Comprehensive information on Nitrogen Use Efficiency for cereal crop production
By-Plant N Management
Excel file with treatment structure

Effect of Altered Nitrogen Distribution on Corn Grain Yield (N Distribution)

Objectives

1. To determine the application resolution at which N competition influences corn grain yield.
2.  To determine the N application resolution at which corn grain yields are maximized.

9-Plant Sequences, 3-row plots

Plant population, 30 rows, 6 spacing (34848 plants/ac) and 10 spacing (20942 plants/ac)

Preplant N rate:    40 lb N/ac

Topdress N rate:  55 lb N/ac dryland or 110 lb N/ac irrigated

Row Spacing: 30 inches

Area per plant:  6 distance = 1.25 ft2, 10 distance = 2.08ft2

Variables to be measured:

NDVI at V8 and V12
Grain yield, by plant from all treatments and set

Effect of Delayed Emergence on Corn Grain Yields (Delayed Emergence)

Objectives: 

1. To determine corn grain yield reduction as a function of delayed plant emergence, simulated by delayed planting.
2.  To determine yield levels associated with 3 plant sequences, with and without delayed emergence.
3.  To determine if v8-v12 NDVI readings can be used to detect single plants that are behind.

3 Plant Sequences, 3, 3 continuous sets.

            Delay in Planting                                                       N rate, lb/ac

1.         All 3 plants planted on the same day                      50
2.         Middle plant planted 2 days late                              50       
3.         Middle plant planted 4 days late                              50
4.         Middle plant planted 6 days late                              50
5.         Middle plant planted 8 days late                              50
6.         All 3 plants planted on the same day                      150
7.         Middle plant planted 2 days late                              150    
8.         Middle plant planted 4 days late                              150
9.         Middle plant planted 6 days late                              150
10.       Middle plant planted 8 days late                              150 

Variables to be measured:

NDVI at V8 and V12
Grain yield, by plant from all treatments and sets

Example (treatment 2), Border rows left and right, all plants planted on the same day.

Causes of Plant to Plant Variability in Yield within Corn Production SystemsBy Plant Yield Prediction in Corn Production Systems
 
 
 
 
 
 
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