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This article in AJ

  1. Vol. 71 No. 1, p. 24-26
     
    Received: Oct 31, 1977


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doi:10.2134/agronj1979.00021962007100010006x

Alachlor and Trifluralin Effects on Nutrient Uptake in Oats and Soybeans1

  1. D. L. Bucholtz and
  2. T. L. Lavy2

Abstract

Abstract

Alachlor [2-chloro-2′,6′-diethyl-N-(methoxymethyl)acetanilide] and trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) have been reported by several investigators to inhibit root growth in a variety ot plants. However, the biochemical significance of this inhibition is not known. The inhibition of root growth could interfere wth the uptake of plant nutrients. The greenhouse experiments of the present study were conducted to determine what effects the herbicides, alachlor and trifluralin have on the growth and on the uptake of H32PO2−4 and 35SO2−4 of oats (Avena sativa L. ‘Neal’) and soybeans [Glycine max (L.) Merr. ‘Clark 63’]. Oats is regarded as an alachlor and trifluralin-sensitive species, and soybean is regarded as an alachlor and triflurafin-tolerant species. Root weight of both species was reduced with increasing concentrations of both soil-incorporated herbicides. The reduced root biomass of soybean was accompanied by a proportional reduction in shoot biomass, but in oats the shoot biomass was reduced more than the root biomass. Root biomass and the accumulation of H32PO2−4 and 35SO2−4 in oat and soybean shoots were directly correlated.

Alachlor and trifluralin altered biochemical processes in oats and soybeans which control root and shoot growth. The herbicides selectively altered the plants' abilities to absorb H32PO2−4 and 35SO2−4.

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