Reduced Seeding Rate on Lower Landscape Position (>55 bu/A High Yield Zone)

Trial Type

Seeding Rate/ Varieties/ Row Spacing

General Stats

County
Brookings
Replications
4
Crop
Soybean
Seed Brand
No Value
Variety
No Value
Relative Maturity
1.9
Tillage
Conventional Till
Irrigated
No Value
Drain Tile
No Value
Previous Crop
Corn
Row Sapcing
30"
Plant Population
130000
Plant Date
19/05/2016
Cover Crop
No Value
Seed Treatment
Fungicide, Insecticide, Inoculant

Soil Stats

Soil Type
Fine
Soil pH
4.0
Organic Matter
No Value

Methodology

Treatment Information
The field was planted at 160,000 seeds ac-1 except for four
treatment strips, which were each seeded at 130,000 seeds
ac-1 and strategically placed in a lower elevation.

Agronomic Information and Weather
Soybeans with a 1.9 maturity rating were planted in 30” rows on May
19. The field was conventionally tilled and the previous crop was
corn. Seed was treated with insecticide, fungicide, and a B.japonicum
inoculant. The previous crop was corn. The field received approx.
10.29 in. of rain and accumulated 1844 GDDs from June 1 through
August 31. This was warmer and similar to the average of 1668 GDDs
and 10.62 in.

Results

Results
The average of the four strips showed no significant yield difference
at the 95% CI. Therefore, reduced seeding rates may be an effective
method for reducing costs. These findings were in agreement with
2016 trials in Lincoln and Brown Counties. However, lowering the
seeding rate may not be a good management practice on summit
positions, as evidence from 2016 SD trials suggests a 200k seeding
rate may be best. Additional trials are needed in 2017 to investigate.

Rainfall

Temperature

Applications

Fertilizer Applications

Insecticide Applications

Fungicide Applications

Herbicide Applications