STUDY THE EFFECT OF SOME NITROGEN SOURCE AND TWO ELEMENTS CADMIUM AND LEAD ON SOME MORPHOLOGICAL AND PRODUCTIVITY FEATURES OF WHEAT TriticumaestivumVar.Ipa 99

Abstract

The research carried out as a laboratory experiment in the laboratories of Biology Department / College of Science / University of Anbar during the winter season 2010 – 2011 by using pots contained 9Kg of sand washed with distilled water for several times to ensure it is free of all nutrient elements and the heavy metal. The aim of this experiment is to study the impact of environmental pollution by two elements (cadmium , lead) and it's interaction with four sources of nitrogen nutrients on some morphological and productivity features of wheat ( Triticumaestivum Var. Ipa 99) and to study the impact of these nitrogenous sources on accumulation of those heavy metals in different plant parts (Roots , Shoots , Grains) The experiment was designed as Completely Randomized Block Design , factorial experiment with three replications , included a study of three factors :The first factor, Type of the heavy metal (cadmium , lead) The second factor, Concentration of heavy metals, The third factor , Type of the nitrogenous source [ Nitrate Ca(NO3)2 , Ammonium (NH4)2SO4 , Ammonium nitrate NH4NO3 , Urea CO(NH2)2]. The plants The plants had been irrigated with Hougland complete nutrient solution for the four nitrogenous sources without adding the heavy metals and 14 days later different concentration of cadmium and lead were added to the nutrient solutions above . During plant growth were calculated leaf area , before the harvest , plant height measures had been taken , after harvest calculated the dry weight for the roots and weight of 100 grain of plant yield. Statically analysis was performed to find out the differences at probability level( P≤ 0.05) between the different nitrogenous sources and type , concentration of the heavy metals . The result showed : ammonium source have the higher value of leaf area , plant height , nitrate source have the higher value of dry weight of 100 grain , ammonium nitrate source have the higher value of dry weight of root . the heavy metals negatively effected on all studied features , cadmium more effected on plant height , root dry weight , 100 grain weight , while lead more effected on leaf area