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This article in JEQ

  1. Vol. 11 No. 1, p. 82-86
    Received: Aug 16, 1980

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Effect of Atrazine on Soil Transformations of Nitrogen and Uptake by Corn1

  1. Stefano Cervelli,
  2. Carlo Ciardi and
  3. Amalia Perna2



The influence of different rates of atrazine (2-chloro-4-[ethylamino]-6-[isopropylamino]-s-triazine) (0,2, and 6 kg ha−1) on nitrogen balance and soil urease following 15N-urea fertilization (200 kg ha−1) was investigated in corn (Zea mays L.) plots by emission spectrometry. Urease activity was affected by both urea and atrazine applications. Concentrations of NH4+-N and NO3-N in soil were greater at the highest herbicide rate. Organic N buildup was slower in plots that received atrazine at the highest rate, but at the end of the cropping season the total amount of organic N was similar for all treatments.

Nitrogen losses, as determined by an N balance sheet, were 51, 32, and 22% of added N in the plots treated with 0, 2, and 6 kg ha−1 of atrazine, respectively.

The main role of organic N in the N cycle of the soil-plant environment in the presence of atrazine is suggested.

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