Atrazine mineralisation in New Zealand topsoils and subsoils: influence of edaphic factors and numbers of atrazine-degrading microbes

Sparling, G.P.; Dragten, Robert; Aislabie, Jackie; Fraser, Rhonda

doi:10.1071/s97065

Cited by 36 publications

(39 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in irrigated plots DT 50 values from the whole soil profile (0-90 cm) and at 0-15 cm soil layer were the same, indicating that the herbicide degradation was not reduced with soil depth (Di et al, 1998;Sparling et al, 1998;Karpouzas et al, 2001). This is supported by the low K d and high desorption percentage determined in the soil profile (Table 4).…”

Section: Resultssupporting

confidence: 69%

Rainfall effect on dissipation and movement of diuron and simazine in a vineyard soil

Alister

Kogan

2010

Planta daninha

View full text Add to dashboard Cite

-From 2003 to 2007, a field study was performed in a vineyard in Chile to investigate diuron and simazine soil behavior and the effect of additional rainfall. Both herbicides were applied once a year at a rate of 2.0 kg ha -1 a.i. Herbicide concentrations in soil were measured at 0, 10, 20, 40, 90 and 340 days after application, under two pluviometric conditions, natural rainfall and natural rainfall plus irrigation with 180 mm of simulated rainfall during the first 90 days after application. Soil partition coefficient (K d ) varied in the soil profile (0 to 90 cm deep) from 6.75 to 2.04 mL g -1 and from 1.4 to 0.66 mL g -1 and the maximum soil adsorption capacity was approximately 18.3 mg g -1 and 8.3 mg g -1 for diuron and simazine, respectively. Diuron and simazine reached up to 90 and 120 cm of soil depth, with an average of 8.3% and 62.4% of herbicide moved below 15 cm in the soil, respectively. Simazine soil half-life (DT 50 ) was 38.1 days and 7.5 days, whereas the half life for diuron varied from 68.0 and 24.6 for natural rainfall and irrigated, respectively. The average of residual simazine remaining in the whole soil profile after 90 DAA was 25.4% and 39.9% for diuron, with no effect of additional rainfall amount. At 340 DAA the amount of simazine in the whole soil profile corresponded to 13.2% of the initial amount applied, being diuron more persistent with 21.5% of the initial herbicide applied. The high movement in soil of both herbicides could be due to a non-equilibrium sorption process explained by preferential flow, low K d and high desorption.RESUMO -Entre 2003 e 2007, foi conduzido um estudo de campo em uma vinha no Chile para investigar o comportamento de diuron e simazine no solo e o efeito de irrigação extra. Ambos os herbicidas foram aplicados uma vez por ano, numa base de 2.0 kg ha -1 a.i. Foram medidas as concentrações de herbicida no solo após 0, 10, 20, 40, 90 e 340 dias da aplicação, sob duas condições pluviométricas distintas, chuvas naturais e chuvas naturais mais irrigação com 180 mm de chuva artificial durante os primeiros 90 dias após a aplicação. O coeficiente de partição no solo (K d ) no perfil de solo (a uma profundidade de 0 a 90 cm) foi de 2.04 mL g -1 e de 1,4 a 0,66 mL g -1 , e a capacidade de adsorção máxima do solo foi de aproximadamente 18,3 mg g -1 e 8.3 mg g -1 para diuron e simazine respectivamente. O diuron e o simazine atingiram uma profundidade de até 90 e 120 cm no solo, com uma média de, respectivamente, 8,3% e 62,4% de movimentação do herbicida abaixo de 15 cm do solo. A meia-vida de simazine no solo (DT 50 ) foi de 38,1 dias e 7,5 dias, enquanto a meia-vida para o diuron foi de 68,0 e 24,6, com chuva natural e irrigação respectivamente. A média de simazine residual remanescente em todo o perfil do solo após 90 DAA foi de 25,4%, e de 39,9% para o diuron, sem nenhum efeito de quantidade de chuva adicional. Em 340 DAA, a quantidade de simazine presente em todo o perfil do solo correspondeu a 13,2% da quantidade inicial aplicada, sendo o diuron mais pers...

show abstract

Section: Resultssupporting

confidence: 69%

Rainfall effect on dissipation and movement of diuron and simazine in a vineyard soil

Alister

Kogan

2010

Planta daninha

View full text Add to dashboard Cite

show abstract

“…It is conceivable that within one soil type, different layers may contain different microbial populations that are preferential degraders of different pesticides. [12] In addition, the combined effect of sorption and degradation are also influenced by the organic carbon content and other mineral constituents present within the soil depth, which can have an interactive effect on overall degradation process. Given the complex interaction between the sorption and degradation, the lack of consistent protocol often renders a global approach to obtain DT 50 values for different pesticides unrealistic.…”

