Greg La Barge, Extension Agent, Agriculture and Natural Resources
To determine yield response of soybeans to foliar fertilization with manganese containing fertilizers on deficient soils.
| Cooperator: | Nate Andre | Variety: | Garst 269RR |
| County: | Fulton | Planting Date: | May 25, 2002 |
| Soil Type: | Mermill loam | Seeding Rate: | 180,000 seeds/A |
| Tillage: | No-till | Row Width: | 10-inch |
| Previous Crop: | Corn | Herbicides: | 26 oz/A Roundup |
| Soil Test: | pH 7.1, P 33 ppm, | Harvest Pop: | 150,000 plants/A |
| K 77 ppm, Mn 7 ppm, | Harvest Date: | October 8, 2002 | |
| OM 5.3%, | |||
| CEC 12 meq/100g | |||
| Fertilizer Rate: | No broadcast; See Table 2 |
A field area known to be manganese deficient was divided into plots 10 feet wide by 40 feet long in a randomized complete block design with six replications. Foliar fertilizer containing only manganese was compared to products containing other nutrients and growth regulators. The products and their label-reported concentrations of nutrient are included in Table 1. Products were applied according to labeled rates. All products except the XBX were applied in 20 gallons of water per acre using a CO2 sprayer and 10-foot boom with TeeJet XR11004VS nozzles on 7/10/02 at 20 PSI. The XBX was applied in 10 gallons of water per acre on 8/9/02. Soybeans for the July application were in the R1 stage of growth with first flowers starting and six leaves. Table 2 lists the application treatments.
The products were used on this basis: Postman was used as a primary Mn source. Harvest More Urea Mate was used as a total foliar program. X-cyte and Stimulate are hormone-containing products intended to reduce stress and provide for more fruit set. Golden Harvest Plus 5-18-2 is very acidic and added to lower the acidity of the spray solution in combination with a lower rate of Mn product. XBX is an experimental product containing boron (B) since it is presumed that additional B may set more pods.
Table 1. Product Analysis Information.
| Product | lb/gallon | Analysis |
| Post-man | 10.5 | 5% Mn Chelate, 2% S |
| Harvest More Urea Mate | Dry | 5-10-27 with 4% Ca, 1.5% Mg, 0.15% B, 0.008% Co, 0.03% Cu, 0.5% Mn, 0.008% Mo, 0.5% Zn |
| X-Cyte | 8.4 | 0.04% Cytokinin |
| Stimulate | 8.4 | 009% Cytokinin, .005% Gibberellic Acid, .005% Indole-3-butyricacid |
| XBX | 10.0 | 4.5% B |
| Golden Harvest 5-18-2 | 11.2 | 5-18-2 with 0.4% Mg, 1% S, 0.1% B, 0.1% Cu, 0.05% Co, 0.4% Fe, 0.4% Mn, 0.05% Mo, 0.8% Zn |
Table 2. Treatments and Soybean Yields Adjusted to 13% Moisture.
| Treatment | Yield |
| (bu/A) | |
| Postman (3 qt/A) | 36.5 |
| Postman (1 qt/A) + Ureamate (5 lbs/A) | 36.4 |
| Ureamate (5 lbs/A) | 34.1 |
| Postman (1 pt/A) + Ureamate (5 lbs/A) + X-cyte (8 oz/A) + Stimulate (2 oz/A) + XBX (32 oz/A) | 33.9 |
| Postman (3 qt/A) + Ureamate (5 lbs/A) | 33.3 |
| Postman (1 qt/A) + 5-18-2 (10 oz/A) | 32.7 |
| Postman (1 pt/A) + Ureamate (5 lbs/A) +X-cyte (8 oz/A) + Stimulate (2 oz/A) | 32.7 |
| Check | 31.4 |
| LSD (0.05) | NS |
| F | <1.0 |
At the time of treatment application on July 10, plants in the treatment area showed foliar symptoms of manganese deficiency. The treatments were applied the day after a 0.5-inch rain shower and temperatures had cooled from the upper 90s during the previous 10 days to the low to mid 80s. All treatments including the check improved in coloration after this period and throughout the rest of the growing season. One may surmise that cooler temperatures and moisture allowed enough root growth to tap available Mn soil reserves. Thus, there were no significant differences in yield among the treatments.
Soil phosphorus and potassium levels were less than optimum; however, no broadcast treatment was applied. At 10 meq/100g CEC, crop removal applications of 90 pounds K2O (50 Bu/A yield goal) per acre are recommended for soil test levels of 100-130 ppm K. At 75 ppm K soil test level 130 pounds K2O are recommended. This lower potassium soil test level with no broadcast application may have limited yield potential particularly with the dry 2002 growing season resulting in less expression of the foliar treatments. Yield expectations are usually 50 to 60% more than what was experienced this year.
For additional information, contact:
Greg La Barge
Ohio State University Extension, Fulton County
135 Courthouse Plaza
Wauseon, OH 43567
419-337-9210
labarge.1@osu.edu