Planting for Tomorrow: A Farmer’s Guide to Cover Crops with USDA Support

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Cover crops represent a fundamental practice in sustainable agriculture, shifting the focus from solely harvesting a product to nurturing soil for long-term health and productivity. Unlike cash crops grown for sale, cover crops are plants—such as grasses, legumes, or brassicas—grown primarily to protect and enrich soil during periods when it might otherwise lie bare.

The use of cover crops is gaining significant momentum across the United States, increasingly recognized by farmers and gardeners for their substantial benefits.

The U.S. Department of Agriculture (USDA) strongly supports cover cropping through the Natural Resources Conservation Service (NRCS). The USDA views cover crops as a key strategy for building more resilient agricultural systems capable of withstanding challenges like erosion, nutrient loss, and extreme weather.

This commitment is evident in the development of specific guidelines, technical assistance programs, and financial incentives designed to help producers integrate cover crops successfully into their operations.

What Is a Cover Crop?

According to the USDA, a cover crop includes plant species (such as grasses, legumes, forbs, and brassicas) grown primarily for seasonal soil protection and improvement, rather than for harvest as a cash crop.

The primary purposes are conservation-oriented:

• Controlling wind and water erosion
• Enhancing soil health and organic matter
• Improving water quality by managing nutrients
• Suppressing weeds
• Breaking pest cycles

For USDA programs, particularly Federal crop insurance administered by the Risk Management Agency (RMA), proper management of cover crops is crucial. To ensure insurability of the subsequent cash crop, the cover crop must generally follow specific NRCS termination guidelines.

The wide variety of plants used as cover crops—from deep-rooted radishes to nitrogen-fixing clovers to biomass-producing cereals—reflects their versatility in addressing specific resource concerns and achieving diverse agricultural goals.

Benefits of Cover Crops

The USDA promotes cover cropping because of its interconnected benefits that contribute to healthier farms and a healthier environment. These advantages span soil structure, water management, nutrient cycling, pest control, biodiversity, and farm economics.

Building Better Soil

Cover crops significantly improve soil health by:

• Contributing to soil organic matter (SOM) through the decomposition of their roots and aboveground biomass
• Acting like a sponge to improve the soil’s water-holding capacity
• Enhancing soil structure by binding soil particles together into stable aggregates
• Providing food for diverse soil organisms, from earthworms to beneficial microbes
• Breaking through compacted soil layers with deep taproots (like forage radish or turnips)

These improvements create more resilient soils better equipped to support crop growth and withstand environmental stresses.

Reducing Soil Erosion

Cover crops protect vulnerable bare soil by:

• Providing a shield against rain and wind
• Intercepting raindrops, reducing the impact energy that dislodges soil particles
• Slowing surface water runoff, decreasing its power to carry away topsoil
• Binding soil with extensive root systems
• Maintaining ground cover during critical fallow periods

Improving Water Management

Cover crops play a crucial role in water conservation by:

• Enhancing water infiltration through improved soil structure and root channels
• Increasing the soil’s water-holding capacity through added organic matter
• Buffering against both drought and excessive moisture
• Reducing runoff that carries agricultural pollutants into nearby waterways

Smart Nutrient Management

Cover crops participate actively in farm nutrient cycles:

• Non-legume species (grasses like cereal rye and brassicas like radishes) scavenge residual nutrients, especially nitrogen, preventing leaching
• Legumes (clovers, vetches, peas) fix nitrogen from the atmosphere, reducing the need for purchased fertilizers
• Nutrients captured are gradually released back to the soil as plant residues decompose
• Enhanced soil biological activity leads to more efficient nutrient cycling

Natural Weed Suppression

Cover crops offer non-chemical weed control through:

• Direct competition for resources like sunlight, water, and nutrients
• Creating physical barriers or mulch that smothers weed seedlings
• Allelopathy, where certain cover crops release natural compounds that inhibit nearby weeds

Farmers like Zeb Winslow in North Carolina have cut herbicide applications by roughly 50% using cover crops.

