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چکیده
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Information on uptake of minerals by weeds and crops is necessary in order to evaluate the outcome of competition under diff erent scenarios such as salinity stress. Crops usually are less tolerant to salinity than many weeds and, therefore, crops are likely to be subjected to more weed pressure under saline than non-saline condition e.g. due to nutrient imbalance. A pot experiment was conducted to study the uptake of Fe, Cu, Na and K by Sinapis arvensis and Rumex crispus in competition with lentil (Lens culinaris medik) and kidney bean (Phasaeolus vulgaris L.). The treatments were ammonium phosphate (P) (0 and 50 mg/kg soil), salinity (0 and 3000 mg/L), weed species (2) and crop species (2) with three replicates. The results showed that P resulted in an increase in the uptake of Na and K and a decreased uptake of Fe by both weed species. It also resulted in increased dry weight in both weeds. The uptake of Na by lentil was higher than that of kidney bean and was higher in both crop species under the salinity treatment. It is concluded that weeds, but not the crops, were able to uptake more Na and K when ammonium phosphate is applied. Since the weeds were not aff ected by salinity, salinity may increase the adverse competitive eff ects of weeds on the crop.
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