Food plot soil test kits: what to buy and how to read them

Last updated 2026-07-25

what is a food plot soil test kit, exactly

A food plot soil test kit is any tool that measures pH and nutrient levels in the dirt before you plant. That covers two very different things: the $10 to $25 probe or capsule kits sold at farm stores, and the mail-in lab test kits sold through university extension offices, usually for $8 to $20 per sample depending on the state and what package you order ^[1]. The cheap kits give you a color chart. You mix soil with a reagent, watch it turn some shade of green or pink, and match it to a card. It's roughly like using a home pregnancy test to diagnose a hormone level. You get a ballpark. Lab tests use actual instrumentation, usually a pH meter and a Mehlich or Bray extraction for phosphorus and potassium, and they hand you real numbers: pH to a tenth of a point, P and K in pounds per acre or ppm ^[2]. For food plots specifically, the lab test matters more than most gear on your truck. Whitetails don't care if your drill is new. They care whether your clover or brassica plot actually grew, and that comes down to pH and fertility more than seed choice. Purdue Extension's food plot guidance puts it plainly: a soil test is the starting point for any planting decision, not an afterthought ^[3].

are drugstore probe kits worth buying at all

For a first-year plot on ground you've never worked, a probe kit is fine as a gut check. It'll tell you if you're sitting on a pH of 4.8 versus 6.5, and that's a real difference worth knowing before you drive to the co-op. Where probe kits fall short is precision on phosphorus and potassium. Most food plot failures trace back to pH, not P or K, so this matters less than people think. But if you're trying to decide between 200 and 400 pounds of 0-20-20 per acre, a color-match kit can't tell you that. A lab test can. My honest take: spend the $12 to $20 and mail a sample to your state extension lab before you spend $150 on seed and fertilizer. It's the cheapest insurance in the whole food plot budget. Skipping the lab test to save $15 and then guessing on lime is like buying a $600 spreader and never calibrating it.

how do i actually collect a soil sample for a food plot

Pull 8 to 12 cores per plot from the top 6 to 8 inches of soil, mix them in a clean plastic bucket (never galvanized metal, it skews zinc readings), and pull one composite sample from that mix ^[2]. Do this at least 2 to 3 months before planting so lime has time to work if you need it. Walk a zigzag pattern across the plot instead of grabbing dirt from one corner. Soil pH can swing half a point or more across a quarter-acre plot, especially on ground that's been limed unevenly in the past. If your plot has an obviously different section, wet low ground versus a dry ridge, sample it separately. Let the soil air dry before boxing it up if your extension lab asks for that (most do). Wet samples can mold in the mail and some labs will reject them. Label the bag with the field name matching what you write on the submission form. Sounds obvious, it's the number one reason people get confused results back.

how much lime and fertilizer does my food plot actually need

That's exactly what the lab report tells you, and it's site specific enough that no article can give you a real number. Your soil test lab is the actual authority here, not a blog post. Most reports come back with a recommendation in tons of lime per acre and pounds of N-P-K per acre for the specific crop you tell them you're planting. As a general range, food plot soil in the eastern and midwestern US often needs somewhere between 1 and 3 tons of ag lime per acre to bring acidic ground up to the 6.0 to 6.8 range clover and brassicas want ^{[3] [4]}. Some ground needs none. Some needs more. That's the whole point of testing instead of guessing. Fertilizer needs vary even more by crop. Legumes like clover fix their own nitrogen once inoculated, so they need P and K but almost no N. Brassicas like turnips are heavy nitrogen feeders. A soil test paired with your planting plan (something a custom food plot plan covers for $99 one-time) tells you the actual pounds per acre to buy instead of eyeballing a bag at the store.

