rapidly, decompose quickly, and produce a uniform compost. The
decomposition rate increases with the size of the composting materials. If you want the pile to decay
faster, chop up large fibrous materials.
You can add new materials on an ongoing basis to an already established pile. Most single-bin gardeners
build an initial pile and add more ingredients on top as they become available.
The temperature of the managed pile is important - it indicates the activity of the decomposition process.
The easiest way to track the temperature inside the pile is by feeling it. If it is warm or hot, everything is
fine. If it is the same temperature as the outside air, the microbial activity has slowed down and you need
to add more nitrogen (green) materials such as grass clippings, kitchen waste, or manure.
Use a compost thermometer to easily see how well your compost is doing. They are inexpensive, and
quite convenient to have.
If the pile becomes too dry, the decay process will slow down. Organic waste needs water to decompose.
The rule of thumb is to keep the pile as moist as a wrung-out sponge.
If you're building your pile with very wet materials, mix them with dry materials as you build. If all the
material is very dry, soak it with a hose as you build. Whenever you turn the pile, check it for moisture
and add water as necessary.
Too much water is just as detrimental as the lack of water. In an overly wet pile, water replaces the air,
creating an anaerobic environment, slowing decomposition.
Air circulation is an important element in a compost pile. Most of the organisms that decompose organic
matter are aerobic - they need air to survive. There are several ways to keep your pile breathing. Try not to
use materials that are easily compacted such as ashes or sawdust, without mixing them with a coarser
material first. People who build large piles often add tree branches or even ventilation tubes vertically into
different parts of the pile, to be shaken occasionally, to maximize air circulation.
A more labor-intensive way to re-oxygenate the pile is to turn the pile by hand, using a large garden fork.
The simplest way is to move the material from the pile and restack it alongside. A multiple-bin system
makes this efficient, in that you only handle the material once. Otherwise, you can put the material back
into the same pile. The object is to end up with the material that was on the outside of the original pile,
resting in the middle of the restacked pile. This procedure aerates the pile and will promote uniform
decomposition.
temperature is below 104 degrees F or above 131 degrees F. This keeps the pile operating at its peak.
Most disease pathogens die when exposed to 131 degrees for 10-15 minutes, though some weed seeds are
killed only when they're heated to between 140 degrees and 150 degrees. If weed seeds are a problem, let
the pile reach 150 degrees during the first heating period, then drop back down to the original temperature
range. Maintaining temperatures above 131 degrees can kill the decomposing microbes.
Click on photos to get more information and pricing about each compost bin, or visit our online Compost
Bin Store.
To save space, hasten decomposition, and keep the yard looking neat, contain the compost in some sort of
structure. A wide variety of composting structures can be purchased, or made from a variety of materials.
They can be as simple or complex as desired.
Yard wastes can be composted either in simple holding units, where they will sit undisturbed for slow
decomposition, or in tumbling compost bins, which produce finished compost as quickly as just a few
weeks with a good mix of materials.
Holding units are simple containers used to store garden waste in an organized way until these materials
break down. A holding unit is the easiest way to compost. It only requires placing wastes into a pile or bin
as they are generated. Non-woody materials such as grass clippings, crop wastes, garden weeds, and
leaves work best in these systems. A holding unit can be a cylinder formed of wire (chicken wire is too
weak to hold up to the bulk), or wood scraps. Openings in the sides need to be large enough to permit
plenty of air, but small enough to contain the materials that are composting.
Turning units are typically a series of bins used for building and turning active compost piles. A turning
unit allows wastes to be conveniently mixed for aeration on a regular basis.
Read about why I like compost tumblers.
Browse garden tools, electric tillers, reel mowers, compost tumblers at Clean Air Gardening.
Home gardeners are constantly inventing creative and inexpensive ways to hold their compost - for
example, bins made from wire mesh or from shipping pallets.
Some gardeners lash together four pallets, leaving one corner loosely attached to act as a door. Others
install posts in four corners, nail the pallets to the posts to form three sides of the bin, and wire the last
pallet with some slack to allow access.
Make a simple, three-sided bin by stacking concrete or cinder blocks. Leave the fourth side open for
turning the pile or for access to the finished compost.
Renewed interest in recycling has prompted a great increase in the types of composting systems available
commercially. Consider the advantages and disadvantages of each type of compost bin to choose the best
one for your yard, budget, and life-style. They range from wire containers to plastic bins and tumblers.
Composters are available online from CleanAirGardening.com and from our online composter store.
Learn about making compost tea on this page.
