Piper sudangrass is a warm-season annual, commonly grown for forage. With finer stems and leaves than sorghum-sudangrass, Piper Sudangrass can be used for grazing or hay. Piper is known for its rapid growth and lower prussic acid content. It will also produce large amounts of organic matter and will suppress weeds.
Drilled Seeding Rate: 15 lbs/acre
- Planting Time: Late Spring – Mid Summer
- Sudangrass needs a minimum soil temperature of 60 degrees to germinate
- Drilled Seeding Rate: 15 lbs/acre
- Ideal Seed Depth: ¾” – 1”
Use the fertilizer rates below for maximum yield potential:
|Recommended Application Rate (Lbs/acre)|
|Soil Fertility Level||Nitrogen (N)||Phosphorus (P2O5)||Potassium (K2O)|
*Rates are recommended if no soil test is taken.
- Apply ½ rate of nitrogen before or immediately after planting, and the other ½ rate 30 days after emergence.
- If crop is intended for multiple cuttings, split apply the total rates recommended between each cutting.
- Do not exceed a total of 10 lbs/a of N+K if fertilizer is placed in-furrow at planting.
Plant into a clean, weed-free seedbed and use the herbicide options below for optimal weed control:
|Timing||Herbicide||Rate||Notes||Weeds Controlled||Control Method|
|Preplant or Preemergence||Roundup (Glyphosate)||32 oz/a||Apply any time before crop emergence||Grasses & Broadleaves||Contact|
|Post-emergence||Broclean (Bromoxynil)||1-1.5 pts/a||Apply from 4-leaf stage and prior to preboot stage||Broadleaves||Contact|
|Starane Ultra (Fluroxypyr)||0.3-0.4 pts/a||Apply from 4 – leaf stage through 7-leaf stage||Broadleaves||Contact|
Disclaimer: All products and rates were provided by university-based sources and product labels. Always follow label instructions and consult your local chemical dealer and seed dealer before making any applications or planting of seed.
- Hay or Haylage: Cut piper sudangrass in the early boot stages or sooner and leave about 6” of stubble for optimal regrowth.
- In a single cut system allowing plants to mature to at least the early heading stages will maximize yield
- Grazing: Begin when plants are at least 18” tall and graze to a stubble height of 4-6” before removing livestock to allow regrowth.
- Nitrates: Sudangrass that is stressed to the point of stunted growth can accumulate nitrates in the lower portion of the plant and should not be grazed or hayed during these stress periods. Ensiling sudangrass with high levels of nitrates will reduce them to safe levels.
- Prussic Acid: Avoid sudangrass for 5-7 days following a killing frost due to the potential for prussic acid concentrations to reach toxic levels. After this period, it is safe to graze for the remainder of the season. If haying, the drying process will allow prussic acid to exit the plant and hay will be safe to feed. Ensiling also eliminates prussic acid concerns in sudangrass.