The study is carried out on soil samples taken from the Technical Institute of Field Crops (ITGC) of Guelma, in order to know the effect of applying different doses of the herbicide bromoxynil phenol (80g / l, 60g / l and 40g / l) on some physico-chemical parameters of the soil cultivated by durum wheat Triticum durum Desf. The results obtained show that the soil properties in the two main stages of wheat development (tillering and heading). In the tillering stage, the soil has a clayey or sandy-clay texture, is neutral, has a very low salinity, low porosity and inconsiderable amount of phosphorus. But at the heading stage in which we used the same analyzes for the same parameters, we obtained a soil acidity with an increase in the conductivity and porosity and a remarkable decrease in the amount of phosphorus. \nIn a general way, the results of analyzes of the studied characteristics indicate that there is a negative effect of bromoxynil phenol on the physicochemical properties of the soil and its excessive use can decrease the fertility (cause sterility) of the soil.\n\nKey words: Soil, bromoxynil phenol, tillering, heading, Triticum durum Desf.

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