Effect of different NaCl concentrations on plant growth and nitrogen uptake of summer corn

For investigating the salinity(NaCl)effect on summer corn and N uptake, an experiment with perlite as culture medium was conducted in greenhouse. Five NaCl concentrations 10, 20, 40 and 60 mmol/L added to irrigation water, respectively and the other one was controlled. Results indicated that leaf area, plant height, dry matter accumulation, root length, and total nitrogen uptake by plant decreased significantly with the increasing of concentration of NaCl in culture solution to 60 mmol/L from 25 days to 101 days after emergence, but salinity was no affect on nitrogen content in root and shoot. The accumulation of nitrogen in plant increased with time, and the relationship was a quadratic function.