Section: Resultsmentioning

confidence: 99%

“…Organic C in the extracts was measured by Shimadzu 5000 TOC analyzer and the flush of C (difference between fumigated and non-fumigated soils) converted to microbial biomass using a KEC (extractable part of microbial biomass carbon after fumigation) factor of 0.41. [12] Analytical grade atrazine (98%), bromacil (99.5%), hexazinone (99%), diazinon (97.5%), procymidone (98%) and terbuthylazine (99.5%) were purchased from Dr Ehrenstorfer, Germany. The structure and chemical properties of these compounds are given in Table 2.…”

Section: Soils and Pesticidesmentioning

confidence: 99%

Dissipation and sorption of six commonly used pesticides in two contrasting soils of New Zealand

Sarmah¹,

Close²,

Mason³

2009

Journal of Environmental Science and Health, Part B

View full text Add to dashboard Cite

We investigated dissipation and sorption of atrazine, terbuthylazine, bromacil, diazinon, hexazinone and procymidone in two contrasting New Zealand soils (0-10 cm and 40-50 cm) under controlled laboratory conditions. The six pesticides showed marked differences in their degradation rates in both top-and subsoils, and the estimated DT 50 values for the compounds were: 19-120 (atrazine), 10-36 (terbuthylazine), 12-46 (bromacil), 7-25 (diazinon), 8-92 (hexazinone) and 13-60 days for procymidone. Diazinon had the lowest range for DT 50 values, while bromacil and hexazinone gave the highest DT 50 values under any given condition on any soil type. Batch derived effective distribution coefficient (K eff d ) values for the pesticides varied markedly with bromacil and hexazinone exhibiting low sorption affinity for the soils at either depth, while diazinon gave high sorption values. Comparison of pesticide degradation in sterile and non-sterile soils suggests that microbial degradation was the major dissipation pathway for all six compounds, although little influence of abiotic degradation was noticeable for diazinon and procymidone.

show abstract

“…The differences between these two soils were observed not only in the solute adsorption process but also in other characteristics. For example, Sparling et al (1998) found that while there was a marked decline in atrazine degradation with depth in Te Awa soil, the amount of degradation in the C horizon was only slightly less than the A horizon in Twyford soil. However, the pattern of degradation differed in the Twyford subsoil, which showed a higher rate of atrazine degradation than Te Awa soil.…”

mentioning

confidence: 99%

“…Large surface areas are associated with organic matter and clay, and hence influence adsorption. Sparling et al (1998) reported relative surface areas for the Te Awa and Twyford samples used in this experiment. Using the Freundlich Kf values as a criterion of adsorption, we found a reasonable relationship between atrazine adsorption and some properties, such as clay fraction (%), cation exchange capacity (CEC), and surface area (Fig.…”

mentioning

confidence: 99%

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

Magesan

Bolan

Lee

2003

New Zealand Journal of Agricultural Research

View full text Add to dashboard Cite

Quantification of soil processes, such as adsorption, is needed for predicting the fate of agricultural chemicals in soils. Adsorption is affected by soil properties, which vary with depth. We conducted a laboratory study to determine the influence of soil depth on the adsorption of an organic solute (atrazine) in both allophanic and non-allophanic soils, and an inorganic solute (phosphate) in two non-allophanic soils. Adsorption isotherms of atrazine and phosphate were determined using 14 C-labelled atrazine and KH 2 PO 4 , respectively, in batch equilibrium. The adsorption isotherms for atrazine were almost linear, and adequately described by the Freundlich equation. For phosphate the adsorption isotherms exhibited substantially more curvature and were best described by the Langmuir equation for one of the soils. Generally, adsorption of both solutes decreased with depth. While atrazine adsorption appeared related to such factors as percentage clay content, total C, cation exchange capacity (CEC), and surface area, no similar relationships appeared apparent for phosphate adsorption.

show abstract

Atrazine mineralisation in New Zealand topsoils and subsoils: influence of edaphic factors and numbers of atrazine-degrading microbes

Cited by 36 publications

References 0 publications

Rainfall effect on dissipation and movement of diuron and simazine in a vineyard soil

Rainfall effect on dissipation and movement of diuron and simazine in a vineyard soil

Dissipation and sorption of six commonly used pesticides in two contrasting soils of New Zealand

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

Contact Info

Product

Resources

About