Compost: Truth or Consequences - User's Guide
Contents
1. Moisture Aeration Surface Area Volume Cornell Waste Management Institute 1998 7 http cwmi css cornell edu Accompanying Materials Compost Truth or Consequences can be used in conjunction with The Master Composter Program Implementation Guide and Master Composter Resource Manual 1998 This two part manual provides the resources needed to create and implement a Master Composter program Part 1 the Master Composter Program Implementation Guide is designed for staff developing and implementing a Master Composter Program within a community It covers recruiting volunteers responsibilities and presents examples for community outreach and education programs Part 2 Master Composter Resource Manual is aimed at the Master Composter Volunteer This section describes the Master Composter Program teaches the science of composting illustrates methods for composting at home including vermicomposting and contains education and outreach activities that can be conducted by Master Composters The Manual can be downloaded at http cwmi css cornell edu mastercompostermanual pdf The manual plus the video Compost Truth or Consequences free download at http hdl handle net 1813 11313 can be purchased for 30 at http cwmi css cornell edu cupressorders htm Additional composting resources can be found on our web site http cwmi css cornell edu composting htm General http cwmi css cornell edu resources htm2. That s where a little compost know how can go a long way towards creating those ideal compost conditions A good composter focuses on the materials being composted and their preparation and provides the best conditions to ensure a healthy compost crop VIDEO QUIZ Help How do I decide what to put in my compost bin a Calla rocket scientist b Enroll in organic chemisty c Consult your Ouija board d Mix browns and greens Answer d Mix Browns and Greens Mixing browns and greens together in a compost pile can help to achieve the ideal 30 1 C N It helps to think of materials high in carbon as browns and materials high in nitrogen as greens One way to speed up decomposition is to combine carbonaceous brown materials such as autumn leaves with nitrogen rich green materials such as grass clippings to create a mix with a 30 1 carbon to nitrogen ratio The following chart provides some approximate C N ratios in various organic materials Average Carbon Nitrogen Ratios Food scraps 15 1 Grass clippings 19 1 GREENS Rotted manure 25 1 Cornell Waste Management Institute 1998 3 http cwmi css cornell edu 30 1 IDEAL for Composting Corn stalks 60 1 Leaves 40 80 1 Straw 80 1 BROWNS Paper 170 1 Sawdust woodchips 500 1 While you can get real scientific and calculate the Carbon Nitrogen ratios using algebraic formulas a good rule of thu
3. composting Youth and Teacher http cwmi css cornell edu resources htm youthteacher Glossary Actinomycetes A type of bacteria distinguished by their branching filaments called mycelia Include both mesophilic and thermophilic species In composting actinomycetes play an important role in degrading cellulose and lignin Aeration The process through which air in compost pores is replaced by atmospheric air which generally is higher in oxygen Aeration forced Addition of air to compost using blowers fans or vacuum pumps Aeration passive Relying on natural forces such as convection diffusion wind and the tendency of warm air to rise for movement of air through compost Aerobic 1 Characterized by presence of oxygen 2 Living or becoming active in the presence of oxygen 3 Occurring only in the presence of oxygen Anaerobic 1 Characterized by absence of oxygen 2 Living or functioning in the absence of air or free oxygen 3 Occurring only in the absence of oxygen Cornell Waste Management Institute 1998 8 http cwmi css cornell edu Bacteria Single celled microscopic organisms lacking an enclosed nucleus Members of the kingdom Monera Commonly have a spherical rod or spiral shape Base A substance with pH between 7 and 14 Batch composting Composting in which all of the ingredients are added at once rather than continuously over a period of time Biodegradable Capable of being br
4. or stunt plant growth Pore An open area between particles of compost or soil filled by air or water Porosity The percentage of the total soil or compost volume that is occupied by open spaces rather than solid particles Protozoa Single celled animal like microorganisms belonging to the kingdom Protista Many species live in water or aquatic films surrounding soil or compost particles Screening The process of passing compost through a screen or sieve to remove large pieces and improve the consistency and quality of the end product Soil amendment Any substance that is used to alter the chemical or physical properties of a soil generally to make it more productive Examples include compost lime sulfur gypsum and synthetic conditioners Usually does not include chemical fertilizers Stability A measure of whether compost has decomposed to the point at which it does not reheat produce offensive odors or support high rates of microbial growth when optimal moisture levels are supplied Temperature profile A graph of temperature changes that occur during the process of thermophilic composting Thermophilic 1 Organisms that grow best at temperatures above 104 F 40 C 2 The phase of composting that takes place at temperatures exceeding 104 F 40 C 3 The type of composting that includes a stage occuring above 104 F 40 C Turning In a compost pile mixing and agitating the organic material Turning
