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Absorption of Herbicides by Soybean Seed

Published online by Cambridge University Press:  12 June 2017

H. Don Scott  and
Ronald E. Phillips
H. Don Scott
Affiliation:
Dep. of Agron., Univ. of Arkansas 72701
Ronald E. Phillips
Affiliation:
Dep. of Agron., Univ. of Kentucky 40506
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Abstract

The absorption of 14C-labeled herbicides by soybean (Glycine max (L.) Merr. ‘Lee’) seed from aqueous solutions and treated soil was investigated. A comparison of the absorption of the various herbicides from aqueous solution showed that differences existed in the rate and amount of herbicide absorbed by the seed. Calculations showed that the concentration of herbicides at the seed coat surface varied with absorption time which indicated that the permeability of the soybean seed to these herbicides changed during the absorption process. The rate of absorption of isopropyl m-chlorocarbanilate (chlorpropham) and 2-chloro-4-(ethylamino)-6-(iso propylamino)-s-triazine (atrazine) by soybean seed in soil was rapid for the first 4 hr and then decreased steadily until the event of germination at which time the rate increased. When the amount absorbed by the soybean was compared with that predicted by the perfect sink equation, it was found that the soybean was a better sink during the first few hours than afterwards. The amount of herbicide moved to the seed in the imbibed water could not account for the total amount of chlorpropham absorbed indicating considerable contributions from diffusive transport. Only during the initial 4-hr period was uptake of atrazine greater than that moved to the seed by mass flow.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 1 , January 1973 , pp. 71 - 76
Copyright
Copyright © 1973 Weed Science Society of America 

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References

Literature Cited

1. Phillips, R. E. 1968. Water diffusivity of germinating soybean, corn, and cotton seed. Agron. J. 60:568–571.CrossRefGoogle Scholar
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6. Weed Society of America. 1970. Herbicide Handbook. Humphrey Press, Geneva, New York, 293 p.Google Scholar