Degradation dynamics of azadirachtin in cabbage and soil

YANG Xiaoyun; HUANG Qiliang; JIANG Tenghui; XU Hanhong

doi:10.7671/j.issn.1001-411X.2017.04.006

Journal of South China Agricultural University > 2017 > 38(4): 38-40. > DOI: 10.7671/j.issn.1001-411X.2017.04.006

YANG Xiaoyun, HUANG Qiliang, JIANG Tenghui, XU Hanhong. Degradation dynamics of azadirachtin in cabbage and soil[J]. Journal of South China Agricultural University, 2017, 38(4): 38-40. DOI: 10.7671/j.issn.1001-411X.2017.04.006

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Degradation dynamics of azadirachtin in cabbage and soil

1.
Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education/College of griculture, South China Agricultural University, Guangzhou 510642, China
2.
Guangdong Vocational and Technotogical School of Environmental Protection, Guangzhou 510655, China
3.
Agricultural Pest Prevention and Control Center of Guangdong Province, Guangzhou 510500, China

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Received Date: March 01, 2017
Available Online: May 17, 2023

Graphical Abstract

Abstract

Abstract

Objective
To identify the residual and degradation dynamics of azadirachtin in cabbage and soil after spraying 0.3%azadirachtin emulsifiable concentrate during the growth period of cabbage (Brassica oleracea).
Method
Azadirachtin was added with three concentrations of 0.1, 0.5 and 1.0 mg·kg^-1 within the range from 0.05 to 5.00 mg·kg^-1. Azadirachtin was extracted from cabbage and soil using acetonitrile assisted with ultrasonic, purificated using a florisil solid phase extraction column, detected by HPLC and quantified by external standard method.
Result
The average recovery rates of azadirachtin in cabbage ranged from 88.52% to 93.21% with relative standard deviations ranging from 2.75% to 3.55%, and the average recovery rates in soil were ranged from 90.69% to 93.32% with relative standard deviations ranging from 2.09% to 3.46%.The half-lives of azadirachtin in cabbage and soil were 0.89 and 2.40 d respectively.
Conclusion
Azadirachtin is an easily degradable pesticide. Application of 0.3% azadirachtine mulsifiable concentrate is safe and recommended.
- azadirachtin,
- emulsifiable concentrate,
- cabbage,
- soil,
- pesticide residue,
- HPLC

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