Sugar beets are sown in early spring 4-6 weeks before the last frost, about 1 inch deep, in rows 18 inches apart with 4-6 inches between plants, and harvested in fall after a 90-100 day season. Those spacings put 58,000-87,000 plants on an acre, so roots of 3-5 lb would weigh 87-218 tons, not the 15-25 tons the same guide states; the root size or the spacing is wrong.
Growing sugar beets at scale is the cultivation of the sugar beet root crop on enough ground to supply a community’s sugar, from sowing in early spring to harvest in fall.
Early Sowing And A 90-100 Day Season Set The Calendar
The sugar guide gives these conditions: a cool temperate climate, similar to growing carrots or turnips; deep, loose, well-drained, moderately fertile soil; sowing in early spring 4-6 weeks before the last frost, 1 inch deep, 4-6 inches apart in rows 18 inches apart; a 90-100 day growing season; harvest in fall when roots reach 3-5 lb; a yield of 15-25 tons of beets per acre under favourable conditions; and roots with 12-20% sucrose.
Worked Example: The Figures Do Not Fit
An acre is 43,560 square feet, or 6,272,640 square inches (43,560 × 144).
- Space per plant at 18 inches by 4 inches: 72 square inches. At 18 by 6: 108 square inches.
- Plants per acre: 6,272,640 ÷ 72 = 87,120 and 6,272,640 ÷ 108 = 58,080. That is 58,000-87,000 plants an acre.
- If each root weighed 3-5 lb, the acre would hold 58,080 × 3 = 174,240 lb, 87 tons, up to 87,120 × 5 = 435,600 lb, 218 tons (dividing by 2,000 lb per ton).
- The guide’s yield is 15-25 tons, which is 30,000-50,000 lb. Spread over 58,080-87,120 plants, that is 0.34-0.86 lb per root.
- Conversely, 15-25 tons in roots of 3-5 lb would be only 6,000-16,700 roots an acre (30,000 ÷ 5 = 6,000; 50,000 ÷ 3 = 16,667), which means each plant has about 376-1,045 square inches (6,272,640 ÷ 16,667 = 376; ÷ 6,000 = 1,045), far more room than 18 by 4-6 inches.
So at least one of the three figures (spacing, root size, yield) is wrong. The yield is the figure the rest of the sugar guide depends on, so this page uses 15-25 tons as the working number and treats the 3-5 lb root size as the likely error, because roots at the stated spacing cannot be that large. Measure your own: weigh a sample row’s roots and count the plants.
What The Land Is No Longer Doing
An acre of beets is an acre not in grain, roots or legumes. For comparison, the caloric guide’s potatoes give 2.8-5.25 million kcal per acre and wheat 1.2-2.3 million. The beet acre’s sugar is quantified in Yield per Acre; the tops and pulp return some feed to livestock.
What You Need
- Deep, loose, well-drained soil of moderate fertility (Soil Fertility, Soil Texture)
- Seed (Seed Bank Management)
- A rotation slot, since beets belong to a crop family with its own pests (Crop Families and Rotation Logic)
- Labour for thinning and a harvest that lifts roots whole
Method: Grow The Crop
Step 1: Prepare a deep, loose seedbed. Step 2: Sow in early spring, 4-6 weeks before the last frost, 1 inch deep. Step 3: Thin to the spacing you measured to give the root size you want. Step 4: Weed and water as the season requires. Step 5: Harvest in fall by pulling or forking out carefully; remove the tops (feed to livestock). Step 6: Weigh a sample and compute your own yield and plants per acre.
Common Mistakes
- Crowding. Too many plants make small roots.
- Sowing too early. A hard frost on seedlings can ruin the stand; the guide’s sowing time is before the last frost, so protect the plot.
- Damaged roots at harvest. They rot in store.
What’s Next
- Learn next: Extraction by Boiling and Pressing — what happens to the roots
- Combine with: Planting and Harvest Windows — setting dates for your site