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This article in JEQ

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



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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