Abstract

The effects of the concentration of and exposure time to chloramine, the product of the reaction between hypochlorous acid and N H 4 + , 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 N H 4 + 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 N H 4 + also significantly inhibited plant growth. Furthermore, in the nutrient solution containing N H 4 + 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.

Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call