Article ID Journal Published Year Pages File Type
9488702 Scientia Horticulturae 2005 9 Pages PDF
Abstract
The effects of the concentration of and exposure time to chloramine, the product of the reaction between hypochlorous acid and NH4+, on root browning and growth of lettuce (Lactuca sativa L.) cultured hydroponically were investigated. Addition of hypochlorous acid in the form of sodium hypochlorite at 0.3 mg Cl/l to the nutrient solution containing 0.67 mM NH4+ significantly inhibited plant growth 10 days after the start of treatment. Exposure to chloramine for even 1 h by the addition of hypochlorous acid at 0.5 mg Cl/l to the nutrient solution containing 0.67 mM NH4+ also significantly inhibited plant growth. Furthermore, in the nutrient solution containing NH4+ at more than x1/256 unit of Enshi standard, 5.2 × 10−3 mM, plant growth was significantly inhibited following the addition of 0.5 mg Cl/l hypochlorous acid. It was estimated that the critical chloramine amount at which lettuce plant growth was significantly inhibited was 0.18 mg Cl/g root FW.
Related Topics
Life Sciences Agricultural and Biological Sciences Horticulture
Authors
, , , ,