Agronomy

Soybean Agronomy

Answers on planting, disease, in-season scouting and harvest for PURIS soybeans, plus seeding rates by variety.

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Planting
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Planting

When should I plant?

When soil temperature at 2 inches reaches 50°F or higher. Planting into soils below about 60°F slows emergence and raises Pythium and Phytophthora risk, so avoid planting just ahead of a cold, wet stretch.

What seeding rate should I use?

140,000–160,000 seeds/acre for large-seeded varieties. Small-seeded varieties run higher, up to 205,000 seeds/acre. See the variety table for rates by variety.

How deep and how wide?

Plant 1–1.75 inches deep in 10–20 inch rows.

Which variety fits a tough field?
  • High-pH or iron chlorosis (IDC) ground: PS122 or PS151.
  • White mold pressure: PS179 or PS101.
  • SDS-prone fields: PS267, PS315, PS322 or PS340.
  • Dryland or variable moisture: PS224, PS315 or PS179.

SOYBEANS: PLANTING RATE BY PLANTER

Variety RM Seed size Seeds/lb 15–20 in rows (seeds/ac) Drilled (seeds/ac) Best fit
PS101 0.9 Large 2,500 155,000–170,000 180,000–190,000 White mold, early acres
PS102 1.3 — 2,600 155,000–170,000 180,000–190,000 Low volume; likely to retire
PS122 1.2 Small 4,800 185,000–200,000 185,000–205,000 High pH, IDC; natto
PS135 1.3 Small 4,800 180,000–200,000 180,000–205,000 Northern, early
PS146 1.4 Small 4,800 175,000–190,000 180,000–200,000 Variable conditions
PS151 1.5 Medium 4,000 165,000–175,000 175,000–185,000 High pH, IDC; natto
PS166 1.6 Medium 2,800 160,000–170,000 170,000–185,000 Yield-focused
PS169 1.7 Medium 2,500 160,000–165,000 170,000–180,000 Late Group 1
PS179 1.8 Large 2,300 150,000–160,000 170,000–180,000 White mold, drought
PS224 2.2 Medium 2,500 140,000–155,000 165,000–170,000 Dryland
PS252 2.5 Large 2,500 140,000–165,000 160,000–180,000 Food grade, low LOX
PS261 2.6 Medium 4,100 160,000–170,000 170,000–185,000 Diverse soils
PS267 2.6 Large 2,500 140,000–165,000 165,000–175,000 SDS
PS283 2.8 Large 2,232 140,000–160,000 160,000–175,000 Challenging soils
PS315 3.1 Large 2,240 140,000–160,000 165,000–175,000 SDS, limited moisture
PS322 3.2 Large 2,550 140,000–165,000 170,000–180,000 SDS, food grade, low LOX
PS340 3.4 Large 2,500 140,000–165,000 170,000–180,000 High yield, food grade

Ratings are 1–5 (1 = excellent). Data is from the 2026 Seed Guide.

Chris Werth, PURIS

Talk to an agronomist

Have a question these pages don't answer? Contact Chris Werth, PURIS agronomist, at cwerth@purisfoods.com or (952) 207-4478, or send us a note and we'll get back to you.

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