Managing Pests and Diseases

Cover crops can help with pest management by:

• Disrupting pest and disease life cycles
• Attracting beneficial insects like pollinators and predators
• Releasing compounds during decomposition that suppress soil-borne pathogens (biofumigation)
• Acting as “trap crops” to lure pests away from cash crops

Increasing Biodiversity

Cover crops contribute to biodiversity both above and below ground:

• Providing food sources and shelter for wildlife, including pollinators and beneficial insects
• Fostering a richer soil food web through diverse root systems and organic inputs
• Enhancing overall health and function of the agricultural ecosystem

Economic Benefits

While cover cropping requires upfront investment, long-term benefits include:

• Modest yield increases in cash crops, particularly after several years of use
• Reduced input costs for synthetic fertilizers and herbicides
• Potentially less fuel and labor through reduced tillage
• Direct returns from grazing cover crops or harvesting forage
• Eligibility for USDA financial assistance programs

Implementing Cover Crops: USDA Recommendations

Successfully implementing cover crops involves careful planning and management. The USDA, through NRCS, provides detailed guidance to help producers make informed decisions that align with their goals and local conditions.

Selecting the Right Cover Crop

The first critical step is choosing appropriate cover crop species or mixes for your specific needs. Consider your primary objectives:

• Controlling erosion
• Adding nitrogen
• Scavenging leftover nutrients
• Breaking up soil compaction
• Suppressing weeds
• Providing livestock forage
• Improving soil organic matter
• Attracting pollinators

Different cover crop types excel at different tasks:

Grasses (cereal rye, oats, barley, annual ryegrass, sorghum-sudan grass):

• Produce high biomass for erosion control and organic matter
• Excel at scavenging nitrogen and suppressing weeds
• Develop fibrous root systems that improve upper soil structure

Legumes (crimson clover, hairy vetch, winter peas, balansa clover):

• Fix atmospheric nitrogen, reducing fertilizer needs
• Attract pollinators
• Provide moderate biomass

Brassicas (forage radish, turnips, rapeseed, mustards):

• Feature deep taproots that can penetrate compacted soil layers
• Effectively scavenge nutrients
• Some species have biofumigant properties against soilborne pests

Mixes/Cocktails (combinations of multiple species):

• Provide multiple benefits simultaneously
• Often produce more biomass
• Offer better resilience to variable conditions
• Support greater biodiversity
• May be more complex to manage

Regional adaptation is crucial—a cover crop that thrives in one region may struggle elsewhere due to climate differences, rainfall patterns, and soil types.

Valuable resources for making selections include:

• Your local NRCS field office staff
• University Extension specialists
• NRCS Plant Materials Centers (PMCs) – Find reports at the NRCS Plant Materials Program website
• Regional tools like the Northeast Cover Crops Council Species Selector Tool or the Pacific Northwest Cover Crop Selection Tool

Consider compatibility with your cash crops and be mindful of potential herbicide carryover effects.

Table 1: Common Cover Crop Types & Primary USDA-Recognized Benefits

Planting Methods and Timing

Several planting methods exist, each with advantages and disadvantages:

Drilling:

• Provides the best seed-to-soil contact and depth control
• Allows for lower seeding rates compared to broadcasting
• Requires specialized equipment
• Can be slower than other methods
• Ensure proper depth setting, especially for mixes with different seed sizes

Broadcasting:

• Faster and uses simpler equipment
• Success depends on timely rainfall or irrigation
• Less reliable seed-to-soil contact
• Often requires higher seeding rates (1.5-2 times the drilled rate)
• Works best with lighter residue levels
• Light incorporation after broadcasting can improve results

Aerial Seeding / Interseeding:

• Allows earlier establishment before cash crop harvest
• Extends the cover crop growing window
• Particularly beneficial in regions with short growing seasons
• Success depends on canopy conditions and moisture

Timing is critical for establishment. NRCS recommends planting cover crops as early as feasible after cash crop harvest, or even before harvest via interseeding, to maximize growth before cold weather or termination.

Adequate soil moisture and favorable temperatures are essential for germination. Prepare the seedbed by spreading residue evenly and controlling existing weeds that could compete with cover crop seedlings.

Seeding rates should match the species, planting method, and goals (higher rates for weed suppression).

