|Plot Size:||15′ x 300′|
Soil Test Values (ppm)
Agro-Culture Liquid Fertilizers has two main foliar program options for soybeans. Depending on soil test Agro-Culture Liquid Fertilizers has two main foliar program options for soybeans. Depending on soil test levels, either a program of 3 gal/A Sure-K with 1 qt/A MicroLink Manganese or 2 gal/A fert-Rain are commonly used. For this experiment location, soil levels were medium to low on potassium with 70 ppm and 2.2% base saturation. In cases where potassium levels are medium, a foliar program including Sure-K would be a better option. In cases with higher potassium soils, ferti-Rain tends to work better. This experiment compared these two foliar programs applied at 3 different timings, keeping the total fertilizer rate for each product per acre for the season the same. Timings included (1) 1 application at V4, (2) 2 applications at V4 and R1 or (3) 4 applications at V4, R1, R2, and R3. (V4- 4 trifoliate, R1-beginning flower, R2-full flower, R3-beginning pod)
- All foliar applications increased soybean yields over the untreated check by at least 3 bu/A.
- With the soils in the experiment having medium potassium levels, there was no significant difference between the two foliar programs. However, at most timings, there was a slight advantage to the Sure-K with MicroLink Manganese application.
- There was no statistically significant difference in soybean yield between the 3 timings of application. This shows, that a grower can apply a full rate in a single application or split the rate and “spoon feed” the crop if they are making multiple pesticide applications. It is a good practice to apply small amounts of nutrition when making any postemergence application.