when should i plant food plots for deer

Timing depends entirely on what you're planting and your region, but the two big windows are late summer to early fall for annual food plots (most of the country) and spring for perennial clover and chicory establishment ^{[5] [6]}. For fall annuals like brassicas, oats, and cereal grains, most extension guidance points to planting 6 to 10 weeks before your area's first hard frost, which lets plants establish before cold slows growth ^[5]. In the upper Midwest that's often late July through August. In the South it can stretch into September or even October. Perennial clover establishes best in spring (March through May in much of the whitetail range) or in late summer alongside your fall annuals, timed so it germinates before frost but after summer heat breaks ^[6]. Check your local frost dates through your state's cooperative extension office rather than a national calendar. A frost date in northern Minnesota and coastal Alabama can be two months apart.

when to plant oats for deer

Plant oats 6 to 8 weeks before your first fall frost in most of the whitetail range, which usually lands in August or early September depending on latitude ^[5]. Oats are a cool-season annual grain, cheap, fast-germinating, and reliably attractive to deer in the first 60 days after planting. They're not a great standalone perennial plot crop since they winterkill in most zones, but they work well mixed with clover or brassicas as a nurse crop, coming up fast to hold soil and give deer something to eat while slower species establish. Oats also tolerate a wider pH range than clover, generally growing acceptably down to about 5.5, so they're a reasonable choice on ground you haven't limed yet ^[4].

when to plant turnips for deer

Turnips go in the ground roughly 60 to 90 days before your first expected hard frost, which for most of the whitetail range means late July through early September ^{[5] [7]}. Turnips are a brassica, and brassicas need that window because they're bred to get hit by frost. Cold actually converts starches to sugars in the bulb and leaves, which is why deer often ignore turnip plots in September and hammer them in December. Don't plant turnips too early in hot climates. Extension guidance from several southern states notes that brassicas seeded into summer heat above roughly 85 degrees F soil temperature can struggle to germinate evenly ^[7]. Wait for the first real cool snap, even if that pushes you into early September.

do deer eat sorghum

Yes, deer eat grain sorghum, primarily the seed heads once they mature, and it's a legitimate food plot and standing-crop option in warmer regions, but it's not near the top of their preference list compared to soybeans, clover, or acorns ^[8]. It's more commonly planted as a screening or bedding cover crop, or as supplemental fall/winter grain, than as a primary attractant plot. Sorghum tolerates drought and poor soil better than most food plot species, which is why it shows up in southern and Great Plains plot mixes. If your main goal is drawing deer to a stand location, sorghum is a weaker pick than brassicas or clover. If your goal is late-season standing grain and cover in dry ground, it's worth a spot in the mix.

do deer eat clover, and do deer actually like it

Yes, and it's close to the most consistently preferred food plot forage across the whitetail's range. White clover and red clover show up in nearly every extension and state wildlife agency food plot guide as a top perennial choice because deer eat it heavily spring through fall and it handles repeated grazing better than almost anything else you can plant ^{[9] [6]}. Clover's real advantage isn't just palatability, it's protein. Extension research puts whitetail-grade clover forage in the 25 to 30% crude protein range when it's actively growing, which matters most in spring and summer for antler growth and lactation ^[6]. That's higher than most standing grain crops. The tradeoff is establishment. Clover needs decent pH (6.0 to 6.8), needs the seed inoculated with the right rhizobium bacteria if it hasn't been in that field before, and it's slower out of the ground than oats or brassicas. If you want fast tonnage in 60 days, clover isn't it. If you want a plot that comes back for 3 to 5 years with minimal replanting, it's hard to beat.

what are deer's favorite food plot foods, overall

There's no single official ranking, but state wildlife agencies and extension services consistently list the same handful of species at the top: soybeans, clover, and acorns lead most preference studies, with brassicas (turnips, radishes) and chicory close behind depending on season ^{[8] [9]}. Deer preference also shifts hard by season. In summer they lean toward soybeans and clover for protein during antler growth and lactation. In fall, acorns and standing grain take over when available, because deer prioritize fat and carbohydrates ahead of winter. In late winter, frost-sweetened brassicas and any leftover standing beans become some of the only green forage left, which is why they get hammered in January even though deer ignored them in October. If you're planning a single plot to cover the most months, a clover base with a fall brassica plot nearby covers spring through winter better than any one species alone. That's the logic behind most food plot whitetail rotation plans and most state agency plot guides.

