Status and distribution of certain nutritional elements in soil and dynamics of their absorption by plant

Abstract

Wafaa Mohamed Talia Elctr. Status and distribution of certain nutritional elements in soil and dynamics of tlicir absorption by plant* Doctor of Philosophy (Soil Sci.), Ain Shams University, 1995. Bolh field studies and pot experiments have been performed to evaluate the nutritional status and distribution of elements in soil, dynamics of such elements being also evaluated. Field studies were carried out at Salhia region of Esmailia govemorate using the three crops of wheat, successive growth stages, as well as grapes and mandarin. Physical and chemical characterists of studied area were evaluated under different environomental conditions. Nutrient status in soil and dynamics of the concerned nutritional elements were also detected both through the various profile layers and different selected locations. Finally, nutrient equilibrium among different forms of the studied macronutrients in soil was traced to study transformations of such elements from form to other. Nutrient status in plants was studied in different plant parts to be then correlated with available form in soil for both macronutrients and micronutrients; evaluation for shoot : root ratios of wheat plants were also performed at different studied growth singes. Pot experiments, on the other hand, were designed for evaluation of certain phases of uptake dynamics, with com being the chosen indicator plant.. Nitrogenous and phosphatic fertilizers were applied at 3 levels; status for both nitrogen and phosphorus in plants was determined, correspondent shoot / root ratios, for all studied parameters of dry matter and concerned elements, being also detected. i Efficiency of absorption decreased as the rate of applied fertilizer increased, utilization quotient being not greatly changed for both studied nutrients during the conccrncd growth period of the studied plants which seemed to be, along with fertilization design, affecting the dynamics of nutrient absorption.