Résumé:
This work is a contribution to the evaluation of the persistence of the herbicide glyphosate in vegetable crops based on physico-chemical characteristics of the soil.
Soil samples with increased crops inside greenhouses and untreated soil outside of greenhouses are taken in two places of Jijel. The persistence of the herbicide was evaluated by the use of a biological test applied to radish (Raphanus sativus L.) which is selected as a test plant.
The results obtained in pots showed a delay in seedling emergence in soil collected inside greenhouses, and a decrease in the number of seedlings for the same soil, and this according to the date of application of product, the soil and the soil horizon considered.
In the first test for soil of Jimar, if sowing is practiced in soils taken from inside greenhouses after a short period of time of herbicide application (15 days) , a delay is recorded lift and lower the number of seedlings raised at the first horizon 0-10 cm for the first greenhouse in the three horizons for the second emissions. If seeding is performed after a longer time (1 month), delayed emergence and reduced number of seedlings in deep horizons 20-30 cm for soils of Jimar which are mostly silty clay soil was observed -sandy or sandy loam to some. While after three months, the same results were observed at the horizon 10 -20 cm in soils of El-Kennar which are sandy loam soils in the majority and silty clay and sand for the rest.
These results emerge as a result of the herbicide that is not retained by the non-clay soils low in organic matter, two components that should adsorb glyphosate and make it little bit mobile and inactif.
We must indicate that the biological test is not sufficient on its own. It must be supported by chemical analysis to confirm the persistence of this herbicide.
