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    STUDIA BIOLOGIA - Issue no. 1 / 2005  
         
  Article:   INFLUENŢA MICROELEMENTELOR CUPRU ŞI ZINC ASUPRA DINAMICII FOSFORULUI ╬N FRUNZELE DE CĂPŞUN (FRAGARIA ANANASSA D.).

Authors:  LAURA GROZA, CRISTINA DOBROT─é.
 
       
         
  Abstract:  The Influence of Copper and Zinc on the Dynamic of Phosphorus in Strawberry (Fragaria ananassa D.) Leaves. Despite the wide range of copper and zinc concentrations in agricultural soils, and the potentially-toxic effects on plants of high concentrations of these elements, relatively few studies have examined their impact on other mineral nutrients. In this study, we examined the effects of copper and zinc supply on the dynamic of phosphorus in plant leaves. Strawberry plants (Redgauntlet cultivar) were grown in a 1:1:1 (v/v/v) soil:sand:silt mixture watered to saturation every other day and fertilized with a mineral solution containing N 15%, P 15%, and K 15%. Foliar applications of copper and zinc concentrations ranging from no added to concentration 5Ľ10-2% (expected to be toxic) were tested. In all treatments, copper supply significantly enhance the phosphorus concentration in plant leaves, but not the zinc supply. However, phosphorus concentration progressively decreased over time in all Cu or Zn treatments, remaining anyway higher than the control. These results suggest a progressing phosphorus deficiency in plants that received little or no supplemental copper. These results are consistent with results from studies on a range of agricultural plants, which suggest that Cu is required in low concentrations by plants for normal functioning and becomes toxic at higher concentrations.  
         
     
         
         
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