Worldwide, farmers are being challenged with a variety of issues, including growing populations, a changing climate and soil degradation, among many others. To combat these challenges, researchers are looking for solutions and have begun to focus their research on the viability of sustainable agriculture practices, like cover crops.

“One of the main ways to improve the sustainability of agriculture is to utilize cover crops,” said Deepak Joshi, a recent Ph.D. graduate from South Dakota State University’s Department of Agronomy, Horticulture and Plant Science.

A cover crop is a plant that is used primarily to slow erosion and improve soil health. Cover crops are planted in the short time period following a harvest and are “killed off” prior to the planting of the next cash crop.

“It is assumed that cover crops will improve soil health and soil carbon,” Joshi added.

Joshi’s research provided an overview of conservation agriculture technology as strategies to minimize soil degradation, climate change challenges, and food insecurity issues in developing countries. It also investigated the impact of cover crops on soil organic carbon and greenhouse gas emissions in a corn cropping system through a meta-analysis of previous cover crop studies as well as through field experiment. The paper is published in the Agronomy Journal.

Cover crops

Experimental research on cover crops is widespread with more than 61 peer-reviewed cover crop studies having been completed and digitally available through May 2022. The challenge—as Joshi points out—is that the studies do not always provide a clear answer on the benefits of cover crops.

“There are numerous studies conducted about cover crops, but it is unclear whether they increase or decrease soil carbon,” Joshi said. “If you read through the published articles, some report an increase and others a decrease. The information provided was unclear.”

For his own research, Joshi combined all known cover crop studies (61) on corn cropping systems into one meta-analysis. It was found that cover crops increase the soil organic carbon by 7.3%—a significant amount.

Soil organic carbon is the measurable component of soil organic matter and is a key element in determining soil quality. A higher soil organic carbon percentage indicates greater soil health.

“Ultimately, cover crops are taking carbon dioxide from the atmosphere and stirring it into the soil,” Joshi said. “That means cover crops can help improve the growing climate problem and also help improve soil health.”

Joshi found that current corn fields with cover crops have a soil organic carbon (SOC) sequestration rate of .8 Mg. This means that if all U.S. corn fields used cover crops, 29.12 million Mg SOC could be sequestered annually, which equals 107 million metric tons of carbon dioxide. According to the Environmental Protection Agency, this is equivalent to the greenhouse gas emissions from nearly 247.5 million barrels of oil or 23.8 million gasoline-powered vehicles driven for one year.

“From the two-year field experiment conducted, we found rye cover crop during growth stage reduced N₂O emission while it increased during decomposition. However, when we combined both growth phases, cover crop and no cover crop treatment had similar emission. This means that cover crops have no effect on GHG emissions, instead it improves soil health by improving soil microorganisms, soil moisture and soil carbon,” Joshi said.

“It will also ultimately increase the crop yield for the next harvest season as well,” Joshi added.

The meta-analysis showed that adopting cover crops increased corn yield by 23%.

While cover crops have long had low adoption rates for farmers in the Upper Midwest, more are gaining a clear understanding of the proven benefits, and adoption rates have begun to increase in recent years.

More information: Deepak R. Joshi et al, A global meta‐analysis of cover crop response on soil carbon storage within a corn production system, Agronomy Journal (2023). DOI: 10.1002/agj2.21340

Journal information: Agronomy Journal 

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Introduction

Worldwide, water is becoming scarcer and more expensive due to the effects of climate change. Significant adaptation will be necessary to ensure adequate supply and efficient use of a diminishing resource. This reduction in the supply of water will affect agriculture and will require a change in focus from increasing productivity of land to increasing productivity per unit of water consumed. The need for increased water-use efficiency will be arising in a changing climate that will create abrupt fluctuations of temperature, precipitation patterns, drought, heat waves, stronger storms, flooding, wild fires, and pest outbreaks. Our soils, and our soil management, are not ready to meet these additional stresses. Too often, the approach to dealing with water deficits has focused on better technology: deeper wells, better drip emitters, more efficient micro-sprinklers, and variable-speed drives on pumps—all of which are important. However, a different approach to dealing with the oscillation between too little and too much water uses an appropriate technology that focuses on maintaining healthy soils by following five basic principles discussed in detail in the following sections.

