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North Alabama Wheat: 20 Production Practices for Higher Yields

Ernst Undesser
By Eddie McGriff, Alabama Regional Extension Agent October 9, 2017

North Alabama Wheat: 20 Production Practices for Higher Yields

1. Plant High Quality Seed

Farmers think they are saving money by planting bin-run wheat seed, but often it costs them money. Research has shown when a farmer’s seed is of good quality (free of weed seed, undamaged by insects, has high germination and vigor, and is disease free) it can be successful in producing a good crop.

Many times, however, research and experience have repeatedly demonstrated that planting bin-run or even custom-cleaned seed of low quality can lead to a disaster. If you are thinking about planting bin-run seed, consider the risks and legal aspects.

All professionally grown seed has passed both field inspection and seed testing standards for varietal purity and free from certain weed and other crop seeds and certain diseases (such as loose smut). It has also been treated with a fungicide to control seed-borne and seedling diseases. Most professionally grown seed will exceed 90% germination. This is often not the case with bin-run seed.

When saving bin-run seed farmers should have it tested to make sure it has high germination and is free of weed seed. The Alabama Department of Agriculture & Industries Seed Lab at 1445 Federal Drive, Montgomery, AL 36107 can perform this service.

Seed quality can change dramatically during storage, so it should be tested in the fall before planting. When a grower plants farmer-saved seed, crop insurance may be denied unless the grower can prove a germination test was conducted and the seed was of good quality.

Most developers or breeders on new wheat varieties have applied for and received intellectual property protection. In other words, the developer/breeder has the legal right to determine who may purchase, propagate and market the variety. Intellectual property protection comes in two forms and many varieties are protected by both: the Plant Variety Protection Act (PVPA) as amended in 1994 and plant patents.

PVPA, as amended in 1994, allows a grower to collect and save seed produced from any legally purchased PVPA-protected variety. Farmers can use this seed for their own future planting, but they cannot sell, trade or transfer it to others for planting purposes. Most varieties fall under this designation but there are a few varieties that are patented and cannot be saved to replant.

Seed of varieties by a plant patent may not be saved for seed under any circumstances.

Growers, to remain compliant with the law, must determine the level of intellectual property protection afforded to a variety. Here are some helpful hints for growers to follow to remain compliant with the law:

  • The seed analysis tag will identify the variety as being protected by the PVPA
  • The patent statement will likely be found on the seed bag
  • Visit the Plant Variety Protection Office website
  • Contact the developer/breeder of the variety
  • For certified varieties contact the state seed certification agency

2. Use a Grain Drill to Plant Wheat

Wheat growers have called me numerous times over the last 35 years due to poor wheat stands when broadcasting wheat seed. Rarely have I been called to look at a poor wheat stand associated with a grain drill. Broadcasting wheat seed is an accepted practice, but the risks of a poor stand when broadcasting are significantly higher with broadcasting than drilling.

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In general, drilling wheat seed yields 7 – 8% more than broadcasting and if incorporation of seed is poor, the yield differences are even greater.

Helpful Tips When Broadcasting Wheat

  • Some new tillage tools such as the turbo till do not incorporate seed very well. Field cultivators perform better than disks or turbo tills.
  • When broadcasting, the spreading implement should be calibrated to spread 40 seeds per square foot.
  • When mixing small grain seed with fertilizer, spreading should be done as soon as possible and not be left overnight. The longer small grain seed is left mixed with fertilizer the more potential for reduced germination.

3. Use Deep Tillage to Disrupt Hard Pans

No-till wheat can be productive (mostly on heavy, clayey soils) especially if the field has been in continuous no-till. Wheat is one of the least effective small grains in penetrating dense soils so the root canals of previous crops are critical to successful no-till production of wheat.

Hardpans can develop where growers are going back and forth from no-till to conventional tillage. Growers can check for hardpans with a penetrometer or soil probe and if a hard pan has developed then deep tillage should be considered.

