There have been many questions about fall versus spring applications of phosphorus (P) and potassium (K) to soybeans. Does it really matter if P and K are applied in the fall or in the spring? We looked at published studies to see what we could find.
At times potassium (K) can be the forgotten element when determining appropriate rates of fertilizer to apply. Nitrogen and phosphorus typically are of main concern due to the potential yield response for corn to nitrogen and many soils around the state historically being low in P but medium to high in K. Potassium should not be a forgotten nutrient as there are situations where K fertilizer can be profitable.
Traditionally, farmers apply phosphorus (P) and potassium (K) fertilizer and lime in the fall when there is more time and equipment available and soil compaction may be less of a concern. This year (2014) is somewhat different because of delayed planting and maturity.
Ohio State University’s College of Food, Agricultural, and Environmental Sciences is ramping up its efforts to improve Ohio’s water quality through a new fertilizer applicator certification training program that’s designed to help growers increase crop yields using less fertilizer more efficiently, thus reducing the potential for phosphorus runoff into the state’s watersheds.
U.S. farmers are cutting back on spreading fertilizer this autumn in response to a drop in crop prices to multi-year lows and a delayed harvest, dealers say, warning of a pullback that will be felt from grain markets to Canadian potash mines.
Growers wanting to increase crop yields while helping to improve Ohio’s water quality can do so using a set of best management practices when applying fertilizer to their fields this fall, according to a group of agronomists and agricultural engineers with Ohio State University’s College of Food, Agricultural, and Environmental Sciences.