Healthy soil, with its thriving biological activity, creates a system of air and water pores that both allow water to infiltrate the soil and hold that water in place. These pores help plant roots grow deep, holding soil in place while allowing water to infiltrate deep into the soil profile. As the amount of organic matter, or carbon, in the soil increases, so does the ability of that soil to hold water, release nutrients to the crop, and prevent erosion (Funderburg, 2001).

Attaining Healthy Soils

Soil experts across the country, including land grant universities, the USDA Natural Resources Conservation Service (NRCS), soil consultants, and farmer activists, have come to broad agreement about some general principles for restoring and maintaining soil health. These principles, when conscientiously applied to most farming systems, will improve soil health and function and likely reduce inputs. Water infiltration into soils is also improved, as well as the soil’s water storage capacity—important qualities when considering increasingly extreme rainfall patterns. Here we present five general principles for soil management that are responsible for increasing soil health and function.

The first principle: Protect the soil surface. Some people call this “soil armor.” This includes the use of cover crops and mulch, which provide many benefits for the land, including the following:

• Wind and water erosion are brought under control. Cover crops and mulch protect the soil as wind or water move across the soil surface. This holds the soil in place and allows increased water infiltration, not to mention providing organic matter and nutrients to the soil.
• Mulch reduces evaporation from the soil surface, reserving more moisture for plant use.
• Soil temperatures are moderated with cover crops and mulch, which act as a buffer, shielding the soil from extreme temperatures. The soil food web functions better when not subjected to extreme temperatures and humidity.
• Soil aggregation is preserved when rainfall hits the cover crop or mulch, dissipating the raindrop’s energy. When rainfall hits bare soil, soil aggregates are destroyed, erosion by wind and water is increased, and the soil is starved of oxygen and water. Fine clay particles seal the soil surface, dramatically reducing water infiltration and oxygen exchange into the soil.
• Weed growth is suppressed through competition with the cover crop and/or smothered with mulch.
• Habitat is provided by cover crops for beneficial insects and pollinators. Biological mulches/plant residue provides habitat for spiders, an important predator of agricultural pests.

At this Georgia cotton farm, the farmer chem-killed a small-grain cover crop and no-tilled cotton into it. The mulch adds organic matter, protects the soil from rains, and reduces water usage. Photos: Rex Dufour, NCAT

Raised beds with vetch cover crop, which protects the soil and provides Nitrogen. On this California farm, the farmer protects his soil from heavy winter rains by planting vetch cover crops on raised beds. In the spring, he’ll mow the cover crop, lightly incorporate the residue, and transplant processing-tomato seedlings into the beds. Photo: Rex Dufour, NCAT

The second soil health principle is to minimize soil disturbance of all kinds. Both physical (tillage) and chemical (overuse of fertilizers and pesticides) disturbance can disrupt the soil food web. Continuous tillage over time, without regular and significant additions of organic matter to the soil, degrades soil function and reduces soil pore space, which in turn restricts water infiltration and destroys the biological glues that hold soil together. Tillage in combination with overuse of fertilizers is like throwing gas on a fire. The excess nitrogen feeds bacterial populations, which explode when exposed to oxygen through tillage.

The problem is, these bacteria are feeding on the organic matter, which reduces organic matter levels unless significant crop residues, compost, or cover crops are added to the soil on a regular basis. Repeated tillage and overuse of chemical N, season after season, degrades soil structure and causes the soil aggregates that hold sand, silt, and clay together to fall apart, for lack of biological glues. This makes the soil an easy target for both water and wind erosion. Clay particles, released from soil aggregates by rainfall or irrigation droplets, will form an effective seal on the soil surface, preventing water infiltration to the root zone (or water table), increasing runoff and also creating anaerobic conditions in the root zone.

A diverse cover crop of more than a dozen species of grasses, legumes, and mustards helped the farmer at this Northern California walnut farm reduce his lesion nematode population from a count of more than 5,000 to “undetectable” over fi ve years. Photo: Rex Dufour, NCAT

The third soil health principle is plant diversity. Original landscapes in which soils were built over geological time consisted of a varied plant diversity, which was largely replaced by an annual (or perennial) monoculture when Europeans arrived. The soil food web used to receive carbon exudates (food) from the roots of a diverse group of perennial and annual plants. Each species of plant provides a unique set of root exudates, which in turn host a microbial community with some unique members, so a diverse aboveground plant community provides for a very diverse microbial community in the soil. In most cases, soils now receive root exudates from only one species of annual or perennial plant at a time. By using crop rotation, or rotating alley crops in orchards, we can start to better mimic the original plant diversity that benefits the soil food web. This, in turn, improves rainfall and irrigation-water infiltration and nutrient cycling, while reducing disease and pests. Diverse rotations in annual crops, which provide plant diversity over time, can keep soil healthy. For perennial crops, it’s important to rotate cover crops in alleys, as that will help ensure a healthy soil ecology and help prevent the build-up of soil pathogens. In pasture and rangeland, carefully managed grazing encourages plant diversity.

