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absorption accumulation activity Agricultural amino acids ammonia ammonium amount apple application bark barley calcium cells chelating concentration crop cultivars decreased determined dry weight DTPA effect experiment experimental extracted fertiliser fraction franklinite genotypes grain yield grown growth rate gypsum harvest higher hydroxyproline increased iron irrigation Journal kg/ha leaf leaves levels lime maize MATERIALS AND METHODS metabolism micronutrient mineral nitrate reductase nitrification nitrogen nutrient nutrient solution organic matter pasture phosphate phosphorus photosynthesis Plant Analysis plant growth Plant Nutrition Plant Physiology plot potassium pots proline protein reduced Research response rhizospheric rice root salinity salt tolerance samples seedlings senescence shoot significantly sludge soil pH Soil Science soil solution soluble solution culture soybean spinach sprays supply t/ha Table temperature tissue toxicity treatment uptake urea values water stress wheat plants winter wheat zinc deficient Zn deficiency