Abstract: By the method of solution culture,this paper studied the P and Zn uptake of maize at its growth stages under different P supply levels.The results showed that maize growth reached its maximum at the supply level of 100 μmol P·L^-1,while the root/shoot ratio was the highest at 0.1 μmol·L^-1 P supply.Increase of P concentration in culture solution promoted the uptake of P,but decreased its utilization rate.The Zn content in root increased with increasing P supply,while that in shoot varied little,which meant that the Zn transportation rate from root to shoot had little change with increasing P concentration.There was a positive correlation between the concentrations of Zn and P in maize seedling roots.

Key words: Eco-agricultural model, Management information, Decision support system, Chinese eco-agriculture