Project ID

E2004-06

Abstract

Multiyear field experiments using three crop rotations, two of which were low-external-input (LEI) systems, showed that cropping systems can be designed to achieve large reductions in agrichemical use while providing effective weed control and high yields and profits.

Key Question

Can diversified, low-external-input (LEI) cropping systems produce yields and profits that match or exceed those obtained from conventional systems?

Findings

These results show that diversified LEI systems can produce yields and profits that match or exceed those obtained from conventionally managed corn-soybean systems. Additionally, we learned that ecological processes such as weed seed consumption by rodents and insects can promote effective weed control in LEI systems, while allowing substantial reductions in herbicide use. Weed seed losses to rodents and insects can be enhanced by delaying tillage operations to leave seeds on the soil surface for as long as possible.

Principal Investigator(s)

Matt Liebman

Co-Investigator(s)

Robert Hartzler

Year of Grant Completion

2009

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