Nutrient Management Planning

A nutrient management plan is a written plan for how manure and fertilizer will be used on each field. It protects water, saves money and is often required by law or by programs.

Key points

A plan matches manure and fertilizer to crop needs and protects water.
Requirements vary by state and farm size, so check locally.
Soil tests, manure analysis and field maps are the foundation.
Calibrate spreaders and record every application.
Review and update the plan each year.

What the plan covers

A plan lists your fields, soil test results, planned crops, expected yields and the nutrients crops need. It then shows how much manure and fertilizer will be applied, when and by what method, and where applications must be avoided.

It also covers manure storage, record keeping and setbacks from streams, wells and ditches. The goal is to feed the crop while keeping nutrients on the field and out of water.

Plans differ by state, and the name may differ too. Some places call them comprehensive nutrient management plans, and some tie them to permits for larger farms. Ask your agency which type applies and who can approve it.

Think of the plan as a budget for nutrients, with the same logic as a farm budget. You list what comes in, what the crops take out and what is left over, and you adjust before the leftovers become a problem.

Why it matters

Nitrogen and phosphorus that leave a field can harm streams, lakes and groundwater. Over-applying nutrients wastes money and can raise risks for neighbors and the farm.

Many states require plans for farms of certain sizes or in certain situations, and milk buyers and programs may ask for one. Rules vary, so check with your state agriculture or environmental agency and your NRCS office.

Good planning also supports your neighbors and your milk buyer. When a program or inspector visits, a current plan and a clean set of records show that the farm takes stewardship seriously. That helps protect your reputation and your right to farm.

Information you need to gather

Start with a map of every field, including slope, soil type, drainage and nearby water. Collect recent soil test results taken in the way your lab recommends, manure analysis from each storage and crop rotation history.

Know your storage capacity and how much manure the herd produces across the year. Keep records of past applications and yields.

Think about feed too. Purchased feed brings nutrients onto the farm, and ration choices change what ends up in the manure. Your nutritionist can help you see how feeding decisions affect nutrient balance.

Field maps and soil types
Soil tests
Manure test results
Crop rotation and yields
Storage capacity and herd size
Distance to wells and surface water

Planning applications

Match applications to what the crop will use and when it can use it. Avoid spreading on frozen, snow-covered, saturated or steeply sloped ground, and ahead of heavy rain. Calibrate your spreader so the rate you plan is the rate you apply.

Credit nutrients that come from legumes and previous manure. Use fields with low soil test phosphorus first and keep high-testing fields on hold when your plan says so.

Think about timing and storage together. If storage is nearly full going into winter, the temptation to spread on poor ground rises. Plan ahead, empty storage when conditions are good and keep an eye on the forecast before every application.

Record keeping and updates

Write down the date, field, rate, source, method and weather for every application. Keep calibration records and test results. Plans need updating when crops, herd size, soil tests or rules change.

Many states require plans to be written or reviewed by a certified planner. Ask your extension office who is certified near you.

Share the plan with the people who do the work. The employee who drives the spreader should know the field limits, the rates and the setbacks. A one-page field summary in the cab helps prevent mistakes.

Common mistakes and what to ask

Common mistakes include relying on old soil tests, skipping manure analysis, guessing spreader rates and treating the plan as paperwork that sits on a shelf.

A good plan is a working tool. Review it every year with your planner, agronomist and nutritionist, since feed changes also affect manure nutrients.

Keep the plan, test reports and application logs in one folder that is easy to hand over during an inspection or a program visit. Back them up so a lost notebook does not leave you without records.

Who is a certified planner near me?
Are my soil and manure tests current?
Is my spreader calibrated?
What are my setbacks and timing rules?
When will we review the plan?

When to get help: Contact your NRCS office or state agency to learn plan requirements and certified planners. Ask your nutritionist how ration changes affect manure nutrients.

Sources and further reading

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

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