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absorption accumulation acid aerated aeroponics ammonium anions Boric acid Boron Calcium nitrate Calcium sulfate cations chelate chemical source chloride container Copper crop cucumber deficiency symptoms determine disease effect elemental concentration essential elements excess Fe deficiency fertilizer filtering fruit gravel grower growing plants growth medium Hoagland hydroponic systems ions iron Fe KNO3 leaf magnesium Mg Magnesium sulfate maintain major elements micronutrient Molybdenum monitoring NFT systems NH4+ nitrogen normal nutrient solution composition nutrient solution flow nutrient solution formulas nutrient solution management organic soilless mix perlite pest phosphate Phosphorus pine bark pipe plant analysis plant growth plant nutrition plant roots plant species plant tissue Potassium nitrate Potassium sulfate problem procedure range ratio recirculating recommended root growth rooting media salts sample sand soil soilless culture systems soilless growing systems soilless media soluble specific sufficient sulfate temperature tomato toxicity trough uptake vermiculite volume water and elemental wilt on high