5. other starting with either green plants or organic detritus as the primary energy source Food web The network of interconnected food chains found in an ecological community Fungi Plural of fungus A kingdom that includes molds mildews yeasts and mushrooms Fungi lack chlorophyll feed on dead organic matter and reproduce by spores Unlike bacteria fungal cells do have nuclei Some fungi grow cellular filaments called hyphae or mycelia Heavy metals Metallic elements with high molecular weights Includes cadmium lead copper mercury chromium silver and zinc High concentrations in soil can be toxic to plants or to animals that eat the plants or soil particles Holding unit A simple container that holds landscaping garden and food wastes while they break down Humus The stable organic complex that remains after plant and animal residues have decomposed in soil or compost Hyphae Branched or unbranched chains of cells as in fungi and actinomycetes Cornell Waste Management Institute 1998 9 http cwmi css cornell edu Inoculant Microorganisms that are introduced into compost or other culture media Inoculate To introduce pure or mixed cultures of microorganisms into culture media Inorganic Mineral rock metal or other material containing no carbon to carbon bonds Not subject to biological decomposition Invertebrate An animal without a backbone such as an insect or worm Leachate The liquid ext
6. User s Guide Produced by Cornell Waste Management Institute Compost Truth or Consequences To be used in conjunction with Compost Truth or Consequences 15 minute video about backyard composting for use with master composters or anyone else interested in composting Contents PUT POSE of VICE O eaten iti ieten eer ee sE aa EEE a ERE EA page 2 Why COmMmpo stere r E E E E page 2 Do You Know the Answers eesssesesssessseseessersserressstesseressseesseresssresseressseessee Page 3 How Does a Compost Pile Work ssssesesseeesseeessesessseesseressseesseresssreesseeessseesse page 4 Accompanying Materials eseeeesseesseseesseeessreesssrsssstessseeessreessreessreessreesssees page 8 Additional Composting Resources sesseessessesssessssressseeessreessreessreessreesssre page 8 COSA aree E a E E E ER page 8 Purpose of Video Cornell Waste Management Institute 1998 1 http cwmi css cornell edu Compost Truth or Consequences is designed to introduce viewers to the science of backyard composting The goals of the video presented in a game show format are e to expose potential composters to the concept of composting i e recycling organic matter into a useable soil enrichment product and to reduce the amount of waste going to the landfill or incinerator e to provide an overview of the science involved in composting e to help home composters avoid problems and e to motivate composters to educate and enthuse other
7. a pile a higher surface area for a given volume results in greater heat loss VIDEO QUIZ Help I wanthot compost How big should I make my bin a Asbig asa bread box b Smaller than the Hindenberg c No bigger than your head d Atleastone cubic meter Answer d At least one cubic meter Cornell Waste Management Institute 1998 6 http cwmi css cornell edu As arule of thumb home compost piles should be about as big as one cubic meter 3 ft by 3 ft by 3 ft or 1 cubic yard A smaller pile unless properly insulated will dry out easily and cannot retain the heat required for quick composting Larger piles have a smaller relative surface area and lose heat to the environment more slowly but large piles must be turned frequently or have ventilation stacks placed throughout the pile to allow air into the interior so anaerobic conditions are prevented A home compost pile built with proper consideration of carbon to nitrogen ratios temperature moisture aeration surface area and volume can produce compost ready for curing as quickly as three weeks With less attention to the details of materials used and the environment provided for them a cooler slower pile can also be built Low maintenance methods of composting will still create an excellent compost but will take much longer anywhere from 6 months to 2 years to yield finished compost Creating the Ideal Compost Conditions Q Carbon to Nitrogen Ratio Temperature
8. e in the absence of oxygen can take over the pile Anaerobic decomposition is slow and can produce unpleasant by products Sometimes a compost pile can start to smell like rotten eggs This is usually due to anaerobic conditions VIDEO QUIZ Help My compost smells like rotten eggs What do I do a Hand out respirators b Spray with perfume c Gamish with cheese and salsa d Add a dry coarse matenal Answer d Add a dry Coarse matenal The compost must be moist enough to support microbial growth but not so water logged that air can t circulate through the pile Porosity is essential for proper aeration Air gets into the center of the pile by moving in the spaces between compost particles Aerobic organisms in the film of water surrounding the particles use the oxygen in air to break down organic material If there is too much water the pores fill up and oxygen can no longer penetrate the pile Adding a dry coarse material often called a bulking agent to a soggy bin can help dry it out and increase porosity As a general rule a compost mixture should be about as dry as a wrung out sponge The squeeze test for moisture content is a good indicator only a drop or two of water should be expelled from the mixture when tightly squeezed by hand For fast efficient composting a compost pile must be large enough to hold heat and moisture and small enough to admit air to the center Heat loss depends on the size and shape of
