Richard Mulvaney says the use of synthetic nitrogen for modern cereal production is assumed to build soil organic matter by increasing the input of residue carbon. However, the University of Illinois fertility specialist says this assumption is at odds with declining levels of soil carbon and nitrogen documented in long-term cropping trials. He adds these declines in soil nitrogen and carbon are occurring even when fertilizer inputs exceed grain nitrogen removal.
Mulvaney will share what efforts need to be made to better match fertilizer usage to the crop’s demand for nitrogen. He will outline how a transition toward agricultural diversification may be needed, with greater use of legume rotations to reduce the need for synthetic nitrogen.
(Total Run Time: 54 Minutes. File Size: 52MB)
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