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The Eco-physiological assessments of variable parameters known to be essential for proper plant growth and health were determined in cucumber plants exposed to short term treatments in 42 days using two broad classification types; Photo Fenton solution generating OH radicals and simulated acids. Solutions containing different classification of scavengers of OH radicals and mannitol were employed as Controls. Results indicated that the acid rain and photo Fenton solution both decreased the photosynthetic rate (Amax), stomatal conductance (gs), photochemical efficiency of PSII in the dark (Fv/Fm), SPAD chlorophyll and they imparted severe foliar injuries on cucumber leaves. The acids treatments have the highest negative impact followed by the photo Fenton Solution. The mechanisms of phytotoxicity of the two solutions may be through OH radical and other Reactive Oxygen Species (ROS) generation. The addition of mannitol, catechin hydrate and tea solutions to the acids and photo Fenton solution mixtures all mitigated the negative effects of the duo on the cucumber plants. Mannitol at dosage applied in the present study can be adjudged to be the best in the amelioration of the negative effects of the fumigants. Future plant protection from deleterious impacts of atmospheric and hydrospheric pollutants can employ mannitol as scavengers of ROS.

Comparative Effects and Phytotoxicity of Photo Fenton Solutions and Acid Rains on Cucumber (Cucumis Sativus) Plants: Treats and Console