Effect of Atrazine on Soil Transformations of Nitrogen and Uptake by Corn1
- Stefano Cervelli,
- Carlo Ciardi and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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