Having a diversity of crops on a field or a diverse rotation of different crops from different plant families both support a diverse soil ecology. Photo: Rex Dufour, NCAT

The fourth soil health principle is the concept of continual live plants/roots in the soil. The native vegetation in converted agricultural areas consisted of continuous stands of perennial and annual grasses and broadleaves providing carbon exudates to the soil food web during most of the growing season. Today’s croplands typically grow annual crops with an extended crop-free period of bare soil before planting or after harvest. It is extremely rare in nature to see vast expanses of bare soil. Bare soil does not receive any root exudates, and this starves the soil microbial community. Cover crops are able to fill in this crop-free period, providing cover to the soil and root exudates to the soil’s food web. Cover crops address a number of resource concerns already listed in Principle 1 and also provide an opportunity for livestock integration into cropping systems. In pasture systems, a diverse mix of warm-season and cool-season forage plants lengthens plant productivity over the course of the year, maximizing root exudation.

The grower at this operation has sheep grazing in the orchard, which is essentially providing two crops: grass and walnuts. This provides the grower savings on orchard floor management, as well as providing his trees additional nutrients. These sheep will be removed from the orchard four months prior to any harvest. Photo: Rex Dufour, NCAT

The fifth principle of soil health is the concept of livestock integration. Animals, plants, and soil have played a synergistic role together through geological time. Fewer farms are including animals as part of their operations, due to increasing specialization in growing only crops, combined with an increase in the number of confined animal operations. Returning animals to the agricultural landscape can contribute to soil health by adding some biology to the soil, especially if the land hasn’t had grazing animals on it. Livestock also convert high-carbon annual crop residue to low-carbon, high-nitrogen organic material, i.e., manure, which is beneficial to the soil. Some cover crops can be grazed without damage. Conversely, livestock can be used to manage an overly vigorous cover crop. Thoughtful integration of livestock onto cropping land can reduce weed pressure, herbicide use, and livestock waste associated with confinement, thereby improving water quality and addressing nutrient-management concerns.

Soils, Organic Matter, and Water: Why organic matter stores more water than sand, silt, and clay

Organic matter in the soil is made up of living, dead, and decomposed organisms. The living organisms in the soil, which represent roughly 15% of the total organic matter in the soil, vary from microorganisms like fungi, bacteria, and viruses to insects, plant roots, earthworms, and mammals. The dead organisms are recently deceased microbes, insects, earthworms, animals, and decaying plant material. The living organisms feed on both the living and the dead organisms, releasing proteins, sugars, and amino acids that feed plants and decomposers. The decomposition process and its various by-products also produce substances that hold sand, silt, and clay particles together to form aggregates and give them structure. This structure allows for efficient infiltration of rain and irrigation water into the root zone and, ultimately, into the water table. The smallest organic matter particles in the soil are called humus. Humus is a relatively stable part of the soil, a complex component that can buffer a plant from exposure to harmful chemicals, reduce the effect of compaction, improve drainage in clay soils, and improve water retention in sandy soils (Magdoff and van Es. 2009). This stable organic matter has surface charges that allow water to adhere to the surface. In addition, organic matter, being generally negatively charged, attracts positively charged ions (cations), many of which are important plant nutrients.

Increasing levels of soil organic matter can increase the cation exchange capacity (CEC) of soils, providing a reservoir of nutrients and micronutrients (calcium, potassium, magnesium, iron, manganese, ammonium, and others) especially needed in sandy soils with very low CEC levels. In fact, organic matter can have four to 50 times higher CEC per given weight than clay (Ketterings et al., 2007).

