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Effects of biochar amendment on sorption, dissipation, and uptake of fenamiphos and cadusafos nematicides in sandy soil
Author(s) -
Abdel Ghani Sherif B,
AlRehiayani Suloiman,
El Agamy Moustafa,
Lucini Luigi
Publication year - 2018
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.5075
Subject(s) - biochar , sorption , amendment , chemistry , soil water , bioavailability , environmental chemistry , freundlich equation , horticulture , meloidogyne incognita , pesticide , agronomy , adsorption , biology , environmental science , soil science , pyrolysis , ecology , bioinformatics , organic chemistry , political science , nematode , law
BACKGROUND The application of biochar to soil is supposed to alter its adsorption/desorption potential toward pesticides, thereby affecting their bioavailability and efficacy. This is particularly relevant in the case of nematicides because these pesticides are directly applied to soil. RESULTS Biochar was produced from date palm (PB) and eucalyptus (EB) waste at 450 °C and added at a rate of 1% to a sandy soil. The half‐life ( t ½ ) of fenamiphos was increased from 2.7 to 18.3 and 18.6 days in PB‐ and EB‐amended soils, respectively. By contrast, the half‐life of cadusafos was unaffected. Freundlich K f values increased from 1.22 and 0.39 (μg 1– N f g −1 mL N f ) to 4.49 and 6.84 in 1% PB‐amended soil, and to 3.49 and 4.62 in 1% EB‐amended soil for cadusafos and fenamiphos, respectively. Plant uptake of both nematicides in tomato seedlings was reduced by approximately 97% (cadusafos) and 85% (fenamiphos). Although nematicide efficacy against Meloidogyne incognita was not altered at the recommended dosage, it was negatively affected at a half‐dose rate. Under these conditions, it decreased from 43.1% in unamended sandy soil to only 18.3% in 1% PB‐amended soil. CONCLUSIONS Biochar addition increased the sorption capacity of soil. This resulted in a decrease of nematicide bioavailability, together with a reduction of both the dissipation rate and uptake by tomato plants. © 2018 Society of Chemical Industry