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Impact of Preceding Crop and Cultural Practices on Rye Growth in Winter Wheat

Published online by Cambridge University Press:  20 January 2017

Randy L. Anderson
Randy L. Anderson*
Affiliation:
U.S. Department of Agriculture—Agricultural Research Service, 2923 Medary Avenue, Brookings, SD 57006
*
Corresponding author's E-mail: [email protected].
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Abstract

Improving crop vigor can suppress growth of weeds present in the crop. This study examined the impact of preceding crop and cultural practices on rye growth in winter wheat. Preceding crops were soybean, spring wheat, and an oat/dry pea mixture. Two cultural treatments in winter wheat were also compared, referred to as conventional and competitive canopies. The competitive canopy differed from the conventional in that the seeding rate was 67% higher and starter fertilizer was banded with the seed. The study was conducted at Brookings, SD. Rye seed and biomass production differed fourfold among treatments, with winter wheat following oat/pea being most suppressive of rye growth. Rye produced 63 seeds/plant in winter wheat with a competitive canopy that followed oat/pea, contrasting with 273 seeds/plant in conventional winter wheat following spring wheat. Yield loss in winter wheat due to rye interference increased with rye biomass, but winter wheat was more tolerant of rye interference following oat/pea compared with the other preceding crops. Regression analysis indicated that winter wheat yield loss at the same rye biomass was threefold higher following spring wheat or soybean compared with oat/pea as a preceding crop. Winter wheat competitiveness and tolerance to rye can be improved by increasing the seeding rate, using a starter fertilizer, and growing winter wheat after an oat/pea mixture.

Keywords

Dry pea, Pisum sativum L.oat, Avena sativa L.rye, Secale cereale L.soybean, Glycine max (L.) Merrwheat, Triticum aestivum L.Population dynamicsseed productionsynergismsystems design
Type
Research Article
Information
Weed Technology , Volume 23 , Issue 4 , December 2009 , pp. 564 - 568
Copyright
Copyright © Weed Science Society of America 

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