Wheat responds well to deep tillage when hard pans are present. Alabama, Georgia and South Carolina research have consistently shown increased wheat yields with deep tillage if a hard pan is present.

Deeper tillage allows for easier root penetration, burial of diseased debris, possible dilution of root pathogens, and improved water infiltration. It is especially beneficial in wet years because low soil-oxygen conditions are compounded by compacted soils. Water-logged soils will reduce yield of most small grains due to poor root growth and nutrient uptake.

Disking is a common practice in wheat production. Disking is not as effective as deep tillage. It can provide an excellent seedbed but may lead to the formation of a compacted layer of soil. The weight of the implement is concentrated in a very small area at the tip of the disk, and when disking is repeated several times, a hardpan can form.

4. Plant During the Recommended Planting Dates

The recommended planting dates for North Alabama are October 15 – November 10. The optimum time to plant would be 7-10 days before and after the first average killing frost date. The higher altitudes, such as Sand Mountain, would have an earlier average killing frost so October 15 to November 1 would be more optimum range of planting dates where as much of the rest of north Alabama the optimum range would be October 25 to November 10.

Wheat planted in this time frame has a better opportunity to develop enough tillers prior to January or early February. Fall tillers will have stronger roots, larger heads with better capacity for high test weights, and tolerate more stress. Research has shown fall tillers account for 85% of yield.

5. Plant High Yielding, Pest Resistant, Well Adapted Varieties to North Alabama

Here is the site for the 2016 – 2017 Performance of Small Grain Varieties in Alabama to see how wheat varieties performed at the Experiment Stations at Crossville and Belle Mina. Another source to look at how some of the wheat varieties performed that were not in the Alabama trials but a similar environment to North Alabama would be the University of Georgia’s Griffin Experiment Station. These results can be found here.

6. Plant the Appropriate Number of Seeds Per Acre

Growers should base their seeding rate on seeds per acre, not bushels or pounds per acre. The number of wheat seed can vary greatly between 10,000 and 18,000 seeds per pound, so growers should know their seed size to properly determine their seeding rate.

Optimum wheat seeding rates can vary greatly due to differences in seed quality, genetics, planting conditions or planting dates, and planting methods (drill versus broadcast). Multiple seeding rates studies conducted in the southeast have shown that 1.2 to 1.5 million seeds (minimum germination 85%) is optimum.

This equals to seeding about 30 – 35 seeds per square foot. If planting is delayed beyond optimum planting dates, then seeding rates should be increased by 15 – 20%.

7. Plant at the Proper Depth

Wheat emerges best when planted 1 – 1.5 inches deep.

8. Use a No-Till Drill When Planting in Heavy Stubble

One of the biggest obstacles to getting a good stand in north Alabama is planting in heavy corn stubble. A no-till drill will help overcome this handicap.

9. Develop a Good Strategy to Control Weeds

In North Carolina, Italian ryegrass has reduced wheat yields 31-90% (A.C. York, NCSU unpublished data) and Brewster et al. reported wheat yield losses of 8 to 88% due to Italian ryegrass in Oregon.

Alabama Extension weed scientist Dr. Joyce A. Treadway advises, “Although Anthem Flex (a combination of Zidua and Aim) and Zidua are labeled for delayed preemergence (PRE) applications, we determined from our research over the last two years, that ryegrass control was as good or better when these products were applied early post-emergence (EPOST).

“Zidua delayed PRE controlled ryegrass 97 and 83% at 62 and 103 days after planting, respectively. Zidua EPOST controlled ryegrass 80 and 82% at 62 and 103 days after planting, respectively. When Metribuzin was added to the Zidua for the EPOST application, ryegrass was controlled 97% and 93% at 62 and 103 days after planting, respectively. “

She warns, “Growers must be aware of ALS-resistant ryegrass. The ALS-inhibiting herbicides Osprey and Powerflex will not control ALS-resistant ryegrass. If you have not received good ryegrass control from either or both of these products in the past, there is a high probability that ALS-resistance is present.