Large expanses of bare soil are an all-too-common scene in much of the United States. Lack of living roots in the soil starves the soil ecology, exposes the soil to both wind and rain erosion, and provides no habitat for beneficial organisms. We must do better to protect this precious resource. Photo: Rex Dufour, NCAT

Earlier research demonstrated that a silt loam soil with 4% organic matter holds more than twice the water of a silt loam with 1% organic matter (Hudson, 1994). Further recent research has shown that there have been overestimations on the relative contribution of soil organic matter to water-holding capacity, and it is influenced greatly by the soil physical properties (particle size, texture, and bulk density) and mineralogy. The increase of water-holding capacity as levels of organic matter are increased was more pronounced for sandy soils than for loam and clay soils (Minasny and McBratney, 2017; Libohova et al., 2018). This more recent research still suggests that for every percent of soil organic matter (SOM) in the top six inches, the soil will be able to store an additional 10,800 liters of water. But regardless of the soil type, adding organic matter to soil is beneficial for the numerous functions it provides besides increasing the soil’s waterholding capacity. Farmers investing in their soils by increasing organic matter and improving soil health will find that their soils will better support plant health, especially during times of drought and flooding.

Why You Can’t Manage What You Can’t Measure: Why soil moisture monitoring and irrigation distribution is important

Measuring irrigation distribution is important and especially effective when used in combination with practices that support a healthy soil. The moisture content of the soil regulates the moisture levels in the plant. Overly dry or overly moist soil stresses the plant and can induce diseases and reduce future seasons’ yields. This is why it is important to monitor soil moisture in order to schedule irrigation and provide the crop with adequate water to achieve ideal growth and yields. Soil moisture-monitoring devices use sensors and probes located in the soil root zone. Combined with information about temperature, evapotranspiration (evaporation from the soil and transpiration from the plant), and water requirements of the crop, these devices are able to provide the farmer with information that can be used to schedule irrigation properly.

Another important component in managing soil moisture is irrigation distribution uniformity. This measures how evenly water is applied to a crop across a field during irrigation. Microsprinklers often get plugged, as do drip emitters. Sprinkler heads get worn, and leaks in the system affect distribution uniformity, not to mention human error (a worker forgot to turn a valve, etc.). All these can significantly affect water distribution, and fertilizer distribution if the farmer is fertigating. If water distribution is uneven in a field, it will negatively affect yields. Inspecting and performing distribution evaluation in your irrigation system will identify the causes, and corrections can be made to eliminate plugging, minimize variation in pressure, and adjust flow rate, infiltration time, spacing, set duration, and land grading. The Irrigator’s Pocket Guide (see text box) has a wealth of information about distribution-system uniformity and maintenance.

Soil Health and the Future of Farming

Farmers across the country are operating in an era of uncertain weather and uncertain markets. Many farmers have reduced their input costs and increased their bottom lines by choosing to invest in soil health, just as they would in new machinery and maintaining farm structures. Healthy, living soils can better sustain the increased demands we’re placing on them to grow healthy food and maintain clean water and air. It is important to build and maintain soil health before drought or flood conditions appear. Healthy soils can better withstand climatic stresses of drought and floods and, in some cases, can help mitigate these stresses. All this requires an increased understanding about how to manage the soil as an ecology. Investments, such as adding organic amendments, practicing no- or reduced tillage, leaving crop residue, planting cover crops, and diverse crop rotations, will help the soil efficiently cycle both water and nutrients, sustain plant and animal productivity, and maintain or improve water quality. The return on soil health investments will pay off year after year after year.

Strategies to reduce crop water use:

• Maintain healthy, water-absorbent soils, following the five principles set out earlier in this publication
• Match plant genetics—varieties, growth characteristics, and tolerances (heat, salinity, pests, drought, early maturing, etc.)—to specific conditions
• Replace high-water-consuming crops with water-efficient crops
• Implement cultural practices: conservation tillage, planting densities, double cropping, intercropping, and crop rotation
• Improve irrigation timing through scientific irrigation scheduling, a systematic procedure that calculates precise water requirements over a short period of time to meet crop needs
• Manage deficit irrigations
• Use irrigation technology: sensor devices, probes, computer technology
• Utilize low-volume irrigation systems: drip irrigation and micro sprinklers, surge, and sprinkler
• Irrigate at night
• Practice weed control
• Apply mulches
• Reduce tillage

References

Funderburg, Eddie. 2001. What Does Organic Matter Do In Soil? Nobel Research Institute.

Hudson, B.D. 1994. Soil organic matter and available water capacity. Journal of Soil and Water Conservation. March/April. p. 189-194.

