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Weed suppression with Brassica green manure crops in green pea

Published online by Cambridge University Press:  12 June 2017

Kassim Al-Khatib ,
Carl Libbey  and
Rick Boydston
Carl Libbey
Affiliation:
N.W. Research, Extension Center, Washington State University, Mt. Vernon, WA 98273
Rick Boydston
Affiliation:
Agricultural Research Services, U.S. Department of Agriculture, Prosser, WA 99350-9687
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Abstract

Weed suppression in green pea was evaluated when green pea was planted after a fall planting of rapeseed, white mustard, rye, or wheat had been incorporated into the soil in spring. Tests were conducted at Mount Vernon, WA, in 1994 and 1995. Weed suppression in peas varied between different green manure crops. One month after planting, the highest weed population was in green pea following wheat, whereas the lowest was in green pea following rapeseed. Rye and white mustard suppressed early weeds relative to wheat by 25 and 30%, respectively. However, at harvest, weed density was similar in green pea planted after all green manure crops. Weed suppression improved when cultivation or metribuzin at 0.14 kg ha−1 was used in combination with white mustard, rapeseed, or rye. Pea population was not affected by green manure crops, except for rapeseed, which reduced pea population. In greenhouse experiments, white mustard added to the soil at 20 g per 400 g air dry soil reduced emergence of shepherd's-purse, kochia, and green foxtail by 97, 54, and 49%, respectively. Rapeseed suppressed emergence of shepherd's-purse, kochia, and green foxtail by 76, 25, and 25%, respectively.

Keywords

Metribuzin [4-amino-6-(1,1-dimethylethyl)-3-methylthio)-1,2,4-triazin-5(4/H)-one]common chickweed, Stellaria media (L.) Vill. STEMEgreen foxtail, Setaria viridis (L.) Beauv. SETVIkochia, Kochia scoparia (L.) Schrad. KCHSCshepherd's purse, Capsella bursa-pastoris (L.) Medicus CAPBPgreen pea, Pisum sativum L. ‘Bolero’rapeseed, Brassica napus L. ‘Jupiter’rye, Secale cereale L. ‘Wheeler’wheat, Triticum aestivum L. ‘Cashup’white mustard, Brassica hirta Moench ‘Martigena’CultivationisothiocyanatesSTEMESETVIKCHSCCAPBP
Type
Weed Management
Information
Weed Science , Volume 45 , Issue 3 , June 1997 , pp. 439 - 445
Copyright
Copyright © 1997 by the Weed Science Society of America 

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