Healthy soil is the foundation of high-quality, high-yielding forage crops. Whether you’re growing hay, alfalfa, corn silage, or managing grazing pastures, soil health directly impacts:

• Forage yield – more tons per acre

• Nutritional quality – higher protein, better digestibility

• Drought resistance – resilience during dry periods

• Input costs – reduced fertilizer and irrigation expenses

• Long-term productivity – sustained yields year after year

Research consistently shows that soil organic matter, microbial activity, and soil structure are the key drivers of crop performance. This page summarizes the science behind soil health and its measurable benefits for animal feed crops.

What you’ll learn:

• How soil organic matter increases biomass production

• Why healthy soil produces higher-protein forage

• How soil health reduces fertilizer costs through natural nitrogen cycling

• The role of soil in drought resistance and climate resilience

Long-term economic benefits of soil improvement.

Nitrogen Use Efficiency (NUE)

Reduced Fertilizer Costs

Healthy soil recycles nitrogen naturally:

Organic Matter Mineralization:

• Decomposing organic matter releases 90-100 kg nitrogen per hectare per year after the first year

• Provides sustained nitrogen availability without synthetic fertilizer

Legume Nitrogen Fixation:

• Alfalfa, clover, and other legumes in healthy soil can fix 32-115 kg nitrogen per hectare per year

• Reduces or eliminates synthetic fertilizer needs

Microbial Nitrogen Cycling:

• Healthy soil microbes convert organic nitrogen into plant-available forms

• Continuous nutrient cycling throughout the growing season

Research Finding:Mixed grass-legume pastures in healthy soil reduced nitrogen fertilizer requirements by 23-31 kg N per hectare compared to grass-only systems.

Improved Root Systems

Deeper, Stronger Roots

Healthy soil structure allows roots to penetrate deeply:

• Alfalfa tap roots – Can reach 10-15 feet deep in healthy, well-structured soil, accessing deep water and nutrients

• Grass root density – Ryegrass, fescue, and other grasses develop dense, fibrous root systems in aerated, organic-rich soil

• Mycorrhizal associations – Healthy soil supports beneficial fungi that extend root reach by 10-100x, improving nutrient and water uptake

Research Finding:Alfalfa cultivars with deep tap roots showed superior drought tolerance and nutrient acquisition—but only in soils with good structure and no compaction.

Long-Term Productivity & Sustainability

Soil Organic Carbon Sequestration

Healthy soil builds fertility over time:

• Carbon storage – Forage crops, especially perennial grasses and legumes, sequester 0.5-2 tons of carbon per acre per year in healthy soil

• Permanent soil improvement – Unlike surface mulch (which blows away), soil organic matter becomes permanent soil structure

• Compounding benefits – Each year of healthy soil management increases fertility, water retention, and productivity

Research Finding:Perennial forage systems with diverse plant species and healthy soil showed 10-50% increases in soil organic carbon over 5-10 years.

Superior Nutritional Quality

Protein Content

Healthy soil produces higher-protein forage:

• Nitrogen availability – Soil organic matter mineralizes nitrogen, which plants convert into protein

• Legume performance – Alfalfa, clover, and other legumes fix atmospheric nitrogen when grown in healthy soil with proper pH (6.5+) and active soil microbes

• Protein levels – Alfalfa and clover produce more protein per unit area than grasses, but only when soil supports healthy nodulation and nitrogen fixation

Research Finding:Alfalfa is the highest-yielding perennial forage legume and produces more protein per acre than other forage crops—but requires healthy soil biology to maximize nitrogen fixation (32-115 kg N per hectare per year).

Digestibility (D-Value)

Healthy soil improves feed digestibility for livestock:

• Water-soluble carbohydrates (WSC) – Grasses like ryegrass grown in nitrogen-rich, healthy soils produce higher concentrations of sugars and fructans, which improve digestibility

• Lower lignin content – Forage grown under optimal soil conditions has lower lignin (the indigestible fiber), making it easier for ruminants to digest

• Metabolizable energy (ME) – Higher digestibility means more energy available to livestock for milk production, weight gain, and reproduction

Research Finding:Perennial ryegrass has high digestibility due to high soluble sugar content and low lignin—but only when soil nitrogen and organic matter are adequate.

Preventing Nutrient Loss

Healthy soil holds nutrients in place:

• Reduced leaching – Organic matter binds excess nitrogen and prevents it from washing into groundwater

• Erosion prevention – Soil aggregates formed by organic matter resist erosion, keeping nutrients on the field

• Long-term fertility – Stable soil organic carbon persists for hundreds of years, providing sustained nutrient release

Temperature Buffering

Healthy soil moderates temperature extremes:

• Cooler in summer – Organic matter and soil moisture reduce soil temperature by 5-15°F

• Warmer in winter – Decomposing organic matter generates heat, extending the growing season slightly

• Frost protection – Improved soil structure reduces frost heaving and winter damage to perennial forages

Rapid Regrowth After Cutting

Healthy soil supports faster recovery:

• Stored carbohydrates – Plants grown in healthy soil store more energy in roots, enabling faster regrowth after cutting or grazing

• Nitrogen remobilization – Healthy soil microbes quickly mineralize nitrogen from cut plant material, making it available for regrowth

• Root exudates – After cutting, roots release carbon compounds that stimulate beneficial soil microbes, which in turn mobilize nutrients for regrowth

Research Finding:Ryegrass and alfalfa grown in nitrogen-rich, biologically active soil showed 8-16 day faster regrowth and higher yields after cutting.

