Biodegradation of herbicides by Pseudomonas aeruginosa in two soils types of the Bou Namoussa irrigable perimeter (Algerian Extreme Northeast): Effects on mineral nutrition (P2O5 and NO3 -).

The high use of both herbicides (the glyphosate and 2.4-d) from 1968 on one side and on other side,the needs in phosphorus and nitrogen (p and n) in irrigable perimeter soils of bounamoussa,constitutes a major constraint of good economic management,agronomical and environmental. thanks to the bio-augmentation phenomenon,this study was conducted to estimate interactions effects between herbicides glyphosate and 2.4-d (end-use formulation) and microorganism inoculum on assimilable phosphorus production,as well as on evolution of nitrate nitrogen in both agricultural soils (s1 of beni ammar and s2 of maiz bachir). experiment focused on both herbicides which have been added to agronomical rate after conversion. during this work,we used as inoculum pseudomonas aeruginosa (109 bacteria/l),a microbial strain which we have isolated from an adapted soil to herbicides degradation. after three months of incubation,the results obtained confirm significant variable effect of herbicides glyphosate and 2.4 d. the survey showed that there is a toxic effect in non-inoculated treatments compared to the witnesses. also,this investigation revealed that inoculation of pseudomonas aeruginosa in both treated soils by herbicides allows an improvement and increase of p2o5 and no3 - quantities. in effect,stimulation rates recorded allow confirming that positive effect of this bacterial intervention process. © 2017,university of mohammed premier,oujda morocco.