DEKALB® CORN PRODUCT RESPONSE TO IRRIGATION AND POPULATION - 2020
Location | Yuma, CO Bethune, CO Mingo, KS |
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Soil Type | Sandy loam Sandy loam Silt loam |
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Previous Crop |
Corn Soybeans Soybeans |
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Tillage Type |
Strip tillage |
Planting Date | 05/15/20 05/07/20 05/05/20 |
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Harvest Date | 10/23/20 10/08/20 10/20/20 |
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Potential Yield (bu/acre) |
250 220 240 |
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Seeding Rate (seeds/acre) |
Variable |
At three testing locations, four DEKALB® corn products were planted at 24,000, 32,000, 36,000, 40,000, 44,000 and 50,000 seeds/acre under 100% FI (full irrigation meeting the evapotranspiration needs of the crop). And at 50% FI (half of the full irrigation rate per irrigation), the same five DEKALB corn products were planted at 18,000, 28,000, 32,000, 36,000, 40,000, and 48,000 seeds/acre.
Yuma, CO received 7.5” of rainfall throughout the growing season.
Bethune, CO received 10.1” of rainfall throughout the growing season.
Mingo, KS received 11.8” of rainfall throughout the growing season.
FI treatments received an average additional 8.1 inches of irrigated water per acre during the growing season across the three testing locations.
Each corn product and seeding rate was replicated twice per irrigation treatment.
Each location was irrigated with a variable rate center pivot system with nozzles placed within the crop canopy.
Average yield per thousand plants (YTP) was highest at the lower seeding rates for each irrigation treatment. For this trial, maintaining the YTP around the 6.5 to 8 bushels per thousand plants obtained the highest potential yield for that corn product in a particular growing environment.
Across all corn products and planting rates the extra 8.1 inches of irrigation applied to the FI treatment yielded an extra 61.5bu/acre, 223.1 bu/acre average at full irrigation and 161.6 bu/acre at half irrigation.
Across all products at the 50% FI rate, maximum average yield was achieved at the 36,000 seeds/acre seeding rate (168.9 bu/acre), and at the 100% FI rate maximum average yield was achieved at the 40,000 seeds/acre seeding rate (238.9 bu/acre).
Corn products respond differently when planted to different seeding rates and under drought stress.
Producers should discuss with their seed supplier when selecting what corn products and planting rates would best fit the seasonal potential rainfall and irrigation capacity.
January 21, 2020
Location | Mingo, KS | ||
Soil Type | Sandy loam | ||
Previous Crop |
Soybeans | ||
Tillage Type |
Strip tillage |
Planting Date | 5/12/19 | ||
Harvest Date | 10/15/19 | ||
Potential Yield (bu/acre) |
250 (Fl) 190 (50% of Fl) |
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Tillage Type |
Variable |
Because the number of farms with limited irrigation has increased due to reductions in pumping capacity or restrictions on the amount of water producers can pump over a certain time frame, it is imperative that Bayer tests corn products under varying irrigation rates to help provide better corn product recommendations by irrigation capacity.
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