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Separating the Effects of Sorghum (Sorghum bicolor) and Rye (Secale cereale) Root and Shoot Residues on Weed Development

Published online by Cambridge University Press:  12 June 2017

Melinda L. Hoffman ,
Leslie A. Weston ,
John C. Snyder  and
Emilie E. Regnier
Melinda L. Hoffman
Affiliation:
Dep. Hortic., Univ. of Kentucky, Lexington, KY 40546
Leslie A. Weston
Affiliation:
Dep. Hortic., Univ. of Kentucky, Lexington, KY 40546
John C. Snyder
Affiliation:
Dep. Agron., The Ohio State Univ., Columbus, OH 43210
Emilie E. Regnier
Affiliation:
Dep. Agron., The Ohio State Univ., Columbus, OH 43210
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Abstract

Greenhouse experiments that used capillary mat subirrigation to maintain constant soil moisture and to supply fertilizer continuously were conducted to evaluate the effects of sorghum or rye residue on early growth of barnyardgrass and velvetleaf. The separate effects of root residue and of shoot residue were compared to the combined effects of root plus shoot residues and to an uncovered soil control. Residues included as nontoxic controls were leached shoot tissue and poplar excelsior. Shoot residue, leached shoot tissue, and poplar excelsior were surface-applied on an equal light transmittance basis such that mass of poplar excelsior > shoot residue > leached shoot tissue. The presence of rye root residue delayed emergence of barnyardgrass. Surface-applied residues tended to decrease barnyardgrass height, but velvetleaf stem length was greater in treatments with surface residue. Although cover crop shoot residues had little effect on weed growth after 18 d, weed growth decreased in the presence of cover crop root residues and poplar excelsior.

Keywords

Barnyardgrass, Echinochloa crus-galli L. ♯ ECHCGvelvetleaf, Abutilon theophrasti Medicus ♯ ABUTHrye, Secale cereale L. ‘Wheeler’sorghum, Sorghum bicolor (L.) Moench ‘Pioneer Hybrid #8333.’Capillary mat subirrigationcover cropallelopathyphysical effects
Type
Special Topics
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 402 - 407
Copyright
Copyright © 1996 by the Weed Science Society of America 

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References

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