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objectives
- Compare yields on rowed soybeans vs. drilled soybeans.
- Compare yields on drilled soybeans at three populations.
- Compare yields on soybeans with winter rye interseeded into drilled and rowed soybeans.
- Compare weed control between treatments with winter rye and without winter rye.
Field and planting records
- Organic status: Forth year chemical free
- Soil type: Kalamazoo Sandy Loam
- Previous crop: Corn
- Planting date: June 7, 2000 (Rye and Soybeans)
- Harvest date: October 12, 2000
- Plot size: 10' X 100'
- Experimental design: Randomized Complete Block, five replications
- Rye variety: Wheeler
- Soybean variety: NK 19-90
- Rotary hoed: June 16, June 19, June 28
- Cultivated: July 18
Treatments
| Trt # |
Row Width (inches) |
Soybeans Seeds/A |
Rye bu/A |
| 1 |
7.5 |
180,000 |
2 |
| 2 |
7.5 |
360,000 |
2 |
| 3 |
7.5 |
540,000 |
2 |
| 4 |
7.5 |
180,000 |
- |
| 5 |
7.5 |
360,000 |
- |
| 6 |
7.5 |
540,000 |
- |
| 7 |
30 |
180,000 |
2 |
| 8 |
30 |
180,000 |
- |
Results (Plants per acre, taken late July)
| Treatment |
Soybeans |
Rye |
Weeds |
| 180k soy, drilled, 2 bu rye |
131,225 |
186,764 |
3,812 |
| 360k soy, drilled, 2 bu rye |
206,910 |
219,978 |
1,634 |
| 540k soy, drilled, 2 bu rye |
284,229 |
209,633 |
0 |
| 180k soy, drilled, no rye |
102,366 |
- |
9,801 |
| 360k soy, drilled, no rye |
206,366 |
- |
10,890 |
| 540k soy, drilled, no rye |
288,585 |
- |
9,801 |
| 180k soy, rowed, 2 bu rye |
105,600 |
250,470 |
13,939 |
| 180k soy, rowed, no rye |
127,900 |
- |
871 |
Pounds per acre plant biomass, taken mid August.
| Treatment |
Soybeans |
Rye |
Weeds |
| 180k soy, drilled, 2 bu rye |
3793.2 |
315.7 |
30.7 |
| 360k soy, drilled, 2 bu rye |
4319.5 |
250.3 |
18.3 |
| 540k soy, drilled, 2 bu rye |
4477.0 |
159.4 |
2.5 |
| 180k soy, drilled, no rye |
3702.8 |
0.0 |
215.0 |
| 360k soy, drilled, no rye |
5025.7 |
0.0 |
14.5 |
| 540k soy, drilled, no rye |
4594.9 |
0.0 |
5.1 |
| 180k soy, rowed, 2 bu rye |
2199.2 |
906.3 |
24.7 |
| 180k soy, rowed, no rye |
4043.2 |
0.0 |
10.4 |
Soybean yield, bushels per acre.
| Treatment |
Yield |
| 180k soy, drilled, 2 bu rye |
35.7 c |
| 360k soy, drilled, 2 bu rye |
41.4 b |
| 540k soy, drilled, 2 bu rye |
42.0 b |
| 180k soy, drilled, no rye |
34.7 c |
| 360k soy, drilled, no rye |
40.1 b |
| 540k soy, drilled, no rye |
41.9 b |
| 180k soy, rowed, 2 bu rye |
36.7 c |
| 180k soy, rowed, no rye |
47.1 a |
| LSD @ (0.05) |
3.3 |
Observations
- Rowed soybeans yield was adversely affected by interseeding rye with no cultivation.
- Drilled soybean yield was not affected by interseeding rye.
- Drilled soybean yield increased when planting population was doubled from common planting rate.
- Drilled soybean yield did not increase when planting populations increased from double rate to triple rate.
- Weed counts and weed biomass were lower in treatments with interseeded rye, though soybean yield was not affected.
- The spring seeded winter annual rye grew well early in the season, but by August it began to die.
- Sandy soils at KBS allow for timely tillage after rainfall.
This study was replicated on three other Michigan farms. |
