Skip to main content
ARS Home » Midwest Area » Ames, Iowa » National Laboratory for Agriculture and The Environment » Soil, Water & Air Resources Research » Research » Publications at this Location » Publication #369898

Research Project: Managing Carbon and Nutrients in Midwestern U.S. Agroecosystems for Enhanced Soil Health and Environmental Quality

Location: Soil, Water & Air Resources Research

Title: Long-Term benefits of humic product application to soil organic matter and physical properties in Iowa corn-soybean rotations

Author
item Olk, Daniel - Dan
item Dinnes, Dana
item ABDELRAHMAN, HAMADA - CAIRO UNIVERSITY
item SCORESBY, RENE - MINERALS TECHNOLOGIES (MTI)

Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 8/29/2019
Publication Date: 11/12/2019
Citation: Olk, D.C., Dinnes, D.L., Abdelrahman, H.M., Scoresby, R.J. 2019. Long-Term benefits of humic product application to soil organic matter and physical properties in Iowa corn-soybean rotations. In proceedings of ASA-SSSA-CSA Annual Meeting, Nov 10-13,2019, San Antonio, Texas. Available: https://scisoc.confex.com/scisoc/2019am/meetingapp.cgi/Paper/120820.

Interpretive Summary:

Technical Abstract: Five years of humic product application to an Iowa corn-soybean field experiment resulted in small improvements in subsoil penetrometer resistance, dry aggregate stability, and bulk density. In a second field with six previous years of application, subsoil penetrometer resistance also improved, and the mass of a young humic acid fraction increased, but only on hillslope positions. Changes in the biochemical composition of this fraction with humic product application will be discussed. The most likely cause of improved soil properties with humic product application is increased crop root growth, which was demonstrated in nearby field trials.