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This study is a floristic investigation of the steppe region of Djelfa located in northern Algeria, with the aim of characterizing and analysing the wild flora of this region. Four stations were chosen according to a stratified sampling method and phyto-ecological surveys were carried out in 32 plots of 100m2 each. This allowed us to identify 127 taxa of plants belonging to 33 families dominated by Asteraceae (29%) and Poaceae (12%). The analysis of biological types has shown the dominance of annual Therophytes (56%) in this flora, which indicates the presence of the phenomenon of Therophytization in these regions. This phenomenon was also measured by calculating the perturbation index. The analysis of chorological types has shown the dominance of the Mediterranean element (48%), with an interesting number of endemic taxa. However, all the endemic taxa cited in the literature for this region have not been found, which reinforces our fears about the state of conservation of these taxa of biological and heritage value.

The Co-Compostage (CC) of Palm (Poenix dactylifera L.) Fiber (PF) and Sewage Sludge (SS) at volume rate (1PF/1SS), mixed with Top Soil (TS) have been used as a substrate for cucumber cultivated in soilless crop system. Five substrates with volume ratio T (CC-TS) were tested: T (10-0), T (9-1), T (8-2), T (7-3) and T (6-4). They were compared to peat in nursery and to TS in Cucumis sativus L. crop production. Total porosity, bulk density, moisture content, rate of drainage, pH and electritical conductivity of T (8-2) and T (7-3) were relatively favorable for plant growth. After 45 days of growth and in comparison to peat, T (9-1), T (8-2) and T (7-3) gave the best parameters of root development: volume, architecture, length, number, best seedling growth and a positive correlation (R = 0.751) between root and shoot dry matter. After 120 days, cucumber attained the best root development under T (8-2) and T (7-3). Fruits production of these substrates was 40% higher than those of the control.

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