How to Grow Roundup Ready Soybean

Roundup Ready Soybean

Glycine max

vegetable

Roundup Ready soybeans are genetically modified legumes engineered to tolerate glyphosate herbicide applications, making weed management significantly easier in large-scale agriculture. These high-yield cultivars are among the most widely grown crops globally, used primarily for oil extraction, animal feed, and food products. DuPont Pioneer varieties are bred for consistent performance across diverse climates and soil conditions.

Looking for a specific variety?

P1197AM P1380AM P1494AM P1535AM P1647AM P1748AM

When should you plant Roundup Ready Soybean in your zone?

Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.

Get my Roundup Ready Soybean timeline →

Example Roundup Ready Soybean timeline · Pittsburgh, PA (Zone 6b)

Plant Roundup Ready Soybean
Around Apr 17

Near Pittsburgh's average last spring frost.
Tend & protect
Late spring–summer

Watering, feeding, and pest-watch reminders.
Harvest Roundup Ready Soybean
Around Jul 26

≈ 100 days after planting

Sample dates for Pittsburgh, PA. Sign up to get exact Roundup Ready Soybean dates for your own zip code.

Growing Conditions

☀️

Sun: Full sun, minimum 6 hours daily; 8+ hours optimal for maximum yields

💧

Water: Moderate but consistent; 1.5-2 inches per week during growing season. Critical moisture need during flowering and pod fill (R1-R6 stages). Drought stress during these periods significantly reduces yield.

📏

Spacing: 6-8 inches between plants in rows; rows spaced 15-30 inches apart depending on equipment inches

📅

Days to maturity: 100-130 days (varies by maturity group; DuPont Pioneer offers MG 1.9-3.8 ranges)

🌱

Planting depth: 1-1.5 inches; deeper in dry soils, shallower in wet soils

Soil

Type: Well-draining loamy to clay-loam soil with good organic matter

pH: 6.0-7.5

Amendments:

Phosphorus (P) to support pod development Potassium (K) for plant vigor Inoculant (Bradyrhizobium japonicum) for nitrogen fixation if new to area Sulfur in high-pH soils Boron in deficient soils

Growing Zones

Find your zone →

Ideal in zones 4-7; can extend into zone 3 and 8 with appropriate varieties

3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a

Get my Roundup Ready Soybean timeline →

Growth Stages

Vegetative Emergence (VC-V3)

7-14 days

Seeds germinate and first true leaves emerge; cotyledons and unifoliate leaves visible

Ensure adequate soil moisture for germination. Monitor for seedling diseases (Phomopsis, damping off). Protect from crusting if rainfall compacts soil. Verify herbicide application safety window.

Vegetative Growth (V4-V10)

3-4 weeks

Trifoliate leaves develop in succession; plant establishes node structure; root system expands rapidly

Apply Roundup Ready herbicide (glyphosate) when weeds are actively growing and 1-4 inches tall. Monitor for defoliation pests (Japanese beetles, grasshoppers). Ensure consistent moisture.

Flowering (R1-R2)

1-2 weeks

First flowers appear at upper nodes; flower color varies by variety (typically white, pink, or purple). Plant height stabilizes.

Critical drought period; maintain 1.5-2 inches water weekly. Avoid late-season herbicide applications. Monitor for pod diseases (phomopsis, anthracnose).

Pod Development & Fill (R3-R6)

4-5 weeks

Pods develop and swell with seeds; leaves begin senescence. Plant diverts energy to seed development. Pods change from green to tan.

Most critical growth stage for yield; maintain adequate moisture. Reduce or cease foliar disease sprays to avoid harvest delays. Monitor for pod-feeding insects (bean leaf beetles, stink bugs).

Maturity & Harvest (R7-R8)

2-4 weeks

Pods dry completely; leaves defoliate; seeds reach 12-13% moisture content and rattle in pods. Plant turns tan/brown.