do deer like honey, and does it matter for food plots

There's no real research or extension guidance suggesting honey plays any role in deer nutrition or food plot attraction, and it's not a product used in any plot mix. Deer are herbivores built around fermenting plant fiber in a rumen; a sugary substance like honey isn't part of their natural diet or foraging behavior. Some hunters use sweet liquid attractants (molasses-based sprays, sugar beet products) as scent or mineral supplements near a plot, and deer will sometimes investigate those out of curiosity or for the sugar content. But that's a mineral station or attractant question, not a food plot question, and it's worth checking your state's baiting and feeding rules before using any supplemental attractant, since bait and feed restrictions vary widely and some states classify mineral or scent products as bait.

what is a food plot, and why does the soil test matter more than the seed bag

A food plot is a planted area, usually a fraction of an acre up to several acres, seeded with forage species specifically to feed and attract deer on land you hunt or manage. It's different from a crop field in that the goal is deer nutrition and hunting opportunity, not harvest for sale. The seed bag gets all the marketing attention, but soil chemistry decides whether that seed grows. A University of Tennessee Extension food plot publication states the sequence plainly: test soil, correct pH and fertility based on the results, then select and plant seed suited to the site ^[4]. Skip step one and step two, and even the best seed blend on the market can fail on soil sitting at pH 5.0, since most food plot legumes and brassicas struggle to take up phosphorus properly below pH 5.5 to 6.0 ^{[3] [4]}. This is really the whole argument for spending $15 on a real lab test before you spend $150 to $300 on seed, lime, and fertilizer for an acre plot. If you want help turning a soil test result into an actual planting and fertilizer plan by species and zone, that's exactly what a custom food plot plan is built to do for $99 one-time, though your soil test lab's specific lime and fertilizer numbers are still the final word for your ground.

which soil test option should you actually buy

Option	Typical cost	What you get	Best use
Drugstore probe/capsule kit	$10-$25	Color-match pH, rough N-P-K	Quick gut check, no lab wait
State extension mail-in test	$8-$20 per sample	Lab-measured pH, P, K, lime/fertilizer recommendation	Actual plot planning, most accurate value
Private ag lab test	$15-$40 per sample	Same as extension, often faster turnaround, sometimes micronutrients	Larger operations, multiple plots	For one or two plots, the state extension route wins on cost and reliability every time. Turnaround is usually 1 to 3 weeks depending on the state and season (spring is their busy season, so results can lag). If you need results in days, a private ag lab costs more but often ships faster. Whatever you pick, resist the color-chart-only kits for anything beyond a first-pass gut check. They're not built to guide a fertilizer purchase, and guessing wrong on lime is the single most common reason a food plot underperforms in year one [3].

Frequently asked questions

Do deer eat sorghum?

Yes. Deer eat grain sorghum seed heads once they mature, and it works as a drought-tolerant plot or standing winter grain option, especially in the South and Great Plains. It ranks below soybeans, clover, and acorns in most preference data, so it's usually a secondary plot species rather than a primary attractant ^[10].

Do deer like clover, and is it worth planting?

Yes, clover is one of the most consistently preferred food plot species across whitetail range and offers 25-30% crude protein when actively growing ^[8]. It needs pH 6.0-6.8 and proper inoculation to establish well but can produce for 3-5 years with minimal replanting once it's going.

When should I plant food plots for deer?

Fall annuals (oats, brassicas, cereal grains) go in 6-10 weeks before your area's first hard frost, often late July through September. Perennial clover establishes best in spring (March-May) or late summer. Check your local frost date through your state cooperative extension rather than a national calendar ^[7][8].

