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 

The post Cover crops contribute to soil health, study shows appeared first on IPNN.

Allison Lynch, Staff Writer

2 TYPES OF LIVESTOCK: While the cattle may seem like the only livestock in this field, there is another type of livestock just below the soil surface. Viewing soil microbes as “livestock” will help you care for the soil and better provide for your crop. One measure taken here to feed the soil microbes is maintaining a growing crop all year. Allison Lynch

Soil health has a direct impact on plant health, and caring for your soil first means the benefits of healthy soil can provide immediate effects to your crop. As Neal Kinsey, owner of Kinsey Agricultural Services, puts it, fertility required for the soil and plants are one and the same.

“The soil is the plant’s stomach,” he says. “And when we mess up the soil, we’re messing up digestion for the plant.”

Kinsey recommends viewing the organisms in your soil as “livestock” to help you focus on properly caring for and maintaining them. For example, he shares that an accurate depiction for very poor soil life in need of help could be one cow per acre when it comes to the inputs needed to care for the soil microbes. This simply makes it easier for you to view the soil as a living medium when making amendments and improving soil health.

Feed ‘the cow’

Caring for the “cows” in your soil may seem daunting, but there are some tips for success when it comes to improving soil health. Kinsey and RJ Rant, owner of Terraform Ag and Nutrilink Biosystems, share how you can feed your soils to in turn feed your plants:

Keep a growing crop. Including a cover crop in the off-season can improve soil microbe presence and microbe community structure. You are not able to grow the soil without growing a crop.

“A soil not growing anything is a soil dying,” Rant says. He adds that implementing crop rotation and cover crops will help you continue to improve soil health.

Move past sufficiency. Simply supplying enough nutrients to reach sufficiency levels will not help you feed and improve your soils, Rant shares. Getting past the “just enough” level of fertility will continue to develop soils rather than maintaining the current growing crop.

“If you go past sufficiency and have abundance, you can better drive photosynthesis,” Rant adds.

Correct all your soils. Don’t only focus on your problem soils when improving soil health. Kinsey says when you do that, another field can quickly become the problem. Rather, spend time learning more about how you can improve all your fields and soils, even if they do not present any issues in the short term.

“To maintain top yields, even the best soils at times need corrections,” Kinsey says.

Study nature. It can be easy to head online and look up how to improve your soil problems, but ultimately, you will learn more by doing. Test different practices and experiment with soil amendments until you see what pays off in your crops.

“How do you know what works?” Kinsey asks. “You do it yourself. You find out for yourself. And you don’t find out everything at once.” He adds that you should test things for at least three years before you judge whether it works or not.

Minimize disturbances. All disturbances will affect soil function, according to Rant. He shares that tillage events can be viewed as concussions. Over time, those events can build up and cause a chronic issue with soil fertility and, ultimately, plant performance.

“If you’re making a disturbance, have a good reason,” Rant adds.

Viewing soil as an ecosystem or thinking of soil microbes as your livestock will help you shift your focus to improving soil health and structure to care for your crops.

“It’s not just dirt, which is your sand, silt and clay,” Rant says. “It’s humus and living organisms, and it’s how those things are interacting constantly.”

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The catch is there’s still no agreed-upon definition for regenerative agriculture. So how can food products branded as regenerative be verified if meanings are disputed?

There’s no way of knowing whether “regeneratively grown” claims are genuine or effective without a monitoring, reporting and verification system. How does regenerative compare to organic? Many farmers and researchers worry the term is ripe for greenwashing in food marketing and product labelling.

The first thing to say is that this term has been around for decades.

Take 21st-century regenerative agriculture champion Gabe Brown. He is a well known North Dakota rancher and author of From Dirt to Soil, the holy grail of regenerative agriculture manuals. Brown documented how he replaced synthetic fertilisers with compost and diverse cover crops. He transformed his parched, trampled and microbe-depleted soil into a nutrient-rich system and boosted crop yields. He has inspired farmers worldwide.

The original definition of regenerative agriculture, coined by Robert Rodale of the Rodale Research Institute in the US over 40 years ago, focused on soil biology as the key to supporting nutrient recycling between plants, animals and the land, leading to healthier crops and improved economic productivity without agricultural chemicals.