Ketterings, Q., S. Reid, and R. Rao. 2007. Cation Exchange Capacity (CDC) Fact Sheet 22.

Libohova, Z., C. Seybold, D. Wysocki, S. Wills, P. Schoeneberger, C. Williams, D. Lindbo, D. Stott, and P. R. Owens. 2018. Reevaluating the effects of soil organic matter and other properties on available water-holding capacity using the National Cooperative Soil Survey Characterization Database. Journal of Soil and Water Conservation. Vol. 73, No. 4. p. 411-421.

Magdoff , F., and Harold van Es. 2009. Organic Matter: What It Is and Why It’s So Important.

Minasny, B., and A.B. McBratney. 2017. Limited effect of organic matter on soil available water capacity. European Journal of Soil Science. Oct. 6.

Further Resources

ATTRA Resources:

• Building Healthy Pasture Soils. 2017. By Lee Rinehart, NCAT Program Specialist.
• Drought Resistant Soil. 2003. By Preston Sullivan, NCAT Agriculture Specialist.
• Measuring and Conserving Irrigation Water. 2006. By Mike Morris and Vicki Lynne, NCAT Energy Specialists.
• Soil Moisture Monitoring: Low-Cost Tools and Methods. 2006. By Mike Morris, NCAT Energy Specialist.
• Tipsheet: Assessing the Soil Resource for Beginning Organic Farmers. 2015. By Rex Dufour, NCAT Agriculture Specialist.
• Tipsheet: Compost. 2015. By Thea Rittenhouse, NCAT Agriculture Specialist.
• Soil Aggregate Stability: Visual Indicator of Soil Health. 2018. By Rex Dufour, NCAT Agriculture Specialist.

Crop Management in Drought.

Soil Moisture Measurement and Sensors for Irrigation Management. 2015. By Tiffany Maughan, L. Niel Allen, and Dan Drost.

University of California Drought Management. California Institute for Drought and Water Resources.

USDA. Natural Resources Conservation Service. Soil Health Literature-The Science Behind Healthy Soil.

Managing Soils for Water: How Five Principles of Soil Health Support Water Infiltration and Storage
By Martin Guerena and Rex Dufour, NCAT Agriculture Specialists
Published November 2019
IP594
Slot 618

This publication is produced by the National Center for Appropriate Technology through the ATTRA Sustainable Agriculture program, under a cooperative agreement with USDA Rural Development. ATTRA.NCAT.ORG. 

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WHY IS COMPOSTING A GOOD IDEA?

→ You can greatly reduce the waste in your home by recycling it into compost.

→ The compost you produce will improve your soil and save you money on buying fertilisers and soil amendments.

→ You will save money on your water bill as composting your garden beds increases water retention in soil.

→ Promote healthy fruit and flower production.

→ Prevent plant diseases.

→ Help the greater environment by reducing methane production in landfills.

→ Maintain a healthy ecosystem in your garden.

→ Promote beneficial microorganisms in your soil.

→ Prevent plant diseases.

→ Keep the soil food web system in your garden healthy.

COMPOSTING BASICS

There are certain elements that are generally required to make compost:

→ Air: Healthy bacteria that break down organic matter needs air to flourish; a lack of ventilation will lead to bad odours and attract vermin.

→ Water: Beneficial organisms that live in compost heaps need water to live and move around the pile.

→ Vegetable matter: The key ingredient for nutrient-rich compost or soil conditioner.

→ Brown biodegradables: Carbon-rich materials, paper, cardboard, woodchips, newspaper, wood branches and straw are essential for ventilation and keeping your compost heap moist.

→ Green biodegradables: Nitrogen-rich materials, grass clippings, leaf litter and dead plant material are essential to create the right temperature and to kill seeds and diseases.

→ Bacteria (EMOs): Decomposes organic matter.

→ Worms: Digest decomposed organic matter and make worm castings high in nutrients for plants to absorb.

→ Soldier flies: Devour food waste faster than worms and bacteria (not essential).

→ Other beneficial bugs: Cockroaches, white worms, millipedes, snails, slugs, mites and many more all help break down organic matter.

Keep a watchful eye on your compost pile to spot bad signs early and take the necessary steps to salvage it:

→ Material is not decomposing: The microorganisms are not thriving. Make sure that your ratio of green and brown biodegradables are balanced and that there is sufficient moisture.

