Oakes
W. Albus, L. Besemann and
H. Eslinger
Table 30. Results of the
soybean row spacing study at the Oakes Irrigation Research Site in 2006.
Some interest has been generated growing soybeans in paired rows on 30-inch row centers. The paired rows can vary from 7.5 to 10 inches
apart. The idea is to gain some of the yield advantage of narrow rows while retaining the ability to drive narrow treaded sprayers through fields with
out destroying crops. Paired rows facilitate more wind movement through the plant canopy versus narrow rows, reducing sclerotinia infestations.
The objective of this study was to determine the yield response of soybeans in paired rows on 30-inch centers to soybeans grown in 15 and 30-inch rows.
Soil: |
Maddock sandy loam; pH=6.8;
2.0% organic matter; soil-P and soil-K were very high; soil-S was medium. |
Previous crop: |
2005 - field corn and sweet
corn; 2004 - sweet corn; 2003 - cabbage and pumpkin. |
Seedbed Preparation: |
Fall disk. Multiweed (field cultivate) twice on May 9
to smooth the seedbed and incorporate herbicide. |
Planting: |
Planted on May 10 in 30-inch,
30-inch paired (2 rows
10-inches apart on 30-inch centers) and 15-inch row
spacing at 174,500 seeds/acre. All
beans were inoculated just prior to planting. |
Plots: |
Plots were 51 ft long by 10 ft
(4 rows in the 30-inch and 30-inch paired rows and 8 rows in the 15 inch
rows) wide. There were four reps. |
Fertilizer: |
On April 10, broadcast 20 lbs N/acre, 45 lbs P2O5/acre,
51 lbs K2O/acre and 13 lbs S/acre as 21-0-0-24, 11-52-0 and
0-0-60. |
Irrigation: |
Overhead sprinkler irrigation
as needed. |
Pest control: |
Treflan (pt/acre on May 9), Glyphosate
Original + NIS + AMS (1 qt/acre + 0.05%v/v + 1 lb/10gal on
June 1 and June 18) and Fusilade + MSO (8 oz/acre + 1 pt/acre on June 28) for
weed control and Warrior (3 oz/acre on August 24) for control of soybean
aphids. |
Harvest: |
Harvested on October 2 with a
Hege plot combine. A five-foot
section from the middle of each plot was harvested; the two middle rows were
harvested from the 30-inch and the 30-inch paired rows, and the four middle rows
from the plots with15 inch row spacing. |
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There was no significant difference among row spacing for yield, lodging or test weight. There was a tendency for the 30-inch paired
rows to lodge more than 15 or 30-inch rows. The 30-inch paired rows and the 15-inch wide rows tended to have a higher incidence of sclerotinia.
These factors may have limited yield in 30-inch paired and 15-inch rows.
Table 30. Results of the soybean row spacing study at the Oakes Irrigation
Research Site in 2006.
|
Yield |
Test weight |
Lodging |
row spacing |
bu/acre |
lb/bu |
|
15-inch |
60.5 |
57.1 |
4.4 |
30-inch |
62.2 |
57.2 |
4.5 |
30-inch paired |
59.5 |
57.0 |
4.9 |
|
|
|
|
Experimental mean |
60.7 |
57.1 |
4.6 |
LSD (0.05) |
NS |
NS |
NS |
C.V. (%) |
5.6 |
0.6 |
12.1 |
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Irrigation Research Site 2006 Annual Report
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