Even back in 1943, The Living Soil by British farmer and botanist Eve Balfour critiqued chemical-intensive industrial farming practices. Her book was a seminal text in the organic farming movement and led to her founding the Soil Association charity.

Regenerative and organic methods overlap. Both involve crop rotation (changing the crop type grown in a field to manage pests and minimise disease) and diverse cover cropping (growing beneficial crops to protect the soil all year round alongside production crops to prevent erosion and increase organic matter).

They both require minimum or no ploughing (leaving the soil partially or completely undisturbed to maintain soil structure, hold water and allow soil organisms to thrive), and focus on composting (turning organic matter into nutrient-rich material for soil microbes).

Both types of farming also welcome cows, pigs, sheep and other livestock onto farmland to fertilise the soil by grazing and pooing. And both prioritise soil health and see chemical inputs as harmful to thriving ecosystems.

But regenerative agriculture is not just another way of saying “organic”.

Organic is a much more prescriptive definition. It has strict rules, certification standards and inspections from certifying bodies. Organic excludes the use of synthetic pesticides, fertilisers and genetically modified seeds.

It enables certified organic farmers to enjoy premium prices and offers consumers assurance about what organic does and does not allow. It offers transparency on agrichemicals, though does not offer data and information about biodiversity or greenhouse gas emissions.

Regenerative, in definition and practice, is not so clear – it operates as a broad set of guiding principles that can be adapted to a particular farm circumstance in a flexible way.

This ambiguity is a double-edged sword. It gives farmers the freedom to tailor regenerative principles to their contexts, but it can also leave consumers feeling dazed and confused.

Many UK farmers view this flexibility as necessary, given each farm operates within a different combination of local environmental conditions (like soil type or microclimate) and business goals. A one-size-fits-all definition and approach to regenerative agriculture seems impractical in such diverse settings

This is where it gets messy. An organic carrot might be grown in a monocultured system (associated with reduced biodiversity), while a regeneratively farmed carrot might be grown in a biodiversity-rich cover-cropped system, but with the use of some synthetic chemicals like glyphosate.

The lack of a standardised definition risks undermining the credibility of regenerative farming. Certification programmes aligned with regenerative principles could help regenerative agriculture gain more accountability while staying true to its core vision. Without monitoring, reporting and verification systems in place, it’s very difficult for farmers to credibly market their crops as “regenerative”.

Shopping for regenerative foods

Regenerative agriculture could drive the expansion of carbon-neutral foods beyond speciality products like chocolate, wine, coffee and tea, to more everyday items in our shopping baskets.

By design, regenerative agriculture lowers greenhouse gas emissions associated with farming — everything from potatoes and wheat to bananas and tomatoes. It reduces the reliance on synthetic fertilisers which are carbon intensive to produce, cuts fuel use and promotes no or minimum tillage and cover cropping that pull carbon from the atmosphere into the soil.

If evidenced through regenerative agriculture standards and certifications, these efforts could create a food system that is not only sustainable, but also carbon neutral. As this movement gathers momentum, it could reshape supply chains and up the ante on corporate sustainability commitments. Supermarkets and businesses might proactively choose to source their food products from regenerative farms to reduce their climate impact.

So, what does all this mean for your weekly shop? While the term regenerative might not yet offer the clarity of organic, your consumer choices matter. When you buy food labelled as regenerative, you’re signalling to the retailer that soil health and sustainability matter to you.

Hold suppliers to account by asking questions. Look for clear information about how products are sourced, the farming practices used and the environmental impact of those practices in labels. Do any certifications or reports verify these practices? Are greenhouse gas emissions reported? Which environmental outcomes have been achieved?

We believe that the revival of regenerative agriculture has potential to help reform and transform our food and farming systems. The future of carbon-neutral food hinges on clear accountability measures and how this regenerative agriculture market evolves.

By Jessica Chapman and Brian Reid

The post Regeneratively farmed is the new buzz label on supermarket shelves – but what does it actually mean? appeared first on IPNN.

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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