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The National Agricultural Library is one of four national libraries of the United States, with locations in Beltsville, Maryland and Washington, D.C. It houses one of the world's largest and most accessible agricultural information collections and serves as the nexus for a national network of state land-grant and U.S. Department of Agriculture field libraries. In fiscal year 2011 (Oct 2010 through Sept 2011) NAL delivered more than 100 million direct customer service transactions.

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Journal Article

Journal Article

Economic and interference threshold densities of quackgrass (Elytrigia repens) in potato (Solanum tuberosum)  [1998]

Baziramakenga, R. (Soils and Crops Development and Research Centre, Sainte-Foy, Quebec, Canada.); Leroux, G.D.;

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Field studies were conducted in 1989 and 1990 at St.-Augustin, Quebec, Canada, to determine the economic threshold density of quackgrass in potato. Potato yield losses due to quackgrass interference increased with quackgrass population density. Potato yield ranged from 33 to 73% in 1989, and from 19 to 44% in 1990. The relationship between potato yield losses and quackgrass densities was described by a rectangular hyperbolic function. Dry weight of quackgrass proved to be the best predictor of potato yield loss compared to shoot number. The interference thresholds for 10% potato yield loss amounted to 25 shoots m(-2) or 20 g total dry biomass m(-2). The economic threshold varied between 0.04 and 2 shoots m(-2) or 0.0165 and 1.5 g total dry biomass m(-2), depending on the variables considered
From the journal
Weed science (USA)
ISSN : 0043-1745

Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1999
Volume:
46
Issue:
2
Start Page:
176
End Page:
180
All titles:
"Economic and interference threshold densities of quackgrass (Elytrigia repens) in potato (Solanum tuberosum)"@eng
Other:
"references"
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Bibliographic information

Language:
English
Type:
Journal Article
In AGRIS since:
1999
Volume:
46
Issue:
2
Start Page:
176
End Page:
180
All titles:
"Economic and interference threshold densities of quackgrass (Elytrigia repens) in potato (Solanum tuberosum)"@eng
Other:
"references"