→ Bad smells: This occurs when the pile does not have enough oxygen or is too acidic. Turn your pile and add brown biodegradables. If your pile has a lot of citrus peels, counteract it with ash or lime to restore the PH.

→ Pile is oozing liquid: The pile is too wet due to overwatering or adding too much vegetable matter. You can add brown biodegradables.

→ Dry leaves are not breaking down: Your pile is too dry. Adding vegetable matter will help.

→ Lack of insects: The ratio of your ingredients is off. Investigate what is lacking in green, brown and vegetable matter and moisture.

WHAT CAN BE COMPOSTED?

Brown biodegradables

→ Dry leaves

→ Plant stalks and twigs

→ Shredded paper and brown bags

→ Cardboard

→ Untreated wood

Green biodegradables

→ Food and vegetable scraps

→ Grass cuttings and garden waste

→ Coffee grounds and tea bags

→ Eggshells (crushed)

WHAT TO AVOID

Brown biodegradables

→ Disease- and pest-infested plants

→ Plants that have been treated with pesticides and herbicides

→ Treated or painted wood

→ Plastic bags, containers and labels

→ Glossy paper

Green biodegradables

→ Meat, fish and bones

→ Cheese and dairy products

→ Fats, oils and greases

→ Aggressive weeds with seeds

→ Cat and dog faeces

→ Plants that naturally repel insects: garlic, mint, lavender, citronella and mint

COMPOSTING METHODS

There are three main composting methods: aerobic (with air), anaerobic (without air) and vermicomposting (with earthworms).

1. Aerobic composting: This method entails speeding up decomposition with oxygen by turning or windrows.

Windrow is a method used on a large scale, forming long rows of organic matter and turning it mechanically or manually. Due to the labour or machinery required to turn the composting piles aerobic composting can be used on large scale, community gardens, large estates and restaurant waste.

Aerated static pile composting layers organic matter and bulking agents like cardboard and paper to allow for ventilation. Ventilation pipes can be placed to extract or blow air into the pile, depending on the pile temperature. This method is suitable for large domestic gardens and schools.

2. Anaerobic composting: Organic matter decomposes in an airtight container with the help of microorganisms. This takes a very long time and a large space is required.

3. Vermicomposting: Red earthworms are kept in a bin to break down food scraps to create castings and worm tea. The bins can vary in size depending on the amount of organic waste produced by the household or facility. This method is ideal for apartments, small offices and homes. It can also be scaled up to suit any size facility.

Home composting methods

→ Open-air composting: A pile of organic garden material in your backyard. An enclosure constructed with anything you can find or a plastic container turned into a compost bin. Start the pile with a layer of brown bulking agent like straw, paper, cardboard and woodchips. Layer your heap with garden litter or food scraps and bulking agents. Introduce a nitrogen-rich source like manure or grass clippings. Keep the pile moist.

→ Direct composting: Digging a trench in the ground and directly putting organic kitchen waste in and covering it with soil. This takes longer to decompose; you will need garden space for this. However, this method can attract unwanted animals into the garden.

→ Tumbler composting: A large bin that can be sealed attached to a structure allowing you to rotate it with your hand. You can purchase a tumbler bin in various sizes. This is an easy and effective way to speed up decomposition by turning your compost regularly and the container keeps the temperature high.

→ Worm farm composting:  There are various products to purchase, or you could make your own. All you need is a plastic container with a lid layered with brown biodegradables and food scraps. The brown biodegradables need to be kept moist (like a wrung-out sponge) but not wet to prevent rot and disease. Do not use earthworms from your garden – you can purchase earthworms at garden centres or ask a friend with a worm farm to get you started. A great by-product from this method is ‘worm tea’ – the liquid is regularly drained from the container and can be directly poured into pot plants. The worm castings are used as a soil conditioner in the garden or pots.

→ EMO composting: This is an anaerobic method. Food scraps and organic waste are kept in a sealed bin. A mix of microbes is added and the liquids that are produced are drained off until organic waste is fermented and ready to be used as compost. This method is odourless. Bokashi bins are used for indoor composting and is ideal for apartments.

→ Combination composting: A combination of open-air, direct, vermi-composting and EMO composting. This method is typically used by people who are familiar with the decomposition process and combines practices as they see fit.

Written by Charlotta Carolissen and published in Food&Home Autumn 2023.

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