9. es of great concern in many communities landfills are filling up garbage incineration is unpopular and other waste disposal options are becoming harder to find Composting provides a way of not only reducing the amount of waste that needs to be disposed of but also of converting it into a product that is useful Cornell Waste Management Institute 1998 2 http cwmi css cornell edu Compost Truth Or Consequences Do You Know the Answers VIDEO QUIZ What do a picnic and a compost pile have in common Answer A compost pile is a catered picnic for millions of guests Like people decomposers bacteria microbes fungi worms and other invertebrates require a balanced diet to survive Many types of decomposers are at work in the compost pile Each type thrives on special conditions and different types of organic materials Understanding how to create the ideal composting conditions will help the home composter make compost quickly and to diagnose and solve any problems that might arise Microorganisms in the compost pile use carbon C for energy and nitrogen N for protein synthesis just as people use carbohydrates for energy and protein to build and repair bodies The balance of carbon and nitrogen in a compost pile is called the carbon to nitrogen ratio C N Ideal composting conditions will have a 30 1 carbon to nitrogen ratio Most materials available for composting however don t have the ideal carbon to nitrogen ratio
10. ication through a microscope Mulch Any material such as compost bark wood chips or straw that is spread on the soil surface to conserve soil moisture suppress weed growth moderate temperature changes or prevent soil erosion Mycelia Branching networks of fungal hyphae Nitrifying bacteria Bacteria that transform ammonium NH g to nitrate NO7 and then to nitrate NO3 Nitrogen fixing bacteria Bacteria that transform atmospheric nitrogen N2 to ammonium NH Organic 1 Pertaining to or derived from living organisms 2 Chemical compounds containing carbon to carbon bonds Organic matter Material that has come from something that is or was once alive Oxidation A chemical reaction in which an atom loses electrons or increases in oxidation number Cornell Waste Management Institute 1998 10 http cwmi css cornell edu Pathogen Any organism capable of producing disease or infection in other organisms Percolation Downward movement of water through pores in rock soil or compost Permeability The ability of a soil to allow the movement of water through its pores pH The degree of acidity or alkalinity of a substance expressed as the negative logarithm of the hydrogen ion concentration Expressed on a scale from 0 to 14 pH lt 7 is acidic 7 is neutral and gt 7 is alkaline or basic Phytotoxicity A measure of the ability of a substance to suppress seed germination injure plant roots
11. iles or proliferate only when hot piles start to stabilize at lower temperatures VIDEO QUIZ Help My compost reeks of ammonia What do I do a Give up composting b Move c Use itto mop your floors d Add more brown materials Answer d Add more brown materials A compost pile can start to emit an ammonia like smell This is usually caused by too much nitrogen in the pile Bacteria use nitrogen to build proteins for new cells If there isn t enough nitrogen the bacteria won t be able to reproduce quickly and the pile will remain cool But if there is too much nitrogen for the available carbon the microbes can t use all the nitrogen and it is released as ammonia Adding more carbonaceous brown materials and turning the pile will create a better C N ratio and should eliminate the ammonia smell Cornell Waste Management Institute 1998 5 http cwmi css cornell edu All compost organisms need a certain amount of water and air to survive The amounts of air and water in a compost pile form a delicate balance that must be maintained for rapid decomposition to take place Too much air circulating in the pile can make the pile too dry for bacteria to function At less than 40 percent moisture the bacteria are slowed by the lack of water At greater than 80 percent moisture the pore spaces between particles fill with water so there is not enough air for aerobic decomposition to continue Anaerobic bacteria which thriv
12. le temperature range bacteria MESOPHILIC THERMOPHILIC MESOPHILIC PHASE PHASE PHASE 10 40 C gt 40 C 10 40 C Cornell Waste Management Institute 1998 4 http cwmi css cornell edu Mesophyllic bacteria thrive at temperatures from 70 90 F 21 32 C and survive from 40 70 F 4 21 C or from 90 110 F 32 43 C In many compost piles these efficient mid range bacteria do most of the work However given optimal conditions they will produce enough heat to kick in the next group of bacteria the thermophilic or heat loving bacteria Thermophilic bacteria work fast in a temperature range of 104 170 F 33 76 C Unless the pile is fed new materials or turned at strategic times they will work for only 4 to 7 days until their activity peaks and the pile cools down below their optimum range In that short time they turn green gold and tan organic material into a uniform deep brown If the pile is turned to let more air in the thermophilic bacteria will feast for another 4 to 7 days Large compost piles with a volume of several cubic yards or more can retain enough heat to keep thermophilic bacteria alive for several weeks or longer In all of this work the bacteria are not alone though at first they are the most active decomposers Other microbes fungi and a host of invertebrates take part in the composting process Some are active in the heating cycle but most organisms prefer the cooler temperatures of slow compost p
