Efficiency of fall and spring broadcast fertilizer phosphorus application for corn and soybean in no-till
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The Department of Agronomy seeks to teach the study of the farm-field, its crops, and its science and management. It originally consisted of three sub-departments to do this: Soils, Farm-Crops, and Agricultural Engineering (which became its own department in 1907). Today, the department teaches crop sciences and breeding, soil sciences, meteorology, agroecology, and biotechnology.
History
The Department of Agronomy was formed in 1902. From 1917 to 1935 it was known as the Department of Farm Crops and Soils.
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1902–present
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- Department of Farm Crops and Soils (1917–1935)
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- College of Agriculture and Life Sciences (parent college)
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Abstract
Previous Iowa research has shown consistent grain yield differences among broadcast, shallow band, and deep band P placement methods for no-till corn (Zea mays L.) and soybean (Glycine max [L.] Merr.). One reason for lack of differences between P placement methods in Iowa might be that broadcast P was always applied in the fall (4-5 months before planting). This study evaluated the efficiency of fall and spring broadcast P application for corn and soybean under no-till by conducting 20 trials on fields testing 6 to 29 mg kg-1 (Bray-P1, 15-cm depth). Triple superphosphate was broadcast at 0, 10, 20, 30, 40, and 50 kg P ha-1 in the fall (in November or early December) and in spring (7 to 10 d prior to planting). Significant crop responses to P were observed at 11 sites for grain yield. The time of P application did not affect grain yield at any site.