Andrew J. Margenot

Grounds for comparison: linking Arabica cup scores to soil fertility and plant nutrition in rust-resistant cultivars and traditional American coffees

Abstract The cup quality of rust-resistant Arabica ( Coffea arabica L.) × Robusta ( C. canephora Pierre ex Froehner) cultivars is thought to be inferior to traditional Arabicas, but few studies have examined the extent to which coffee cup scores are affected by local variation in...

Soil storage changes enzyme activity magnitudes but preserves activity sensitivity to long-term crop rotations and tillage practices

Abstract Soil samples are often stored prior to enzyme activity assays, but storage-induced changes could compromise the ability to differentiate activities among management practices. We used two field experiments in north-central USA – 27 y crop rotation × tillage on an Endoaqu...

Ecological state changes alter soil organic carbon stocks in the American Midwest: an equilibrium perspective

The U.S. Midwest exemplifies anthropogenically driven losses of soil organic carbon (SOC) following conversion of the North American prairie to agricultural over the past two centuries. The current near-equilibrium SOC of the agriculturally dominated Midwest is a new phase for th...