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In a completely randomized design, the effect of the extract from Trifolium alexandrium (0, 0.2 and 0.4%) on the germination, some morphological characteristics, photosynthetic pigments, and nutrients uptake of Prosopis cineraria was evaluated. The highest germination rate and percentage (9.16 and 21%, respectively) were recorded in the 0.2% treatment. The maximum and minimum lengths of radicle (6.58 and 3.16 cm) and pedicel (6.56 and 14.23 cm), and dry weight were recorded in the control and 0.4% treatments, respectively. The highest level of chlorophyll a (16.80 mg g^-1 fresh weight) was found in the control. The highest and lowest chlorophyll b (9.65 and 7.96 mg g^-1 fresh weight) were measured in the 0.2%and control, respectively. The extract adversely affected the nutrient uptake by P. cineraria, the minimum and maximum of which were recorded at the 0.4%and control treatments, respectively. In general, although the extract of T. alexandrium increased the P. cineraria germination in the 0.2% treatment, the increased concentrations led to its reduced growth and nutrient uptake. Therefore, the simultaneous cultivation of these two species in the dry lands is not recommended.

Keywords: Allelopathy, Plant growth, Plant Extract, Photosynthetic pigments

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* Corresponding Author Address: Zabol

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