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Rotation Top Pest Management Practice on Iowa Soybeans
Iowa Ag Connection - 05/15/2018

The 2017 Agricultural Chemical Use Survey of soybean producers collected data about fertilizer and pesticide use as well as pest management practices in growing soybeans.

Fertilizer refers to a soil-enriching input that contains one or more plant nutrients, primarily nitrogen (N), phosphate (P2O5), and potash (K2O). Of the three primary macronutrients, potash was the most widely used on soybeans acres planted in Iowa according to the latest USDA, National Agricultural Statistics Service -- Agricultural Chemical Use report. Farmers applied potash to 34 percent of planted acres at an average rate of 104 pounds per acre per year. Macronutrients nitrogen and phosphate were applied at an average rate of 12 and 62 pounds per acre per year, respectively. The secondary macronutrient, sulfur, was applied to 6 percent of acres planted to soybeans.

The pesticide active ingredients used on soybeans are classified in this report as herbicides (targeting weeds), insecticides (targeting insects), fungicides (targeting fungal disease) and other chemicals (targeting all other pests and other materials, including extraneous crop foliage). Herbicide active ingredients were applied to 95 percent of the soybean acres planted. Fomesafen sodium was the most widely used pesticide on soybean acres, but glyphosate isopropylamine salt was the active ingredient with the greatest total amount applied. Fungicides and insecticides were applied to 17 and 19 percent of soybean acres planted in Iowa.

Rotating crops during the past 3 years was the top pest management practice on Iowa soybean acreage.

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