What are the agronomic guidelines for and characteristics of annual forages?

The yield and nutritive value of annual forages vary greatly with maturity stage at harvest.

Forage crop Pure stand seed rate (lb/acre) Planting dates1 Planting depth (inches) Nitrogen

rate

(lbs/acre)

Dry matter yield (ton/acre) CP

(%)

NDF

(%)

Corn silage 28-34k2 4/20 – 6/15 1.5 – 2.0 Variable3 5 – 9 6 – 9 38-50
Spring oat 75-100 3/15-4/15 or 8/1-9/7 1.5 50-70 2.5-3.5 or 0.8-3.0 10-16 52-65
Spring triticale 90-110 3/15-4/15 or 8/1-9/7 1.5 50-70 2.5-3.5 or 0.8-3.0 10-18 50-65
Winter rye 110 9/1-10/15 1.5 50-70 2-4 in spring 10-18 51-65
Winter wheat 110-120 9/22-10/134 1.5 50-70 2-4 in spring 10-18 50-65
Winter triticale 110-120 9/20-10/10 1.5 50-70 2-4 in spring 10-18 50-65
Annual/Italian ryegrass 20-25 4/1-5/1 or 8/1-9/7 ¼ – ½ 40-50 each cut 2.5-6.0 11-19 50-65
Forage sorghum 8-12 5/1-7/15 ½ – 1 Variable3 7-8 7-12 50-66
Sudangrass, sorghum-sudan 20-25 5/1-7/15 ½ – 1 Variable3 3.5-5.0 9-15 55-68
Pearl millet 15-20 5/1-7/15 ½ – 1 Variable3 3.0-4.5 8-17 56-67
Teff 4-5 5/15-7/15 ⅛ – ¼ 50-60 2-4 13-16 55-65
Kale 3.5-4.0 4/15-6/7 ¼ – ½ 50-75 3-4 15-20 18-20
Rape 3.5-4.0 4/15-6/7 or 7/10-8/7 ¼ – ½ 50-75 3.0-3.5 15-20 18-20
Swede 1.5-2.0 4/15-6/7 ¼ – ½ 50-75 3-4 15-20 18-20
Turnip, turnip hybrids 1.5-2.0 4/15-6/7 or 7/10-8/7 ¼ – ½ 50-75 3.0-3.5 15-20 18-20

1 Planting dates for Ohio. In southern Ohio, the spring dates should be in the early range, and in the fall, they can be in the later range.
2 28,000 to 34,000 seeds per acre; seed companies provide hybrid specific planting rates. Corn cover crop seeding may require different rates.
3 For corn nitrogen recommendations see http://cnrc.agron.iastate.edu/, for sorghum grasses see Ohio Agronomy Guide, Chapter 7.
4 Best to plant after Hessian Fly safe date, consult Ohio Agronomy Guide for dates by region.

Updated: 7/11/2019

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