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VCRB :: Contents of Volume 60/2004 :: Detailed information


DEGRADATION OF PHENMEDIPHAM IN SOIL
UNDER LABORATORY CONDITIONS


Mariusz KUCHARSKI
Institute of Soil Science and Plant Cultivation Orzechowa 61, 50-540 Wrocław, Poland e-mail: m.kucharski@iungwr.neostrada.pl


Summary

The influence of soil type and adjuvants addition on degradation rate of phenmedipham was studied under laboratory conditions. Two kinds of soil samples were placed in growth chambers. Phenmedipham was applied at the dose of 800 g·ha-1 alone and in mixture with 1.5 L·ha-1 of adjuvants - Olbras(r) 88 EC and Olejan(r) 85 EC.
Soil samples were taken to analysis 1 hour (initial concentration) and 1, 3, 6, 12, 21, 36, 54, 72, 90 and 120 days after treatment.
Residues of phenmedipham were determined using high performance liquid chromatography with UV-detection.
The DT50 values were 9 days for the medium silty loam soil and 23 days for the heavy loamy sand soil. 120 days after application, phenmedipham residue amountsed to 0.038 mg·kg-1 (6% of initial dose) for medium silty loam soil and respectively 0.029 mg·kg-1 (4.5%) for heavy loamy sand soil.
The addition of adjuvants decreased the degradation of phenmedipham in both types of soil. The DT50 value for mixture of phenmedipham + adjuvants was 5-10 days higher for medium silty loam soil and 3-7 days for heavy loamy sand soil in comparison with DT50 for phenmedipham applied alone. Final residues of phenmedipham (120 days after treatment) on objects with adjuvants reached 0.044 mg·kg-1 (adjuvant Olbras 88 EC) and 0.042 mg·kg-1 (adjuvant Olejan 85 EC) for the medium silty loam soil and respectively 0.033 and 0.031 mg·kg-1 for heavy loamy sand soil.


keywords:phenmedipham, adjuvant, degradation rate in soil, residue, DT50

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