![]() ![]() Fields that were no-tilled and terraced even up to a 10% slope could have residue removed and still maintain less than 5 tons/acre/year water erosion. The research found that no residue could be removed if the land is tilled by disking unless the field is terraced, had 2% slope (but not 5% or greater), and yielded greater than 150 bu/ac. Regarding soil losses due to water erosion, additional studies in Gage, Sherman, and Chase counties in Nebraska looked at tillage, soil type, and terrace effects on the amount of residue that could be removed to maintain less than 5 tons/acre/year soil erosion from water for silt loam and silty clay loam soils. If there is moderate to high risk of wind or water erosion, much more should be retained, especially with if tillage is practiced. ![]() Retaining an average of 2.4 tons/acre annually is suggested for maintenance of soil organic carbon. If lime is worth $40/ton, $0.70 should be added to the value of crop residue.Īdditional values to the residue come from potential soil loss due to wind and/or water erosion, any potential yield loss (link to other CW article), any increased irrigation due to evaporative losses, and the cost of raking/baling/transporting residue. Harvesting 1 ton of corn residue removes cations equivalent to 35 lbs of lime. Removing them through residue harvest may mean lime will eventually be needed. However, if the soil has adequate capacity to supply some nutrients (such as potassium in Nebraska), the value of removed nutrients may be less (from 0-50% of fertilizer value).Īlso consider that positively charged ions in calcium, magnesium, and potassium help neutralize soil acidity. Of note, this formula takes into account the full fertilizer value of the nutrients removed. Nutrient amount (lbs/ton) x fertilizer price ($/lb) = Value of Nutrients in Stover ($/ton)Ĭalculate the value of each nutrient and then total these values for total nutrient value. Multiplying these nutrient values in pounds per ton by current fertilizer prices in dollars per pound gives the value of nutrients in the residue based on dollars per ton of residue removed. Per ton of dry harvested corn or sorghum residue, average nutrient concentrations include 17 lbs of nitrogen, 4 lbs of P 2O 5, 34 lbs of K 2O, and 3 lbs of sulfur. For example, more nutrients are concentrated in leaves and husks than in the stalks. Nutrient value can depend on the season, management practice, time of harvest, location, and what part of the plant is being removed. ![]() For example, a 240 bu/ac field will produce approximately 6 tons of residue while a 120 bu/ac field will produce approximately 3 tons of residue. For every 40 bu/ac of corn produced (56 lbs at 15.5% moisture), 1 ton of residue (at 10% moisture) is produced. Grain yield is related to residue production. Some have also asked about how to estimate the total residue produced by a corn crop. With downed corn ears common in many areas and able to be raked up and baled with residue, we’ve received questions on the nutrient value of the residue (stover).
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