Integrated Crop Management News
 

Document Type

Article

Publication Date

7-9-2020

Abstract

An ongoing public concern is the loss of nutrients from agricultural land in the corn belt. In Iowa, nitrogen and phosphorus losses from farm fields are driven by a variety of factors. Since the mid-twentieth century, statewide corn and soybean acres have increased as extended rotations, hay, and pasture declined. Compared to perennial crops and small grain rotations, corn-soybean and continuous corn rotations are leaky systems. They require increased fertilizer rates creating vulnerability to nutrient loss, have a lower capacity for capturing and holding nitrogen (N) during wet conditions, and lack surface cover to prevent soil erosion and phosphorus (P) loss during heavy rain events. These nutrient losses contribute to local stream and river impairments, create challenges for small communities in maintaining safe nitrate levels in drinking water, and add significantly to the size of the dead zone in the Gulf of Mexico.

Copyright Owner

Iowa State University

Language

en

File Format

application/pdf

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The Iowa State University Digital Repository provides access to Integrated Crop Management News for historical purposes only. Users are hereby notified that the content may be inaccurate, out of date, incomplete and/or may not meet the needs and requirements of the user. Users should make their own assessment of the information and whether it is suitable for their intended purpose. For current information on integrated crop management from Iowa State University Extension and Outreach, please visit https://crops.extension.iastate.edu/.