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This study compared phenolic contents and antioxidant activity in different organs of Acacia albida (leaves and bark) and focuses on identification of phenolic compounds of leaves by HPLC-DAD. The analysed organs exhibited differences in total polyphenol contents (100 and 59.5 mg GAE g(-1) DW). Phenolic contents of leaves were two times higher than those in bark. Ethanolic extracts exhibited good antioxidant activities with IC50 = 26 μg mL(-1) for DPPH and EC50 = 50 μg mL(-1) for FRAP. Identification by HPLC-DAD revealed the presence of nine phenolic compounds known for their high antioxidant activity. The results suggested that this species can be used as source of natural antioxidants.

The study was conducted in the semi arid area of Northeast of Algeria to characterize the physiological and biochemical effects of phosphate fertilisers on two precocious varieties of wheat (Triticum durum Desf.). The experiments were conducted on the experimental plots with the addition of different levels of the commercial fertiliser TSP at 15, 20 and or natural phosphate rock at 35, 50 and containing 46% and 20% of respectively, whereas potassium and nitrogen were applied at constant split rates to all plots at for the first and for the second rate. The crop was irrigated weekly during the wet period and 2 times during the dry period. Ten samples from each treatment were analyzed for leaf chlorophyll concentration, dry weight accumulation (shoots and roots), grain yield, and phosphor accumulation. The results showed that addition of phosphate fertiliser were equally effective with regard to all parameters irrespective of the form (TSP and ). Therefore, we conclude that the commercial water soluble TSP can be substituted by the sparingly soluble natural phosphate fertiliser without significant negative effects on growth and yield of the two wheat varieties. , whereas varietal difference was observed towards these two fertilisers.

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