By Plant Corn Study
Questions:
1. Can we fertilize every 2, 3, or 4 plants and get the same yield?
At what scale does the competition for N influence corn grain yield?
Can yields and NUE be increased by fertilizing by-plant?
2. How many days delay in emergence results in decreased by-plant yield?
a. yield reduction versus x-day delay in emergence (graph)
http://www.nue.okstate.edu/Index_Publications/JPN_Kyle1.pdf
OSU Applicator (Spyder)
By Plant Prediction of
Corn Grain Yield
Causes of Plant to Plant Variability
(By
Plant N Management Trials) (Foliar
UAN, damage)
(Mexico,
Growth
Stage Where Differences are Best Detected) (Changing
Equations, Yield Prediction)
1. Nitrogen Rate Application Resolution, Can plants be fertilized
every 2, 3, 4 .... and obtain the same yield
Hypothesis:
Ho: N applied to each and every plant is not necessary because root
proliferation and competition, compensates for this need.
Ha: N applications to each and every plant lead to increased yield
because N is used where it is applied.
Every 1 plant
Every 3 plants
Every 5 plants
2. At what scale does the competition for N influence corn grain yield?
(use the same "rate" per area), but
will have to apply more N per plant as scale increases
a. fertilize every plant
b. fertilize every other plant
c. fertilize every 2 plants, 2 plants off
d. fertilize every 3 plants, 3 plants off
e. fertilize every 4 plants, 4 plants off
