Steve Prochaska, Extension Agriculture and Natural Resources Agent
To evaluate the effect of a new inoculate on soybean yield in a modified relay intercropping system.
Modified Relay Intercropping is a system in which soybeans are planted into standing wheat around the time period of wheat pollination. Previous plot work over the last six years has resulted in soybean yields of 30 bushels per acre and wheat of 73 bushels per acre. (Yield averages over all treatments.)
| Cooperator: | Dave Brewer | Fertilizer: | 21-75-75 actual lb./A of |
| County: | Crawford | NPK fall applied 85 lb./A | |
| Soil Type: | Blount silt loam | actual N as 28% spring | |
| Tillage: | No-till | applied | |
| Previous Crop: | Soybeans | Varieties: | Wheat Hopewell |
| Soybean Herbicides: | POST Select (5 oz./A) | Soybean Pioneer 9306 | |
| Firstrate (0.3 oz./A) | Seeding Rates: | Wheat 120 lb./A | |
| Wheat Herbicide: | 2,4-D (1.5 pt./A) | Soybean 90 lb./A | |
| Wheat Row Width: | 10 inch | Wheat Planting Date: | October 1, 1999 |
| Soybean Row Width: | 10 inch | Harvest Date: | July 5, 2000 |
| Wheat Yield: | 73 bu/A | ||
| Soybean Planting Date: | 12, 2000 | ||
| Soybean Harvest Date: | Oct. 14, 2000 | ||
New soybean inoculants have been reported to give a positive yield response in conventional tillage soybeans. As such, USDA inoculate at the labeled rate was mixed well into soybean seed, and soybeans were immediately interseeded into wheat on 6/12/2000. Soils were moist at the time of planting.
A completely randomized design was used with four replications of two treatments ‹ USDA inoculate and untreated soybeans. Plot size per treatment was 0.138 acres. A 15-foot Great Plains 1500 drill was used to plant both the wheat and the soybeans in 10-inch rows. A 20-inch tramline was established in the wheat to facilitate soybean planting into wheat.
| Treatments | Yield (bu/A) |
| Control | 37.2 |
| USDA Inoculate | 37.1 |
| Significance (P = 0.05) F <1, CV = 4.5% |
NS |
There were no significant yield differences between the soybeans inoculated with USDA inoculate and soybeans without inoculate in the modified relay intercropping system.
For additional information, contact:
Steve Prochaska, Agriculture and Natural Resources Agent
Ohio State University Extension, Crawford County
117 East Mansfield Street
Bucyrus, OH 44820
419-562-8731
prochaska.1@osu.edu