“Combinations such as metribuzin plus Zidua have proven highly successful with up to 99% ryegrass control when applied EPOST. However, Metribuzin at two ounces per acre should be added to Zidua if any ryegrass has emerged by the time of the EPOST application. In addition, Fierce at three ounces per acre applied EPOST also provided 99% ryegrass control.”

She adds, “For tough broadleaf weed control in small grains, Quelex provides control of henbit, horseweed (marestail), mustards, hairy vetch, and suppresses Canada thistle. Quelex may be applied from two-leaf to flag leaf emergence and cannot be applied within 60 days of harvest. It works very slowly so don’t expect to see activity for at least 2.5 to 3 weeks after application.”

10. Soil Test and Fertilize for High Yields

Soil pH should be between 6.0 – 6.5 for high yields. All phosphorus and potassium should be applied in fall if fertilizing for wheat only. If using poultry litter, a nutrient analysis should be taken and application rate applied according to the nutrient content. In general, two tons of poultry litter per acre is sufficient for fall growth. There is an increased risk of excessive growth and winter injury if more poultry litter is applied in the fall.

11. Apply Nitrogen in the fall to Encourage Tiller Production

In general, 30 pounds of nitrogen should be applied just prior to or at-planting. There may be some nitrogen credit given to legumes such as soybean and peanuts but is critical to have nitrogen available to encourage tiller production before winter. It is important not to over-fertilize with nitrogen in the fall as it may cause excessive growth and result in winter injury.

12. Topdress Wheat with Nitrogen in a Timely Manner

Nitrogen rates will vary according to soil type, variety lodging resistance, irrigation capability, previous crop, yield goal, etc. In general, total nitrogen rates range from 100 – 120 pounds per acre. The remaining nitrogen should be applied at or just before stem elongation. Stem elongation in North Alabama occurs from mid-to-late February. In extreme North Alabama stem elongation may not occur until early March.

13. Tissue Test and Monitor for Nutrient Deficiencies

Tissue testing should begin at full tiller to monitor for nutrient deficiencies. Visual sulfur and nitrogen deficiencies are similar (pale green to yellow tissue).

Sulfur deficiencies may occur when nitrogen:sulfur ratio exceeds 18:1. A ratio of nitrogen:sulfur between 9:1 and 18:1 should be maintained for optimum growth. A good insurance policy would be to apply sulfur with nitrogen applications on wheat.

14. Control Aphids and Scout for Insect Pests

Alabama Extension entomologist Dr. Kathy Flanders advises, “Controlling aphids is essential to protect against barley yellow dwarf and cereal yellow dwarf, diseases caused by viruses that are spread by aphids. In north Alabama, an insecticide seed treatment at the aphid rate, or a foliar spray with a pyrethroid insecticide 30 days after planting gives the best economic return.

If the winter is especially warm, also check for aphids in late winter and early spring, at the time of the nitrogen application, and apply an insecticide if aphids exceed threshold. There is always a risk from Hessian fly, so rotating your wheat and choosing a Hessian fly resistant variety is recommended.”

Dr. Flanders also warns north Alabama growers, “Cereal leaf beetles may cause problems around flag leaf and after. Scout wheat for this pest from late March through the end of April, and apply a foliar insecticide if populations exceed one cereal leaf beetle egg or larva per every two stems. Don’t let this pest get ahead of you. Once you see feeding damage on the leaves you have already lost some yield.”

15. Protect Against Disease

Two applications of a fungicide, depending on weather conditions, may be necessary to protect the plant from diseases and achieve a high yield. Photosynthates produced by the flag leaf may contribute up to 50% of the grain yield so it is critical to protect the flag leaf from disease.

Another fungicide application at early flowering (anthesis) may be necessary to protect the plant from Fusarium Head Blight (scab). Severe scab outbreaks are likely when three or more rain or irrigation events occur from the start of flowering through three to five days post-bloom, particularly on scab-susceptible varieties.