Reduced Input Costs

Healthy soil lowers operating expenses:

• Less fertilizer – Organic matter mineralization and legume nitrogen fixation reduce synthetic fertilizer needs by 50-100%

• Less irrigation – Improved water-holding capacity reduces or eliminates irrigation costs

• Fewer pesticides – Healthy soil biology reduces disease and pest pressure

• Longer stand life – Perennial forages in healthy soil persist 3-5+ years without replanting

Increased Biomass Production

Healthy Soil = More Feed Per Acre

Three mechanisms drive higher yields:

1. Nutrient Availability

• Soil organic matter releases nitrogen, phosphorus, potassium, and micronutrients slowly over time

• Feeds crops throughout the growing season without expensive synthetic inputs

• Decomposing organic matter releases 90-100 kg nitrogen per hectare per year after the first year

2. Water Retention

• Soils with higher organic matter hold more water like a sponge

• Each 1% increase in soil organic matter increases water-holding capacity by up to 20,000 gallons per acre

• Reduces drought stress and extends the growing season

3. Root Development

• Healthy soil structure allows deeper, more extensive root systems

• Roots access water and nutrients more efficiently

• Alfalfa tap roots can reach 10-15 feet deep in well-structured soil

Research Finding:Alfalfa grown in soils with adequate nitrogen and organic matter showed 30-50% higher dry matter yields compared to depleted soils.

Trace Minerals & Micronutrients

Healthy soil delivers essential minerals to livestock:

• Zinc, selenium, iron, copper – Critical for livestock immune function, reproduction, and growth

• Balanced mineral uptake – Healthy soil biology helps plants absorb and store minerals in bioavailable forms

• Reduced need for supplements – High-quality forage from healthy soil reduces the need for expensive mineral supplements

Research Finding:Forage crops grown in mineral-balanced soils produce feed with better trace element profiles, directly improving animal health.

Drought Resistance & Climate Resilience

Water-Holding Capacity

Healthy soil acts as an underground water reservoir:

• Organic matter = sponge effect – Each 1% increase in soil organic matter increases water-holding capacity by up to 20,000 gallons per acre

• Drought resistance after year 2 – Buried organic matter (like from subsoil mulching) creates long-term water storage that releases moisture during dry periods

• Reduced irrigation needs – Some forage systems with high soil organic matter require zero irrigation after 2-3 years

Research Finding:Forage crops with high soil organic matter showed significantly better drought resistance and faster recovery after dry periods.

Disease & Pest Resistance

Soil Biology as Plant Defense

Healthy soil microbes protect plants:

• Beneficial bacteria and fungi – Suppress root diseases and pathogenic fungi

• Induced systemic resistance – Healthy soil microbes trigger plant immune responses

• Balanced pest pressure – Diverse soil biology supports beneficial insects and reduces pest outbreaks

Research Finding:Forage crops grown in biologically active soil showed lower incidence of root rot, nematode damage, and fungal diseases.

Specific Crop Benefits

Hay (Grass & Legume Mix)

• Higher protein – Legumes in healthy soil fix nitrogen, boosting protein content to 15-20%

• Better digestibility – Grasses grown with adequate nitrogen produce more sugars, less lignin

• More cuttings per year – Healthy soil supports 3-5 cuttings per season vs. 1-2 in poor soil

How Subsoil Mulching Improves Agricultural Soil

The Connection to Land Preparation

Subsoil mulching is a proven method for rapidly improving soil health when converting land to agricultural use:

Immediate Benefits:

• Grinds and buries vegetation, roots, and organic matter 6-10″ deep

• Creates immediate aeration and water infiltration

• Prevents regrowth, leaving land seed-ready

Long-Term Benefits:

• Buried organic matter decomposes over 1-10 years, releasing nutrients

• Increases soil organic carbon by 10-50% over 5-10 years

• Creates permanent water-holding capacity and drought resistance

Agricultural Applications:

• Converting brushy or overgrown land to pasture

• Preparing fields for hay or alfalfa establishment

• Renovating old pastures with compacted or depleted soil

• Creating food plots for wildlife management

 Learn more about the subsoil mulching process →

• 30-50% higher yields (more tons per acre)

• 50-100% reduction in fertilizer costs (natural nitrogen cycling)

• Reduced irrigation costs (improved water retention)

• Higher-quality feed (better protein, digestibility, minerals)

• Longer stand life (perennial forages persist 3-5+ years)

• Climate resilience (drought resistance, temperature buffering)