EFFECT OF APPLICATION OF FLY ASH, DERIVED FROM LIGNITE FIRED PLANTS, ON SOME PHYSICOCHEMICAL CHARACTERISTICS OF THREE SOILS AND ON NUTRIENT UPTAKE BY PLANTS.
Abstract
FLY ASH, A BY - PRODUCT OF COAL FIRED PLANTS, IS PRODUCED IN LARGE QUANTITIES AND ITS DISPOSAL CONSTITUES A SERIOUS PROBLEM. THE USE OF FLY ASH AS A SOIL AMENDMENT MIGHT BE A SOLUTION TO ITS DISPOSAL PROVIDED THAT IT DOES NOT IMPART ADVERSE EFFECTS ON SOILS AND THE ENVIRONMENT. IN THIS STUDY, ALKALINE FLY ASH WAS APPLIED TO THREE SOILS (TWO ACID AND ONE CALCAREOUS) WITH THE OBJECTIVE TOINVESTIGATE THE EFFECTS ON: A) SOIL PH, SALINITY AND BORON LEVELS, B) YIELD AND UPTAKE OF BORON AND PHOSPHOROUS BY RYE - GRASS (LOLIUM PERENNE L.), C) THE ADSORPTION - DESORPTION BEHAVIOUR OF BORON. FLY ASH APPLICATION, AT RATES 0.52 AND 5% INCREASED THE PH (UP TO ABOUT 8.0) AND THE ELECTRICAL CONDUCTIVITY OF THE SATURATION EXTRACT (UP TO ABOUT 2.5 DS/M) OF ALL THREE SOILS, BUT MAINTAINED AVAILABLE B AT ACCEPTABLE LEVELS. YIELD OF RYE - GRASS AND UPTAKE OF BAND P WERE SIGNIFICANTLY INCREASED UPON FLY ASH APPLICATION, ONLY IN THE TWO ACID SOILS. THE NONLINEAR LANGMUIR ISOTHERMS WERE EQUALLY S ...
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