September 9, 2016
With low winter wheat prices, should crop producers abandon wheat as part of their cropping system? Growers across western Nebraska often say they produce winter wheat so they can grow higher-value crops, such as dryland corn, sunflowers or grain sorghum. Does that statement still hold true with corn prices higher than winter wheat prices?
FIGURE 1: Wheat harvested with a stripper header left more residue anchored to the soil surface and had 9 inches of plant-available water by April 12. Both fields in Figures 1 and 2 were at the Henry J. Stumpf International Wheat Center near Grant in western Nebraska.
What are the benefits of producing a good winter wheat crop? First, properly managed winter wheat residue is very effective in reducing the evaporation (E) in evapotranspiration (ET). It can reduce evaporation from 35% of the crop water use to 15%. The winter wheat residue is also very effective in breaking up raindrops. Raindrop impact can result in fine soil particles consolidating on the surface to form a thin crust. Soil crusts can reduce infiltration rates up to 75%, resulting in erosion and water loss.
Good winter wheat residue also results in greater soil water. A 60-bushel-per-acre winter wheat crop harvested with a stripper header had over 72 inches (Figure 1) of soil water or about 9 inches of plant-available water by April 12 at the Henry J. Stumpf International Wheat Center near Grant. In contrast, Wheat Center plots that were cut with a platform header at about 10 inches high and did not have the residue properly spread only had 26 inches of soil water by April 12, or about 4.3 inches of plant-available water (Figure 2). The 4.7-inch difference in soil water in this example is estimated to increase corn or grain sorghum by about 56 bushels per acre in years with average precipitation during the growing season for this area. The soil at the Wheat Center changes to sand at about 3 feet, hence the reduced plant-available water.
FIGURE 2: Wheat plots cut about 10 inches high where residue was not spread and could blow away had 4.3 inches of available water by planting time.
Even in dry years, it is possible to produce 70-bushel-per-acre corn or grain sorghum if you had a good winter wheat crop the previous year and managed the crop residue properly.
Additional benefits of having winter wheat in a crop rotation are timely utilization of available water, reduced soil erosion and buildup of organic matter in the soil. Also, a longer rotation including wheat will aid weed suppression and help better manage weeds, insects and diseases. Including winter wheat also helps distribute labor requirements and, because of crop diversification, reduces risk.
Although the current price of winter wheat does not provide much incentive to grow the crop, the benefits of wheat in a crop rotation, especially in a water-limited environment, are numerous. Producers need to look beyond the price of winter wheat and consider the synergistic and additive value of winter wheat on other crops in their rotation. Without wheat residue to protect the soil moisture for other crops, yields of those higher-value crops will fall. Understanding how much support wheat gives to the yields of other crops in a rotation allows us to put a more accurate value on the wheat crop.
For more information, contact Robert Klein, University of Nebraska Extension crops specialist at [email protected]; Cody Creech, Extension dryland cropping systems specialist at [email protected]; or Rodrigo Werle, Extension cropping systems specialist at [email protected].
Source: UNL CropWatch
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