13. mb is to layer or mix materials in your compost pile so that you have roughly equal amounts of high nitrogen greens and high carbon browns How Does A Compost Pile Work The most numerous organisms in a compost pile are bacteria Most bacteria are too small to see individually but it is easy to see the effects of bacterial work in a compost pile Bacteria generate the heat associated with composting and perform the primary breakdown of organic materials Many types of bacteria are in the compost pile Each type thrives on special conditions and different types of organic materials Even at temperatures below freezing some bacteria can be feeding on organic matter These psychrophilic bacteria a grouping of bacterial species that includes all those active in the lowest temperature range do their best work at about 55 F 13 C but they are able to carry on right down to 0 F 17 C As these bacteria eat the organic materials they give off a small amount of heat The temperature in the compost pile will rise whenever microbial heat production exceeds heat lost to the environment Therefore to increase the temperature it is necessary to encourage heat production by supplying ideal conditions for the bacteria or to prevent heat loss by constructing the pile appropriately If conditions are right for them to grow and reproduce rapidly this heat will be sufficient to set the stage for the next group of bacteria the mesophyllic or midd
14. oken down through biochemical processes Bulk density The mass per unit of volume of dry soil or compost including air filled pores Bulking agent A material used in composting to maintain air spaces between particles Carbon to nitrogen C N ratio The ratio of the weight of organic carbon to the weight of total nitrogen in soil compost or other organic material Compost v The process of decomposition of organic materials under controlled conditions n the humus like material produced by decomposing organic materials under controlled conditions Compost quality The suitability of a compost for use with plants Compost that impairs seed germination or plant growth is of low quality either because it is not yet fully decomposed or because the initial ingredients contained contaminants that are phytotoxic Compost system The method used to convert organic wastes into a stable end product Examples range from large outdoor windrows or piles to small indoor bioreactors Curing period The period required to finish the process and to develop the desired characteristics of a mature compost It is recommended that the curing period be at least one month Debris Dead organic matter Decomposer An organism that feeds on dead organic matter and aids in its degradation Detritus Dead organic matter Feces Wastes discharged from the intestines of animals Food chain A hierarchical sequence of organisms that feed on each
15. ract that results when water comes into contact with a solid such as soil or compost In composting leachate containing dissolved and suspended substances drains from the system as organic matter decomposes Lignin A series of complex organic polymers that are highly resistant to microbial decomposition In wood lignin cements cellulose fibers together and protects them from chemical and microbial decomposition Lime Calcium compounds used to neutralize acidity in soils Macroorganism An organism large enough to be observed with the naked eye Maturity A measure of whether compost has completed not only the phase of rapid decomposition but also the longer curing phase during which slow chemical changes make the compost more suitable for use with plants Mesofauna Soil dwelling invertebrates that are large enough to tunnel their way through soil or compost Includes nematodes mites potworms ants insect larvae and others Mesophilic 1 Organisms that grow best at moderate temperatures 50 104 F 10 40 C 2 The phase of composting that takes place at temperatures in the range of 50 104 F 10 40 C 3 The type of composting that does not reach temperatures exceeding 104 F 40 C Microfauna Soil protozoa and other microscopic fauna that are generally capable of moving through existing soil pores Microbe A microorganism Microorganism An organism that individually is too small to be observed without magnif
16. s about home composting Why Compost All organic matter if left to Nature eventually decomposes and becomes part of the soil supplying nutrients to enrich and replenish the earth Composting is simply a way to help speed up the natural recycling process of decomposition Anything that is alive or was once alive is organic Some of the common organic materials that we use and dispose of daily are food clothing and furnishings building materials paper products animal wastes and landscape trimmings In fact organic materials account for much of what we consume and throw away every day According to a recent U S Environmental Protection Agency analysis of the total solid waste stream by weight paper products alone make up 39 percent of our garbage landscape trimmings comprise more than 14 percent and food wastes account for almost 7 percent Due to the sheer volume of organic wastes produced the way that we choose to handle these materials is one of the most important waste management decisions that we face today Why compost There are a number of reasons When organic materials are separated from trash and allowed to decompose with an adequate supply of air they can be turned into a valuable soil amendment that can be used for all sorts of things plant and vegetable gardens landscaping projects land reclamation and restoration or replacement of worn out or contaminated soils Composting also provides a partial solution to some issu
17. unit Three holding units built next to each other so that compost can be turned from one into the next Vermicompost v To decompose organic matter using worms n The product obtained through decomposition of organic matter by microorganisms and worms Windrow An elongated pile of organic matter in the process of being composted Yard and garden wastes Grass clippings dead leaves small branches weeds and plant residues Cornell Waste Management Institute 1998 11 http cwmi css cornell edu
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