Crop Spraying in Fillmore County, MN by Drone for Corn and Soybeans

Crop spraying prices in Fillmore County

Crop spraying in Fillmore County, MN by drone is priced per acre, per pass, application only. Minnesota drone rates run $10–20 per acre for corn, soybeans, wheat and hay, with $14 as the typical 2026 figure. Our rates:

Service	Typical rate	Notes
Cover crop seeding	from $12/acre	Rye, oats into standing crops
Post-emerge herbicide	from $13/acre	Waterhemp, giant ragweed
Corn and soybean fungicide	from $13/acre	Tar spot, white mold
Insecticide	from $13/acre	Soybean aphid, alfalfa pests
Hay and pasture weed control	from $15/acre	Steep ground, small fields

Fields under 25 acres are billed as 25 acres. Sinkholes, trout-stream setbacks, contour strips and timber edges add flight planning, which the quote shows up front. Product is billed separately or supplied by your co-op.

Fillmore County farming by the numbers

Fillmore County ranked 19th in Minnesota for farm sales in the 2022 Census of Agriculture, at about $520 million, with 65% from crops. The county also ranks 17th in the state for milk sales and carries about 61,000 cattle and 135,000 hogs.

Crop	2022 acres
Corn for grain	182,006
Soybeans	117,291
Forage and hay	33,931
Corn silage	8,120
Oats	2,785

More than 10,000 sinkholes

Fillmore County sits in Minnesota's Driftless Area, where limestone lies just under the soil. The county has more than 10,000 sinkholes, some as deep as 100 feet, and the town of Fountain is said to have more sinkholes than residents. Mystery Cave and Niagara Cave are part of the same karst system.

Sinkholes are direct paths from a field to groundwater, so crop spraying in Fillmore County needs care that flat-county operators rarely think about:

1. Map sinkholes, springs and wells as no-spray zones before the flight.
2. Keep wider buffers on field edges that drain into a sinkhole.
3. Never mix or rinse near a sinkhole or wellhead.
4. Use coarse droplets and low flight height near these features.

A drone also never drives near a sinkhole edge, which is a real hazard for heavy equipment.

Nitrate, groundwater and timing nitrogen

In April 2023, groups petitioned the U.S. EPA over nitrate in drinking water across eight southeast Minnesota karst counties, including Fillmore, and EPA asked the state for a response plan. Minnesota's Groundwater Protection Rule already restricts fall nitrogen (after September 1) and application on frozen soil in vulnerable groundwater areas, which include karst and shallow bedrock.

Drones help farms work within those rules:

• In-season nitrogen top-dress on growing corn, applied when the crop can use it.
• Cover crops seeded earlier into standing soybeans and corn, so living roots take up leftover nitrate in fall.
• Application records that document what went on each field and when.

Root River and trout-stream buffers

The North, Middle and South branches of the Root River and many smaller streams, such as Trout Run, are designated trout streams under Minnesota rules. Steep valleys drop from cropland straight to the water. Operators map every stream, ditch and spring with the buffers each label requires and fly only when wind blows away from the water.

Field condition	Ground sprayer	Spray drone
Contour strips on steep slopes	Slow, rollover risk	Follows terrain
Fields above trout-stream valleys	Hard edges	Mapped buffers
Wet ground after a storm	Ruts	No soil contact
Tall corn at tassel	Limited clearance	Flies above the canopy

Tar spot, white mold and soybean aphid

Tar spot arrived in Minnesota in 2019, and in 2022 University of Minnesota Extension reported it in southern Fillmore County on June 29, unusually early. Fungicide at VT–R2 protects the ear leaf. In soybeans, white mold builds in humid river valleys and is managed with fungicide at R1–R3, and soybean aphid is treated when counts reach 250 per plant and are rising.

Alfalfa and oats on dairy farms

Dairy and beef farms here grow nearly 34,000 acres of hay and haylage plus oats as a nurse crop for new alfalfa seedings. Alfalfa weevil is treated before first cutting when tip feeding reaches threshold, and potato leafhopper on regrowth after the first and second cuttings. On steep hay ground, a drone avoids the rollover risk of a tractor sprayer.

Amish farms and neighbors

Amish communities around Harmony, Canton and Preston farm next to many larger corn and soybean fields. Operators map gardens, pastures and homes as no-spray zones, keep flights short and predictable near roads with horse-drawn buggies, and only fly when wind blows away from neighboring farms.

Minnesota rules for drone application

The Minnesota Department of Agriculture (MDA) requires commercial drone applicators to pass Category A (Core), Category B (General Aerial, renewed every year) and Category C (Field Crops). The MnDOT Office of Aeronautics requires each drone to be registered with the state and the business to hold a UAS Commercial Operations License with proof of insurance. The FAA requires Part 107, Part 137 and a Section 44807 exemption for drones over 55 pounds.