In-Season Management

Once established, cover crops generally require minimal management, but consider these factors:

• System Compatibility: Ensure cover crop management fits within your overall cropping system.
• Herbicide Management: Check labels for plant-back intervals after cash crop herbicide applications and for restrictions on the subsequent cash crop if herbicides are used on the cover crop. A soil bioassay can test for potentially harmful residues.
• Grazing/Haying: Cover crops can provide valuable forage. Select palatable species suitable for livestock, but ensure the conservation purpose isn’t compromised. Check current crop insurance rules, as grazing or haying cover crops can affect insurance payments or eligibility.
• Legume Inoculation: For legumes planted in fields where they haven’t grown recently, treat the seed with the specific Rhizobium inoculant for that species to ensure effective nitrogen fixation.

Cover Crop Termination

Termination means ending the cover crop’s growth completely. This critical step influences soil moisture, nutrient release, and the success of the following cash crop.

Methods include:

• Natural: Winter kill terminates less cold-hardy species (oats, radish in colder zones)
• Chemical: Herbicides provide effective control
• Mechanical: Options include rolling/crimping, mowing, or tillage
• Grazing: Intensive grazing can sometimes terminate a cover crop

The timing of termination balances maximizing cover crop benefits with minimizing potential negative impacts on the cash crop and complying with USDA program rules.

NRCS developed Cover Crop Termination Guidelines primarily for non-irrigated cropland, dividing the U.S. into four zones based on climate and cropping systems.

Table 2: Simplified NRCS Termination Zone Guide (Non-Irrigated Cropland)

These guidelines have evolved over time. While strict adherence was often required for crop insurance initially, the 2018 Farm Bill prompted a shift. Now, cover crop management is generally reviewed under RMA’s standard Good Farming Practice (GFP) determination process, allowing more flexibility and adaptation to local conditions.

The core principle remains: cover crops must typically be terminated before the insured cash crop emerges. Additional flexibility exists for no-till systems or adjusting timing based on unusual weather conditions.

Practical Implementation

Moving from understanding cover crops to actually using them involves practical steps and addressing potential challenges.

Getting Started

For those new to cover cropping, careful planning is essential:

• Start small—try cover crops on a limited acreage for the first year or two
• Choose a cover crop species that reliably winter-kills in your region for simpler management
• Seek advice from neighboring farmers already using cover crops, your local NRCS conservationist, or University Extension service

Common Challenges & Solutions

While the benefits are numerous, farmers may encounter challenges when implementing cover crops:

Establishment Difficulties

• Problem: Poor stands due to unfavorable weather, poor seed-to-soil contact, heavy residue, or weed competition
• Solutions: Plant when moisture is adequate, select appropriate seeding methods, manage residue effectively, control competing weeds, choose tolerant species

Costs

• Problem: Expenses for seed, planting, and termination
• Solutions: Start small, explore USDA cost-share programs, factor in long-term savings, calculate grazing value if applicable

Time and Labor Constraints

• Problem: Cover crop operations often coincide with busy harvest and planting periods
• Solutions: Plan well in advance, choose efficient seeding methods, combine operations when possible, consider interseeding before harvest

Water Use Concerns

• Problem: Cover crops may deplete soil moisture needed by the following cash crop
• Solutions: Select lower water-use species, terminate earlier in dry conditions, recognize long-term improvements in water infiltration and storage capacity

Termination Challenges

• Problem: Achieving complete and timely kill can be difficult
• Solutions: Select appropriate termination methods, follow NRCS guidelines closely, have backup plans for unfavorable weather

Rotation Challenges

• Problem: Finding appropriate windows for establishing and terminating cover crops
• Solutions: Consider interseeding or aerial seeding, adjust cash crop rotations, select cover crops with suitable growth cycles

Surveys suggest that while farmers initially worry about costs, experienced cover crop users often find logistical challenges like establishment timing and species selection to be more significant hurdles.

Adaptation is Key

There is no single “right” way to use cover crops. Success depends on adapting the principles to each farm’s unique conditions—soil types, climate, existing cropping system, equipment, labor availability, and specific goals.

Be prepared to observe, learn from both successes and failures, and make adjustments over time.

USDA Support Programs

The USDA offers significant resources to help agricultural producers successfully adopt and manage cover crops. This support includes both technical expertise and financial assistance.

