Insecticides transformation in soil under different meteorological conditions
1985
Bakovic, M. (Institut za primenu nuklearne energije u poljoprivredi, veterinarstvu i sumarstvu | Beograd (Yugoslavia). OOUR Zavod za pesticide) | Peric, I. | Milosevski, N.
In the several years lasting investigation of degradation dynamics and mobility of some insecticides in soil, at the same locality, as for instance forat (o,o diethyl S-(ethyl thio) methyl phosphorodithioate) and lindan (gamma isomer 1,2,3,4,5,6 - hexachlorcyclohexane) were established some factors important for their appliance. Moisture effect and soil temperature were widely varying when forat was applied to the same type of soil and same quantity. Dynamics of forat degradation and stability of their metabolites differentiated very much during the period of 4 year investigation. The total quantity of forat and metabolite in the layer of the treated soil was also varying in the different intervals of time, as well as in the appliance within each year. During the period of 4 year investigation, the varying of total content of phosphorus and metabolite, after 6 months appliance in the upper layer of the soil was even 20 times, while in the lower layer not more than 4 times. The velocity of toxical metabolite construction and the share of each compound in the total content were also different. But, the compound mobility in some way was similar in all investigated periods. The most mobile compounds in soil were forat, sulphonium or forat sulphoxide, in dependence on degradation intensity. The changes of climate conditions had a great effect on the process of insecticide adsorbtion and desorbtion in soil.
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