Glossary beginning with R

Reduced-tillage

Description

Full-width tillage which involving one or more tillage trips which disturbs all of the soil surface and is performed prior to and/or during planting. There is 15-30 percent residue cover after planting. Weed control is accomplished with crop protection products and/or inter-row cultivation.

Authoritative On-line References and Resources

http://www.reducedtillage.ca/ The Reduced Tillage Linkages program is a partnership with farmer, industry, educational, wildlife and government support. The aim is to develop an extension program focused on improving the environmental and economic sustainability of farming in Alberta, Canada.
Resistance

Description

The inherited ability of a plant/weed to survive a dose of a herbicide normally lethal to that species.

Authoritative On-line References and Resources

http://www.weedscience.org/in.asp The International Survey of Herbicide Resistant Weeds monitors the evolution of resistant species and assesses their impact. All confirmed instances of new cases are listed. Synonyms: resistant weed, resistance, resistant weeds
Ridge till

Description

A tillage system involving scalping and planting on ridges built during cultivation of the previous year's crop, residue is left on the surface between ridges.

Authoritative On-line References and Resources

Purdue University-based Conservation Technology Information Centre.
Row crop

Description

Annual crops traditionally grown in wide rows such as corn, soybeans and cotton.

Authoritative On-line References and Resources

The US national associations for those involved in the production of, and trade in, corn, soybeans and cotton:  http://www.ncga.com http://www.soygrowers.com http://www.cotton.org  Synonyms: row crops
Run-off

Description

The occurrence of surplus liquid (like rain) which originates up-slope and is collected beyond the ability of the soil to absorb it. The surplus liquid then flows away over the surface to reach the nearest surface water (pond, lake, river).

Authoritative On-line References and Resources

US Geological Survey's Water Science School Synonyms: run off, runoff