A Rapeseed brassica cover crop is an upright, cool season and/or winter annual broadleaf. This brassica is versatile enough to be planted in the spring for a summer cover, or may be utilized in the fall for a winter cover crop. Rapeseed brassica works great as a dual-purpose crop, adapting to a wide range of soil types and conditions. Rapeseed tends to be extremely drought-tolerant and stands frost better than many brassicas. Because of its winter hardiness, it’s common for growers to get multiple grazing cycles when feeding rapeseed brassica.

  • Deep, fibrous root system, scavenging both nitrogen and soluble phosphorus
  • Strong biomass production makes it great for fall and winter grazing
  • Offers the most grazing cycles of brassica when planted in late summer/early fall

Visit our Mixes page to explore premium Soil First mixes blended with different brassica varieties. View mixes.

Non-Forage Benefits:
1 = Poor; 5 = Excellent

Compaction Alleviation: 5
Weed Suppression: 3
Biomass Production: 4
Erosion Control: 4
Disease/Pest Control: 4
Pollinator/Beneficials: 4
P & K Cycling: 4
Ease of Establishment: 5

Nitrogen Fixer/Scavenger: Scavenger

Nutritional Value:
Values Vary Greatly Depending on Maturity

Crude Protein: 14
NEL¹ Mcal/lb.: TBD
ADF%²: 28
NDF%³: 41
TDN: 57
DM Tons/Acre: 1.5-4
Days to First Harvest: 60-80
Days to Next Harvest: –

¹- Net Energy for Lactation = Energy available after subtracting digestive and metabolic losses
²- Acid Detergent Fiber = Low values mean more digestible
³- Neutral Detergent Fiber = Low values mean cows can eat more

Ranking (Good, Better, Best):
Graze: Good
Baleage: Better
Chop: Best

Planting Time:
Apr.-May; Aug.-Sept.

Seeding Rate:
Mono (lbs./acre): 4-6
Mix (lbs./acre): 2-4
Forage (lbs./acre): 6-8
Aerial (lbs./acre): 5-8

Seeding Info:
Carbon/Nitrogen Ratio (C:N): 20:1 – 22:1
Seeding Depth (in./with drill): 1/4-1/2
Seeds/lb.: 145,000
Bulk Density (lbs./ft.³): 45
Aerial Application Rate: 5-8
Germination Soil Temp.: 41 F
USDA Hardiness Zone: 5
Days to Emergence: 4-10


    • Rapeseed can be more difficult to control with glyphosate
    • Prefers soils with a pH 5.8-8.0
    • Rapeseed may attract some non-beneficial pests

Brassica Crops can cause animal health disorders if not grazed properly. Introduce grazing animals to brassica pastures slowly (usually over 3-5 days). With extremely high forage values, brassicas can cause problems if hungry animals are turned out into predominate brassica pastures. Even though traditional recommendations allow for 2/3, we actually recommend keeping brassicas to under 1/3 of the grazing animal’s diet- always supplement brassicas with dry hay or other grasses (higher in fiber).

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