Cease irrigation. Allow pods to dry completely before harvest (typically 2-4 weeks after R7). Harvest when moisture reaches 12-15% for optimal quality and minimal loss.

Companion Planting

Plan your garden →

Plant with:

Corn (in rotation or intercropping systems) Oats (rotation crop) Winter wheat (rotation crop) Alfalfa (rotation for nitrogen replenishment)

Avoid planting near:

Other susceptible legume crops in consecutive years without rotation Non-Roundup Ready soybeans (cross-pollination/volunteer concerns) Soybean cyst nematode-infested fields (practice rotation)

Common Pests

Rotate to resistant varieties; practice 2-3 year rotation with non-host crops; use nematode-resistant cultivars; crop rotation is most effective
Tolerate light defoliation during vegetative stages; monitor R1-R5 stages; insecticides only justified for heavy economic damage; parasitoid wasps provide natural control
Early-season foliage damage rarely warrants treatment; monitor pod-stage populations; insecticides if economic threshold reached
Monitor during R3-R6; insecticide application only if threshold of 3+ bugs per 50 sweeps; damage more severe in late-planted fields
Use resistant varieties; plant pathogen-free seed; avoid late planting; timely harvest; crop rotation
and (Colletotrichum/Diaporthe spp.)
Select resistant cultivars; remove crop residue; crop rotation; fungicide seed treatment; avoid overhead irrigation

Uses

🍳

Edible Oil and Food Products

Culinary

Soybean oil is extracted for cooking oils, margarine, and processed foods. Soybeans are processed into tofu, tempeh, soy milk, soy sauce, and protein-enriched food products globally. [source]

🍳

Animal Feed and Livestock Nutrition

Culinary

Soybean meal is the most economical protein source for poultry, swine, and cattle feed, providing essential amino acids. Typically comprises 40-50% of livestock feed formulations worldwide. [source]

🏠

Industrial and Biodiesel Production

Household

Soybean oil serves as feedstock for biodiesel fuel, bioplastics, inks, lubricants, and cosmetics. Supports renewable energy and bio-based industrial applications. [source]

💊

Phytoestrogen and Health Compounds

Medicinal

Soybeans contain isoflavones and genistein, compounds studied for effects on bone health, menopause symptoms, and cardiovascular function in human nutrition. [source]

🏠

Nitrogen Fixation and Soil Health

Household

Symbiotic Rhizobium bacteria nodulate roots to fix atmospheric nitrogen, improving soil fertility naturally and reducing synthetic fertilizer needs in rotational systems. [source]

This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.

Harvest Tips

Harvest when pods are completely dry and seeds rattle freely inside (R8 stage, 12-15% seed moisture). Use combine harvester with header adjusted for row spacing and height. Harvest in morning when dew has dried to reduce shatter losses. Allow field to dry completely to 12-13% moisture before storage to prevent mold and preserve oil quality.

Fun Facts

🌱 Roundup Ready soybeans revolutionized weed management when introduced in 1996, allowing farmers to apply glyphosate herbicide post-emergence without crop damage—making DuPont Pioneer one of agriculture's most commercially successful GMO crops.
🌱 A single soybean plant can produce 50-100 pods, with each pod typically containing 2-3 seeds that can yield up to 50 bushels per acre under optimal conditions.
🌱 Soybeans are nitrogen-fixing legumes that enrich soil; rotating them with corn reduces synthetic fertilizer requirements and maintains soil health, making them a cornerstone of sustainable agricultural systems.

Gardening Terms

New to gardening? Learn about terms used in this guide:

Cultivar Damping Off Full Sun Germination pH True Leaves

Shop Roundup Ready Soybean plants and related plants at Plant Addicts →

Join 30,000 gardeners planning their gardens with LizPlants.

Get your personalized Roundup Ready Soybean planting timeline

Tell us your zip code and we'll calculate exactly when to start Roundup Ready Soybean seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.

Get my Roundup Ready Soybean timeline →