BMR Brachytic Sorghum Sudangrass Hybrid
Sorghum-sudangrass is a warm-season annual grass developed as a hybrid cross between sorghum and sudangrass. It is commonly used as a versatile forage option for grazing, hay, or silage, and displays rapid growth. Unlike forage sorghum, a sorghum-sudangrass hybrid will regrow following harvest by cutting or grazing. It is very drought tolerant and will grow well during the heat of the summer under limited moisture conditions. Used throughout the US, it can be productive in northern climates that have a short growing season. It also does best on well-drained soil and does not tolerate flooding or standing water conditions.
BMR Brachytic varieties express unique traits that improves forage quality. The BMR gene lowers lignin levels in the plant, which results in more digestible fiber and higher feed value in BMR varieties compared to non-BMR types. The Brachytic gene shortens the distance between nodes in the stem of the plant which increases the leaf to stem ratio and improves the overall forage quality without sacrificing yield. Brachytic hybrids will generally be shorter in stature with better standability than varieties without the Brachytic trait.
Drilled Seeding Rate: 15-20 lbs/acre
- Planting Time: Late Spring – Early Summer
- Sorghum Sudangrass needs a minimum soil temperature of 60 degrees to germinate.
- Drilled Seeding Rate: 15-20 lbs/acre
- Higher seeding rates will produce forage that is finer stemmed and easily cured for hay. Lighter rates will produce lower populations of more coarse stemmed plants most suitable for chopping or grazing.
- Ideal Seed Depth: ¾” – 1”
- Sorghum sudangrass requires approximately 30 lbs of N, 9 lbs of P₂O₅, 34 lbs of K₂O, and 6 lbs of S per ton of forage produced.
- Make fertilizer applications based on expected yield and soil fertility levels.
- 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 seed bed and use the herbicide options below for optimal weed control:
|Timing||Herbicide||Rate||Notes||Weeds Controlled||Control Method|
|Preplant or Preemergence||Atrazine 4L (Atrazine)||3.2-4 pts/a||Apply within 2 weeks prior to planting, or after planting but before crop emergence.||Broadleaves||Contact & Residual|
|Glyphosate**||32 oz/a||Apply any time before crop emergence.||Grasses & Broadleaves||Contact|
|.67–1 pt/a||Apply when crop is 5 to 12″ tall. Use drop nozzles if crop is 8″ or taller.||Broadleaves||Contact|
|Starane Ultra (Fluroxypyr)||0.3-0.4 pts/a||Apply from 3-leaf stage through the 7-leaf stage.||Broadleaves||Contact|
*Always read and follow label instructions before making an application.
**Different glyphosate products may have different application rates. Refer to the label before making an application.
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: Cut in the early boot stage for fastest dry down and leave a stubble height of 6″–8″ for optimal regrowth.
- Silage/Haylage: Cut in the boot stage and leave a stubble height of 6″–8″ if planning for multiple cuts. Cut in the mid-dough stage if planning for a single harvest.
- Grazing: Begin when plants are a minimum of 18″–20″ tall and graze to a minimum stubble height of 6″–8″ to allow regrowth before grazing again. Use a rotational system for best in-season utilization by livestock, or allow full growth for fall and winter grazing.
- Nitrates: Sorghum 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 sorghum-sudangrass with high levels of nitrates will reduce them to safe levels.
- Prussic Acid: Avoid grazing sorghum-sudangrass for 5–7 days following a killing frost due to 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 sorghum-sudangrass.