How Much Winter Wheat Seed Per Hectare? A Practical Guide
Forget the universal number. Real seeding rate depends on four things, and none of them are printed on the bag. Here is how to figure out yours.
Walk into any co-op around planting time and somebody will throw out a number like "180 kg per hectare" and move on. That number is about as useful as last year's weather report.
The real answer? Seeding rate depends on four things. None of them are printed on the bag.
The Four Things That Actually Matter
Before the drill goes in the ground, figure out:
- When the crop is being planted. Early sowing wakes up tillering. Late doesn't.
- The weight of the seed. The 1000-kernel weight on the tag matters way more than people realize.
- How many plants are wanted at harvest. Most growers aim for 350 to 450 healthy heads per square meter.
- Honest losses. Some seed isn't going to make it. That's just farming.
The formula:
Seed rate (kg/ha) = (target plants per m² × kernel weight in grams) ÷ (10 × germination % × emergence factor)
A neighbor's number is for a neighbor's field. It probably doesn't fit yours.
How Many Plants To Aim For
A quick reference table:
| When you plant | Plants per m² you want |
|---|---|
| On time | 250 to 300 |
| A bit late | 350 to 400 |
| Really late | 400 to 500 |
When wheat goes in early, it tillers heavily and fills out thin spots on its own. Plant it late, and tillering can't do the work. Compensation comes from seed. Simple as that.
When To Plant Winter Wheat
The old rule was "plant after the Hessian fly date." Still works in areas with fly pressure. Where there isn't any, the working rule is to count back 45 to 55 days from when the ground usually freezes (below about 4°C). That gives the crop time to grow three tillers before winter. Three tillers is roughly the magic number for surviving the cold.
Too early? Excessive fall growth, then snow mold and disease problems come spring.
Too late? Wheat enters winter weak and might not make it through.
The Seed Weight Trick Most People Skip
Cleaned, certified seed lots weigh anywhere from 32 to 48 grams per 1000 kernels. At the same target plant population, the heavier seed needs about 50% more kilograms per hectare.
Yeah. 50%. That is not a typo.
Weigh a sample of the actual lot before drilling. The label is a starting point, not the truth.
How Much Seed Actually Comes Up
In moist soil at 2.5 to 3 cm depth, expect 80 to 90% of the seed to emerge. In cloddy, dry, or hard-packed ground, more like 55 to 70%.
Bad seedbed? Throwing more seed at it does not help. Fix the seedbed. Extra seed in junk ground gives a thin stand with weak roots. It is wasted money, and yield drops anyway.
A Worked Example
Real numbers, plugged into the formula:
- Target: 320 plants/m²
- Seed weight: 42 g per 1000
- Germination on the bag: 95%
- Emergence factor (decent seedbed): 0.80
Math:
(320 × 42) / (10 × 95 × 0.80) = 177 kg/ha
Drilled at 2.5 cm into firm, moist soil, the stand comes up where it should.
Three Mistakes That Quietly Wreck Stands
Even with the math right, three things trip people up.
Volunteer cereals. If last year's wheat or barley was not killed cleanly, the volunteers show up in the count and make the seeding rate look fine. Walk the rows at three-leaf stage. Count only the drilled rows.
Slugs. No-till fields with heavy residue can lose 20 to 30% of seedlings to slugs in a single week. Scout right after emergence. If slugs are there, act fast.
Worn drill openers. Old drills get sloppy. Actual rate can be off by 5 to 15% without anybody noticing. A static catch test every spring takes 30 minutes and saves the stand.
Frequently Asked Questions
What is the average seeding rate for winter wheat?
Most growers use 150 to 200 kg per hectare depending on planting date and seed size. The right number for a given field comes from the formula above.
Can you just plant more seed to be safe?
You can. But stands above 500 plants per m² actually yield less. The plants compete and head smaller. More is not always better.
What if planting is late?
Bump the target to 400 to 500 plants/m² and skip varieties with slow tillering. Plant deeper, 3 to 4 cm, so the crown sits below frost depth.
Does seed weight really matter that much?
Yes. A heavy lot at the same kg rate gives a thin stand. A light lot gives a thick one. Always calibrate to the actual 1000-kernel weight, not the label.
How deep should winter wheat be planted?
2.5 cm in moist conditions. 3 to 4 cm if the soil is dry or sowing is late. Deeper than 4 cm and emergence drops fast.
So What Is The Real Answer?
Forget the universal number. Ten minutes with the formula, the seed tag, and the planting date. That gets a stand right. Next year, run the numbers again. Seed lot, weather, and seedbed change every season.