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Ethephon Reduction of Redroot Pigweed (Amaranthus retroflexus) Seed Populations

Published online by Cambridge University Press:  12 June 2017

Grant H. Egley
Grant H. Egley*
Affiliation:
U.S. Dep. Agric., Agric. Res. Serv., South. Weed Sci. Lab., Stoneville, MS 38776
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Abstract

Freshly collected redroot pigweed seeds were buried 5 cm deep in the field in November of 3 yr in succession. Treatments applied to the soil surface included KNO3 (400 kg ha-1) in midwinter, ethephon (11 kg ha-1) in late spring, and a soil cover (polyethylene sheet for 2 wk) in late spring. Seeds were recovered within 1 yr after treatment, examined for in situ germination, and tested for viability. The 3-yr averages for viable seeds remaining by October in the year after treatment with KNO3 or soil cover, either alone or in combination, did not differ from nontreated checks and averaged 47% of the original population. Viable seeds remaining in soil treated with ethephon either alone or combined with KNO3 were reduced to 21% of the beginning population. The most effective treatments were ethephon either combined with a soil cover or with a soil cover plus KNO3 which reduced the viable seeds to an average of 8% of the original. Ethephon plus a soil cover has the potential to reduce greatly redroot pigweed seed populations in the field.

Keywords

Ethephon, (2-chloroethyl)phosphonic acidredroot pigweed, Amaranthus retroflexus L. ♯3 AMAREDormancygerminationseed longevitysoil mulchweed seed bankethylenenitrate
Type
Research
Information
Weed Technology , Volume 4 , Issue 4 , December 1990 , pp. 808 - 813
Copyright
Copyright © 1990 Weed Science Society of America 

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