Manure is an organic amendment. Organic matter improves soil aeration, water infiltration, and both water- and nutrient-holding capacity. Well aged organic matter is an important energy source for bacteria, fungi and earthworms that live in the soil. All your soil needs is 3% organic matter! You can see how adding too much manure can upset your soil balance really quickly. Sometimes soils are ‘poor’ because they are over amped!
Fresh manure is a no, no! Ammonia is not good for your plants. A minimum of 6 months to a year of aging is recommended. Composting manure changes it – ammonia off gasses, there is less Nitrogen, but more phosphorus, potassium, and salts. If salt levels are high in your garden, no adding manures! Home composting simply doesn’t get hot enough to get rid of pathogens. That’s why manures are not recommended for veggie gardens, especially for soil touching root crops like carrots, radishes, and lower lettuce leaves. Yet manures have been used for centuries for growing veggies. But, be warned, ok? Organic farmers follow strict guidelines when using manures. If you have plenty of time, in winter simply till it into the soil and wait for Mama nature to do her work; plant in spring! The exceptions are rabbit or goat, sheep that compost in place quickly. Dig ’em right in.
Manures and grass clippings decompose quickly, days to weeks. Compost takes longer, 6 months, depending on the system you use and how you do it. When applying to your garden, a combination will give immediate and long term improvement. Sheet composting can be speeded up by using THIN layers of chopped green wet materials in combination with straw brown dry layers. Remember, manures and compost are not quick fixes for ailing yellowing plants low in Nitrogen. If you need quick, blood meal and fish emulsions will work faster.
The word on Cow Manures! Hold your nose. They contain methane. What goes in comes out, that could be hormones, chemicals. That’s not organic. It’s less ‘hot’ than chicken manure. Dairy cow manure is more water holding than steer manure. Ask if there is straw or sawdust mixed in. That’s good for composting, but not if the nutrient content is reduced by waste water and urine also mixed in.
Buy manures bagged, or find a local source.
- Ask what the creature has been eating. If a horse, you may get lots of weed seeds if they field forage. They only digest about 1/4 of all the grass and grains they consume. Cows, on the other hand, have 4 stomachs, so their manure is more digested, equals less seeds.
- Ask if the animals or chickens have been given any hormones or drugs like antibiotics.
- Has any of their food or bedding had an herbicide used on it?
- Ask if the manure pile has been sprayed with insecticide to kill flies or keep them away.
Rabbit or goat, sheep? Rabbit! It’s twice as high in Nitrogen, 3.5%! Work any of these three manures, these fab little pellets, fresh right into the top 2” of your soil! All that area that’s exposed makes them compost right in place quickly, and they don’t burn your plants! With bedding they are great in compost piles!
Cat, dog or pig manure are not good. They can have infectious parasites. Cat manure can be harmful to unborn babies.
One of the oldest, safest sources of Nitrogen, urea breaks down fast in your soil, compost pile or compost tea. The human NPK ratio is almost 45-0-0! Be careful, it’s potent. Dilute it, a lot, unless you use it along perimeters to discourage predators or gophers.
All raw bird manure is premixed with urine and manure.
- That would be bat and seabird guanos. Bird guanos are not a quick fix; they take awhile to break down in your soil. Adding guanos high in P, Phosphorus, at planting time is perfect timing for when your plants are ready to bloom! Some say they are better applied as foliar teas, but still, the release time per Colorado University Extension is FOUR MONTHS even for powdered guano! Know your guanos! Guanos vary hugely in NPK percents! Mexican bat is high N (leaf growth, plant vigor) 10-2-1. Jamaican bat is high phosphorus (blooms) 1-10-0.2. Peruvian seabird is high in N and P (leaf and bloom) 10-10-2.
- Chicken! Besides eggs, they make grand hot manure for the dollar! Perfect for high production leaf crops like lettuces. And, it suppresses nematodes. 3-4-2 Strawberries don’t like the salts in chickie manure.
- Pigeon?! Yes, prized in Europe as super manure! It’s the winner at 4.2-3-1.4 And, if you find it available, it’s likely free!
Vermicompost – worm manure! According to Rhonda Sherman, North Carolina State University:
‘Earthworm casts are covered with mucus from their intestinal tract; this layer provides a readily available carbon source for soil microbes and leads to a flush of microbial activity in fresh casts. Vermicompost improves soil structure, reduces erosion, and improves and stabilizes soil pH. In addition, vermicompost increases moisture infiltration in soils and improves its moisture holding capacity.
Plant growth is significantly increased by vermicompost, whether it is used as a soil additive, a vermicompost tea, or as a component of horticultural soilless container media. Vermicompost causes seeds to germinate more quickly, seedlings to grow faster, leaves grow bigger, and more flowers, fruits or vegetables are produced. These effects are greatest when a smaller amount of vermicompost is used—just 10-40 percent of the total volume of the plant growth medium in which it is incorporated. Vermicompost also decreases attacks by plant pathogens, parasitic nematodes and arthropod pests.’ The Soil Ecology Center at Ohio State University is the leading vermicomposting research laboratory in the United States. it includes scientific papers on vermicomposting.
Worms are easy to tend, use your green waste, you know what they have been fed. The more quality stuff you feed them, the more quality comes out!
Green Manure – Grow Your Own! Over winter, or when you soil will be unplanted for a time, legumes, like favas and clovers, and blue lupines, peas, clover, buckwheat, Lucerne, oats, broad beans and wheat, are perfect to plant. Not only are they a living mulch, but legumes feed your soil, gathering N from the air, depositing it in little nodules on their roots! Chop and drop your crop, dig it into the top 6” if you want to, leave all those nodules right where they will do the most good! Presto! Plant your crop in about 2 to 3 weeks!
Pellets or piles, be knowledgeable in your choices. A combination works best, providing the various nutrients your plants need for their overall health! Sometimes FREE is not a good choice. Ask questions and if you still don’t feel right about it when the ‘right’ answers are given, trust yourself. Could be the stuff is good but not the right thing for your plants right at that time. Or maybe the answers weren’t completely honest. Wait. Do something else. Or nothing. Your plants’ lives depend on you.
The Green Bean Connection started as correspondence for the Santa Barbara CA USA Pilgrim Terrace Community Garden. All three of Santa Barbara city’s community gardens are very coastal. During late spring/summer we are often in a fog belt/marine layer most years, locally referred to as the May grays, June glooms and August fogusts. Keep that in mind compared to the microclimate niche where your veggie garden is. Bless you for being such a wonderful Earth Steward!
Love your Mother! Plant bird & bee food! Think grey water! Grow organic!