Impact des produits phytosanitaires sur quelques microorganismes du sol cultivé par la pomme de terre (Solanum tuberosum L. var Sylvana).

Abstract

Phytosanitary products are used in agriculture to protect the crop from harmful organisms but can have undesirable side effects on the environment. The work undertaken focused on soil aspect, precisely the impact of plant protection products applied at two different doses on the growth of soil microflora (bacteria and fungi). The results obtained showed that the application of the first dose has a significant effect on the decrease of bacterial and fungal populations of the order of 28% and 48%, respectively. These results are confirmed by the values recorded with the NPP technique (23%) and the microbial biomass technique (47%). The application of dose 2 increased this microbial decrease to 50% and 67%, respectively. On the other hand, the solid medium enumeration technique revealed slightly higher microbial densities (bacterial and fungal) than that observed for the control. These results affirm that plant protection products act on soil microflora because its increase and decrease reflect a disruption of its activity.