Soil Health on Dairy Farms

Healthy soil grows better feed, holds water and loses less to runoff. On a dairy farm, manure and forage rotations give you a head start.

Key points

Healthy soil holds water, resists erosion and supports steady yields.
Less disturbance, more cover and living roots, and crop diversity are common principles.
Use manure by test and plan, and avoid wet-field traffic.
Dig and observe each year and keep records.
Try one change on one field first.

What soil health means

Soil health describes how well the soil works as a living system. It includes structure, organic matter, biological activity, drainage and the ability to hold water and nutrients. Healthy soil resists erosion and supports steady yields.

Every farm starts from a different place. Soil type, slope, rainfall and past management all matter, so goals should match your fields.

Compare fields to one another on your own farm. A field that has been in sod for years often looks very different from one in continuous corn. Those differences show what is possible with a change in management.

Principles most advisers teach

Extension and NRCS programs commonly teach a few basic ideas. Disturb the soil less, keep it covered, keep living roots growing as long as you can, and grow a diversity of crops. Manage grazing and animals in ways that support the soil.

Each farm applies these ideas differently. A silage corn operation and a pasture-based herd will use different tools.

Perennial forages are a strength on dairy farms. Alfalfa and grass keep roots in the soil for much of the year and reduce erosion, and they fit well in a rotation with corn silage. Ask your agronomist how rotation length affects your yields and soil.

Reduce tillage where it makes sense
Keep residue and cover on the surface
Keep living roots in the ground
Rotate and diversify crops
Use manure and fertilizer by the plan

Manure as a soil resource

Manure supplies nutrients and organic matter. Applied at the right time and rate, it feeds crops and builds soil. Applied badly, it can run off or compact wet ground.

Test manure and soil, follow your nutrient management plan and avoid heavy equipment on wet fields. Incorporate or inject where your plan and soil conditions call for it.

Be careful with timing. Manure applied just before heavy rain can run off, and applying it on frozen ground carries risks. Follow your plan and state rules, and leave buffers beside ditches and streams.

Compaction, traffic and drainage

Heavy wagons, spreaders and choppers can compact soil, especially when fields are wet. Compaction limits roots and water movement. Plan traffic patterns, avoid wet conditions and match tire pressure and equipment to the job.

Check for ponding, poor drainage or hard layers. A simple shovel test can show roots and structure.

Fix what you can. Breaking up traffic lanes, limiting passes on wet ground and using wider tires or lower pressure can reduce compaction. Ask your equipment dealer about options that fit your machines.

Simple checks you can do

Dig a few spade-deep holes at set spots each year. Look at root depth, soil color, smell, earthworms and how the soil crumbles. Note how quickly water soaks in after rain.

Take photos and notes each year. Combine them with soil test results and yield records to see change over time.

Compare your observations from year to year in the same spots. Mark the places with flags or a phone map so you return to them. Over several seasons, the pattern will tell you more than any single test.

Grazing, forage stands and animal traffic

On herds that graze, rest periods let plants regrow and keep roots strong. Overgrazing or heavy hoof traffic on wet ground can damage sod, expose soil and cause runoff. Match stocking and paddock moves to forage growth, and ask your grazing or extension adviser for guidance that fits your region.

In confinement systems, heavy use areas near lanes, waterers and feeding pads can erode and collect mud. Stabilize these spots, divert clean water away and keep manure from running toward ditches. Ask NRCS about practices that protect these areas.

Common mistakes and what to ask

A common mistake is expecting fast results. Soil change takes seasons and years. Another is copying a neighbor's practice without testing it on a small field first.

Start small. Trial one new practice on one field, record results and adjust.

Ask about help. NRCS and some state and local programs may share costs for practices that improve soil health, with their own rules and deadlines. Visit your local office early and bring your field maps.

What is the main limit in my worst field?
Which practice fits my equipment and crops?
What cost-share can help me try it?
How will I measure change?

When to get help: Ask your NRCS office or extension agent to help evaluate your soils and cost-share options. Ask your agronomist before changing tillage or crop plans.

Sources and further reading

Organization homepages are linked so you can search them for current guidance on this topic.

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