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Horticulture Principles and Practices

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Integrated cultural, physical, <strong>and</strong> chemical weed control methods are utilized at the cropping<br />

system level by many Oklahoma farmers. Weed control methods on WillCrest Farms in<br />

Payne County Oklahoma have been changed from conventional weed control to an integrated<br />

pest management scheme in the last five years as a part of converting their entire farming<br />

venture from conventional tillage to no-till. Their cropping system has transitioned from a<br />

monoculture based system to a rotational system that produces three crops in two years that<br />

allows the l<strong>and</strong> to lay fallow for one growing season. The crops in the rotation are Milo, Wheat<br />

<strong>and</strong> Corn. A broadleaf crop was been added to the rotation in 2007 to enhance the control of<br />

grass type weeds. A pre-planting burn-down is done with Roundup before drilling in the new<br />

crop. A crop consultant has also been retained who makes recommendations based on weekly<br />

surveys.<br />

Sources<br />

Agricultural resource service<br />

University of Florida Extension<br />

Burnside, O.C., Orf, J.H., <strong>and</strong> Pester, T.A., 1999. Journal of Crop Production:<br />

agricultural management in global context Volume: 2 Issue: 1 ISSN: 1092-<br />

678X<br />

Shaner, D.L., 2004. Precision Weed Management: The wave of the future or just<br />

a passing fad? Phytoparasitica. 32:107-110<br />

Personal communication: Clark Williams. 2007<br />

Additional information<br />

http://www.websters-online-dictionary.org/<br />

http://www.nal.usda.gov/<br />

http://edis.ifas.ufl.edu/WG041<br />

http://www.oznet.ksu.edu/weedmanagement/<br />

http://www.weeds.iastate.edu/<br />

http://plants.usda.gov/<br />

7. Common cocklebur (Xanthium pensylvanicum). Cocklebur is a monoecious<br />

annual weed. Its stem is hairy <strong>and</strong> the taproot system strong <strong>and</strong> branched.<br />

It may attain 90 centimeters in height under certain conditions <strong>and</strong> reproduces<br />

by seed.<br />

8. Redroot pigweed (Amaranthus retroflexus). Redroot pigweed has a<br />

shallow taproot system <strong>and</strong> green flowers borne in dense panicles at<br />

the end of the stem <strong>and</strong> branches. Under certain conditions, it may grow as<br />

tall as 200 centimeters.<br />

9. Large crabgrass (Digitaria sanguinalis). An annual grassy weed, large crabgrass<br />

is a problem in most parts of the United States. It is found in lawns <strong>and</strong> cultivated<br />

areas <strong>and</strong> has a dense, fibrous root system.<br />

10. Smooth crabgrass (Digitaria ischaemum). Crabgrass is an annual <strong>and</strong> a common<br />

lawn weed in most parts of the United States.<br />

7.3 Selected Common Weeds 221

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