Defensive Hybrid
Offensive Hybrid
- A semi-upright variety, with pendulum leaves up to the ear and the remainder upright.
- A D type, which flexes from the R4 stage to black layer (so it must not run short of N late in the growing season).
- A semi-pendulum structure in which only the top four leaves were upright.
- An L2 type, which flexes kernels from pollination through the R4 stage.
Response to Population in Offensive Management Zone
(Revenue per acre minus increased nitrogen and seed cost)
35,000 Plants Per Acre
32,000 Plants Per Acre
$1,500 $1,200 $900 $600 $300 $0
Per Acre
240 lb.
270 lb.
300 lb.
240 lb.
270 lb.
300 lb.
Nitrogen Rate Per Acre
Defensive Hybrid
Offensive Hybrid
In the offensive management zones of the study field, the offensive hybrid responded to increased population, while the defensive hybrid did not. The defensive hybrid was a pendulum-type, and the offensive hybrid was upright-leafed. The graph shows the increased revenue per acre, minus the cost of increased seed and fertilizer, using 2022 values for seed, fertilizer and corn.
Response of Hybrids in Defensive Management Zones
35,000 Plants Per Acre
32,000 Plants Per Acre
$1,500 $1,200 $900 $600 $300 $0
Per Acre
240 lb.
270 lb.
300 lb.
240 lb.
270 lb.
300 lb.
Nitrogen Rate Per Acre
Defensive Hybrid
Offensive Hybrid
In the study field, planting a defensive hybrid in the defensive management zones, at its recommended 32,000 population, produced more revenue than planting an offensive hybrid at 35,000, using the normal nitrogen rate of 240 lb. per acre. The graph shows the increased revenue per acre, minus the cost of increased seed and fertilizer, using 2022 values for seed, fertilizer and corn.
Source: Farm Journal Test Plots
Test Plots - Defensive and Offensive Hybrids
Lori Hays
Created on June 7, 2022
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Transcript
Defensive Hybrid
Offensive Hybrid
Response to Population in Offensive Management Zone
(Revenue per acre minus increased nitrogen and seed cost)
35,000 Plants Per Acre
32,000 Plants Per Acre
$1,500 $1,200 $900 $600 $300 $0
Per Acre
240 lb.
270 lb.
300 lb.
240 lb.
270 lb.
300 lb.
Nitrogen Rate Per Acre
Defensive Hybrid
Offensive Hybrid
In the offensive management zones of the study field, the offensive hybrid responded to increased population, while the defensive hybrid did not. The defensive hybrid was a pendulum-type, and the offensive hybrid was upright-leafed. The graph shows the increased revenue per acre, minus the cost of increased seed and fertilizer, using 2022 values for seed, fertilizer and corn.
Response of Hybrids in Defensive Management Zones
35,000 Plants Per Acre
32,000 Plants Per Acre
$1,500 $1,200 $900 $600 $300 $0
Per Acre
240 lb.
270 lb.
300 lb.
240 lb.
270 lb.
300 lb.
Nitrogen Rate Per Acre
Defensive Hybrid
Offensive Hybrid
In the study field, planting a defensive hybrid in the defensive management zones, at its recommended 32,000 population, produced more revenue than planting an offensive hybrid at 35,000, using the normal nitrogen rate of 240 lb. per acre. The graph shows the increased revenue per acre, minus the cost of increased seed and fertilizer, using 2022 values for seed, fertilizer and corn.
Source: Farm Journal Test Plots