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Effects of Seven Herbicides on N2 (C2 H2) Fixation by Soybeans

Published online by Cambridge University Press:  12 June 2017

Patrick K. Bollich ,
Edward P. Dunigan  and
A. Wahid M. Jadi
Patrick K. Bollich
Affiliation:
Agron. Dep., Louisiana Agric. Exp. Stn., Louisiana State Univ., Baton Rouge, LA 70803
Edward P. Dunigan
Affiliation:
Agron. Dep., Louisiana Agric. Exp. Stn., Louisiana State Univ., Baton Rouge, LA 70803
A. Wahid M. Jadi
Affiliation:
Agron. Dep., Louisiana Agric. Exp. Stn., Louisiana State Univ., Baton Rouge, LA 70803
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Abstract

Greenhouse and laboratory investigations using four soils were conducted to determine the influence of seven herbicides on symbiotic nitrogen (N2) fixation by soybeans [Glycine max (L.) Merr. ‘Davis’]. Soils were treated with recommended rates of herbicides immediately after planting. After 8 to 10 weeks the nodulated root systems were assayed for nitrogenase activity using the acetylene (C2H2) to ethylene (C2H4) reduction technique, and total numbers and dry weights of nodules were determined. Metribuzin [4-amino-6-tert-butyl-3-(methylthio)-as-triazin-5(4H)-one] (0.3 kg/ha) decreased nodule dry weight and C2H4 production per plant per hour in a Convent sandy loam. Alachlor [2-chloro-2’,6’-diethyl-N-(methoxymethyl) acetanilide] (2.2 kg/ha) and prometryn [2,4-bis(isopropylamino)-6-(methylthio)-s-triazine] (0.6 kg/ha) also decreased C2H4 production per plant per hour in a Convent sandy loam, while metribuzin (0.6 kg/ha) increased C2H4 production per plant per hour and per milligram of nodule dry weight in a Mhoon silt loam. Prometryn (1.7 kg/ha) increased production of C2H4 per plant per hour in a Moreland silt loam. None of the herbicides affected C2H4 production, nodule number, or nodule dry weight in a Commerce silt loam.

Keywords

Nodulationnitrogenaseacetylene reductionalachlordipropetrynlinuronmetribuzinprometryntrifluralinvernolateGlycine maxRhizobium japonicum
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 4 , July 1985 , pp. 427 - 430
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

Literature Cited

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