When to plant oats for deer?

Plant oats 6-8 weeks before your first fall frost, usually August or early September in most whitetail range ^[7]. Oats germinate fast, tolerate lower pH than clover (down to about 5.5), and work well as a nurse crop mixed with clover or brassica seed.

When to plant turnips for deer?

Plant turnips 60-90 days before your first hard frost, generally late July through early September ^[7][9]. Frost actually improves them, converting starches to sugars, which is why deer often ignore turnip plots early and hit them hard after the first freeze in late fall or winter.

What is a food plot?

A food plot is a planted patch, from a fraction of an acre to several acres, seeded with forage like clover, brassicas, or beans specifically to feed and attract deer on hunted or managed land. Unlike a farm crop, the goal is deer nutrition and hunting opportunity, not harvested yield.

What are deer's favorite foods overall?

Soybeans, clover, and acorns consistently rank at the top across state agency and extension preference data, with brassicas and chicory close behind depending on season ^[10][11]. Preference shifts seasonally: protein-heavy soybeans and clover in summer, acorns and grain in fall, frost-sweetened brassicas in late winter.

Do deer like honey?

There's no research or extension guidance showing honey plays any role in deer diet or food plot attraction. Deer are herbivores that ferment plant fiber, not sugar-seekers. Some hunters use molasses-based liquid attractants near plots, which is a separate bait/attractant question, not a food plot question, and subject to state baiting rules ^[12].

How much does a food plot soil test kit cost?

Drugstore probe kits run $10-$25. Mail-in lab tests through state extension offices typically cost $8-$20 per sample, and private ag labs run $15-$40 ^[1][2]. For real fertilizer and lime decisions, the lab test is worth the extra few dollars over a color-match probe kit.

How deep should I sample soil for a food plot test?

Pull cores from the top 6-8 inches of soil, take 8-12 cores across the plot in a zigzag pattern, mix them in a plastic bucket, and submit one composite sample ^[3][5]. Sampling only one spot or using metal buckets can skew your results, particularly for pH and zinc.

How long before planting should I test my food plot soil?

Test 2-3 months before your planting date if possible. Lime takes time to react with soil and raise pH, sometimes 3-6 months for full effect, so testing early gives lime a chance to work before seed goes in the ground ^[4][6].

Can I use a home garden soil test kit for a food plot?

Yes, the same probe or capsule kits sold for garden beds work fine as a rough check on food plot ground. They're not precise enough to size a fertilizer purchase accurately, so treat them as a first pass, then confirm with a lab test before spending money on lime and fertilizer.

Sources

1. Penn State Extension, Agricultural Analytical Services Lab fee schedule: state extension soil test pricing typically falls in the $8-$20 per sample range
2. University of Missouri Extension, Soil Testing (G9112): proper soil sampling depth, coring method, and use of plastic (not metal) containers
3. Purdue University Extension, food plot and wildlife habitat soil fertility guidance: soil testing is the starting point for food plot planting decisions and pH affects nutrient uptake
4. University of Tennessee Extension, Wildlife Food Plots publication (PB1743/SP731): sequence of test soil, correct pH/fertility, then plant; brassica and legume pH requirements
5. Mississippi State University Extension, Establishing Fall Food Plots for Deer: fall annual food plot planting windows relative to first frost date
6. University of Tennessee Extension / Noble Research Institute, clover forage protein content and establishment timing: white and red clover crude protein range of roughly 25-30% and spring/late-summer establishment timing
7. Clemson Cooperative Extension, Brassicas for Deer Food Plots: brassica planting window 60-90 days before frost and germination issues in high soil temperatures
8. Mississippi State University Extension, deer food preference and forage species ranking: soybeans, clover, and acorns rank among top preferred whitetail food sources, sorghum as secondary species
9. Texas Parks and Wildlife Department, White-tailed Deer Food Habits: clover and legumes ranking among preferred whitetail forages by state wildlife agency data