Troubleshooting
Making compost is really quite easy, but having too much of a certain material or letting the compost get
too wet or too dry can cause problems.
Possible Causes
Solution
1. Not enough
nitrogen
2. Not enough
Nothing is
oxygen
happening.Pile
3. Not enough
doesn't seem to be
moisture
heating up at all.
4. Cold weather?
5. Compost is
finished.
Matted leaves or
grass clippings
aren't
decomposing.
Odor like
ammonia.
Attracts rodents,
flies, or other
animals.
Inappropriate
materials (like meat,
oil, bones), or the
food-like material is
too close to the
surface of the pile.
Attracts insects,
millipedes, slugs,
etc.
This is normal
composting, and part
Not a problem.
of the natural
process.
You can learn more about vermicomposting on our worm composting page.
Using Compost
Finished compost is dark brown, crumbly, and is earthy-smelling. Small pieces of leaves or other
ingredients may be visible. If the compost contains many materials which are not broken down, it is only
partly decomposed. This product can be used as a mulch, but adding partly decomposed compost to the
soil can reduce the amount of nitrogen available to the plants. The microorganisms will continue to do the
work of decomposing, but will use soil nitrogen for their own growth, restricting the nitrogen's
availability to plants growing nearby.
Allow partly decomposed compost particles to break down further or separate them out before using
compost on growing plants. Or add extra nitrogen such as manure, to ensure that growing plants will not
suffer from a nitrogen deficiency. Compost is great for flower gardening, herb gardening, organic lawn
care and vegetable gardening.
Compost serves primarily as a soil conditioner, whether it's spread in a layer on the soil surface or is dug
in. A garden soil regularly amended with compost is better able to hold air and water, drains more
efficiently, and contains a nutrient reserve that plants can draw on. The amended soil also tends to produce
plants with fewer insect and disease problems. The compost encourages a larger population of beneficial
soil microorganisms, which control harmful microorganisms. It also fosters healthy plant growth, and
healthy plants are better able to resist pests.
One inch thick is enough to spread on your garden beds. Compost continues to decompose, so eventually
the percentage of organic matter in the soil begins to decline. In northern climates, compost is mostly
decomposed after two years in the soil. In southern climates, it disappears even faster and should be
replenished every year.
To bolster poor soil with little organic matter, spread 2 to 3 inches of compost over a newly dug surface.
Then work the compost into the top 6 inches of earth.
A garden soil that has been well mulched and amended periodically requires only about a inch layer of
compost yearly to maintain its quality.
Some people recommend late fall as a good time to spread compost over a garden bed, and cover it with a
winter mulch, such as chopped leaves. By spring, soil organisms will have worked the compost into the
soil. Others recommend spreading compost two weeks before planting time in the spring. There is really
no wrong time to spread it. The benefits remain the same.
If your supply of compost is really limited, consider side-dressing, a way to use compost sparingly by
strategically placing it around certain plants or along certain rows. This is best done in late spring and
early summer so that the rapidly growing plants can derive the maximum benefit from the compost.
To side-dress a plant, work the compost into the soil around the plant, starting about an inch from the
stem, out to the drip line, taking care not to disturb the roots. For shallow rooted plants, leave the compost
on the soil surface. A 2" layer works best when left on top.
For new lawns, a 2 to 3" layer of compost is best when planting. Once the new lawn is established, a to
" layer yearly will maintain the quality of the soil.
An existing lawn top-dressed with a " layer of compost every year or two will be healthier than an
unamended lawn. Fall is the best time to apply the compost, although an application in early spring is
almost as effective.
A compost mulch can benefit trees and shrubs just as it does other plants. Spread a " to 1" layer of
compost on the bare soil under the tree as far as the drip line. Then cover with a 2-3" layer of some other
kind of organic mulch, such as chopped leaves or pine needles. The mulch will hold the compost in place
and keep it from drying out.
Adding compost to the planting hole of small perennial plants is valuable, particularly perennial food
plants. Annuals will also benefit from a dose of compost at planting time.
Compost is the ultimate garden fertilizer. It contains virtually all the nutrients a living plant needs and
delivers them in a slow-release manner over a period of years. Compost made with a wide variety of
ingredients will provide an even more nutritious meal to your growing plants.
Compost is the best material available to enliven your soil no matter where you live. Farmers around the
world will testify that healthier soil grows healthier plants that naturally resist disease, insects, and other
environmental pressures. Adding compost to your garden is a long-term investment - it becomes a
permanent part of the soil structure, helping to feed future plantings in years to come.
http://www.compostguide.com/