Extended post-flowering rains also contribute to increased disease severity and elevated mycotoxin contamination. Conversely, dry weather patterns during this time will suppress scab development. Wheat drilled behind no-till corn is at the highest risk for Fusarium Head Blight outbreak given favorable weather patterns for the disease.

Fungicides for Fusarium Head Scab must be sprayed at early flowering to be effective, which may make a fungicide application difficult since the weather conditions that are favorable for scab are also unfavorable for fungicide applications. The best fungicides for reducingFusarium Head Scab are Prosaro and Caramba. Propiconazole and Tebuconazole are also labeled for Fusarium Head Blight.

Please note that these are all triazole fungicides. Application of strobilurin fungicides have shown to increase DON levels in wheat by killing fungus competing against the DON mycotoxin.

Strobilurin fungicides such as Quadris, Evito, Approach, and Headline or fungicides with strobilurin combinations such as Quilt, QuiltXcel, Stratego YLD, Stratego, Approach Prima, Twinline, Priaxor, or Absolute should be avoided during flowering if Fusarium Head Blight is a concern.

16. Consider a Plant Growth Regulator if Lodging is a Concern

There is a fine line between adequate nitrogen for high yields and lodging. If lodging is a concern, a plant growth regulator can reduce lodging and improve yields. Plant growth regulators interfere with the biosynthesis of gibberellic acid to prevent cell elongation, which shortens the internodes and strengthens the stem.

17. Use Tramlines

This is the one production practice that is the least likely to be used except by growers striving for very high yields. Tramlines can be established by closing one or more openings in the drill when planting the crop to match the traffic pattern.

This can be done by mechanically retrofitting the drill with clutches attached to the metering cup to close the opening to leave unplanted rows designed to fit the wheel spacing of your sprayer or tractor. Devices can be purchased to establish tramlines on any tractor width in any multiple of drill widths.

Tramlines may also be formed after the crop has emerged by chemically killing the rows with glyphosate that match the width of the implements used to apply fertilizer or pesticides. Precision tools such as light bars and GPS guidance systems can help reduce the error of overlapping when attempting to chemically kill rows to produce a tramline. Chemically kill wheat early once the plant has one to two well-developed leaves.

Using tramlines in intensively managed wheat makes applying uniform sprays much easier. They improve the precision of applications. They can be used as guides for repeated applications and save on the cost of aerial applications.

They reduce the chance of disease development when compared to plants that are crushed by running over standing wheat. Research has shown that the border plants will compensate for yield losses by 50 – 60%, whereas plants damaged by tires rarely produce good grain.

18. Irrigation

Most of north Alabama’s wheat crop is dry land. Irrigation will especially beneficial in dry falls in establishing a stand during the optimal planting period.

High yielding wheat needs 14-17 inches of water depending on weather conditions and length of growing season. Wheat requires about six inches of water as a threshold for grain yield.

Each additional inch of water will provide 4-5 bushels per acre. In well-drained soils, the roots of wheat will extract water from a depth of three feet. Wheat is most sensitive to water stress in the boot to flowering stage.

Irrigation should be avoided prior to and during flowering to help avoid Fusarium head scab. Water in the root zone should be adequate prior to flowering.

Wheat can use up to .3 inches of water per day depending on air temperatures and cloud cover. Daily water use is referred to as evapotranspiration (ET) and depends on plant development and weather conditions. Wheat’s water use will generally peak between heading and early dough stage.

19. Harvest Wheat as Early as Possible

Wheat easily sprouts when the grain is exposed to rainy weather after maturity. Harvest the crop as soon as possible to avoid field losses and maintain good quality grain. Dry the wheat if harvesting above 15% moisture.

20.  Get Your Planters and Combines in Running Order Before They are Needed

It is important to make sure all equipment is properly calibrated and ready to run when it comes time to plant or harvest. Avoiding delays is critical to insure high yields.

Ernst Undesser
By Eddie McGriff, Alabama Regional Extension Agent October 9, 2017