Pomace is the solid residue by-product resulting from the extraction of olive oil. Their high content of organic compounds gives them the possibility of being used also as green manure. We have tried this amendment approach on two varieties of cherry grown in the Tlemcen region. The Sunburst and the Black Bigarreau. Its use in combination with N.P.K fertilizers increases the carbon content of the soil, boosts the formation of May bouquets, and improves the water-holding capacity of the clay-humic complex. The results of this study showed that olive pomace used as a fertilizer, alone or in combination with N.P.K mineral fertilizers creates an advantage on the phenological and biochemical aspect, especially on the Black Bigarreau variety.

The monitoring of the phenology of the two varieties of the cherry tree, the Black Bigarreau and the Sunburst, revealed that the climate of the region plays a very important role in the progress of the harvests, where the Black Bigarreau showed an earliness of 9 days between the year of 2018 and 2019. The Sunburst variety showed an earliness of only 6 days compared to the same years. This is explained by a time lag of flowering due to the fact that the climate-related interference linked to the thermal amplitudes of 2018 is greater than the one of 2019. Our study on the phenological stages of the two varieties of cherry allowed us to determine the duration of full blooms, important for pollination. Also, the climatic factor represented by the temperature influences the breaking of dormancy. It also has an effect on the setting of fruit as well as the precocity of ripening.