Effects of Cold Plasma and Ozone Water Treatment on Micronutrient Solubility

Cold plasma and ozone sanitation of irrigation solutions can oxidize both microbes non-target micronutrients because their high oxidation-reduction potential (ORP) is a non-selective mode action. The objective this study was to evaluate the effects cold treatment on oxidation iron manganese in nutrient containing one four chelates (iron-ethylenediaminetetraacetic acid (Fe-EDTA), iron-diethylenetriaminepentaacetic (Fe-DTPA), iron-ethylenediamine-N,N′-bis(2-hydroxyphenylacetic acid) (Fe-EDDHA), hydroxybenzyl ethylenediamine (Fe-HBED)). Nutrient were recirculated through or system until ORP reached 700 mV. concentrations total dissolved iron, manganese, chelated measured before after passing systems. Both oxidized decreased solubility manganese. had similar micronutrients, pH, electrical conductivity, oxygen at standardized target Fe-EDTA most resistant chelate oxidation. With Fe-EDTA, increased more quickly, concentration Fe less with increasing over time compared Fe-DTPA, Fe-EDDHA, Fe-HBED. by up 80% for EDDHA mV 20% decrease EDTA. Mn 85% design water therefore requires consideration secondary micronutrients. dosage, flow rate, solution particular grower operation are likely affect quantity micronutrient fertilizer that needs be supplemented following treatment. Use strategy reduce loss increase residual available sanitation.