NRCS: Your Local Partner

NRCS staff work one-on-one with farmers, ranchers, and forestland owners to provide free technical assistance, including:

• Developing conservation plans tailored to individual operations
• Offering guidance on selecting and implementing practices like cover crops
• Helping producers address specific resource concerns

Your local NRCS office is the primary contact point for accessing this expertise.

Environmental Quality Incentives Program (EQIP)

EQIP is NRCS’s flagship voluntary conservation program offering financial and technical assistance to producers. It helps offset the costs of implementing conservation practices on working agricultural lands.

Eligibility:

• Agricultural producers, forest landowners, Indian Tribes, and others with an interest in the operation
• Must have control of the land and meet certain eligibility criteria
• Farm records must be established with the USDA Farm Service Agency (FSA)

Application Process:

1. Contact your local NRCS office to discuss your goals
2. Work with an NRCS planner to assess resource concerns and develop a conservation plan
3. Submit an application and required eligibility forms
4. NRCS checks eligibility and ranks applications based on anticipated environmental benefits
5. If selected, review and sign the EQIP contract outlining practices, schedule, and payment amounts

Funding for Cover Crops:

• EQIP provides cost-share payments to help cover implementation costs
• Payment rates are based on state-specific cost estimates and reviewed annually
• Standard cost-share rates may cover up to 75% of the cost
• Historically underserved producers may be eligible for higher rates (up to 90%) and advance payments
• EQIP typically funds first-time implementation or enhancements to existing practices

Conservation Stewardship Program (CSP)

CSP is designed for producers who are already demonstrating good stewardship and want to take their conservation efforts further. It provides payments for maintaining existing conservation and implementing additional activities.

Eligibility:

• Must meet a minimum stewardship threshold, assessed by NRCS
• Must agree to implement additional enhancements or practices during the contract period

Application Process:

• Similar to EQIP, with continuous acceptance and specific ranking deadlines
• Producers whose renewal applications were not funded can now re-apply immediately

Payments:

• CSP contracts last for five years, with renewal options
• Annual payments cover maintaining base conservation and additional activities
• Cover crop practices can be adopted through CSP enhancements like multi-species mixes
• CSP offers “bundles” of related enhancements with potentially higher payment rates
• Starting in fiscal year 2024, the minimum annual payment for CSP contracts increased to $4,000

How to Connect

To access these programs or get technical advice:

1. Contact your local USDA Service Center using the USDA Service Center Locator
2. Discuss your specific situation with NRCS staff
3. Get help navigating program options and the application process

Success Stories

Across the country, farmers and ranchers are demonstrating the real-world benefits of integrating cover crops into their operations.

Weed Control in North Carolina

Zeb Winslow, a fifth-generation farmer growing corn, soybeans, and cotton in eastern North Carolina, utilizes a diverse mix of cover crops including rye, triticale, oats, crimson clover, rapeseed, and vetch.

By using cover crops, often rolling them down at planting time, Winslow has reduced herbicide applications by approximately 50%. He reports spraying soybeans only once after planting and cutting cotton sprays from four or five times down to just two, plus spot treatments.

Soil Improvement and Grazing in Utah

The Pearson family, sixth-generation ranchers in Utah, are using cover crops as part of a transition towards rotational grazing with EQIP assistance.

They planted a 16-species mix including Austrian peas, turnips, triticale, wheat, and hairy vetch into their pastureland without prior tillage. The results were dramatic:

• Reduced soil compaction allowing better water infiltration
• Increase in soil organic matter by over one percent
• Improved erosion control near a spring and creek
• Extended grazing season, reducing the need for harvested feed

Urban Applications

Cover crops aren’t just for large farms. At the USDA Headquarters People’s Garden in Washington D.C., NRCS demonstrated planting cereal rye into raised beds after summer harvest.

The process is simple: rake aside mulch, broadcast seed, lightly rake it in, tamp the soil, and replace mulch. The cereal rye protects soil over winter, suppresses weeds, improves water infiltration, and traps nutrients.

These examples illustrate that cover crops, when thoughtfully selected and managed, offer tangible benefits across diverse agricultural landscapes and scales. They often form part of a larger system incorporating practices like no-till and diverse crop rotations, collectively enhancing farm productivity, profitability, and environmental performance.

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