Effects of Different Quantity Water-retaining Agent on Ecophysiological Characteristics of Maize in Seedling Stage

The field experiment on morphological and physiological characteristics of seedling stage of maize was conducted under different quantity of water-retaining agent to find out the optimal dosage.The results showed that topsoil moisture content was boosted remarkably by a specified quantity of water-retaining agent.With increasing quantity of water-retaining agent,maize's plant height,stem diameter,and leaf number per plant raised at first and became lower later.They reached the peak at the dosage of 60kg/ha.The change of leaf chlorophyll content,soluble sugars content and soluble protein content raised at first,then became lower and raisedagain at last.They peaked at the quantity of 60kg/ha and 120kg/ha,while the leaf proline content and peroxidase activity showed the opposite changing pattern.They reached a minimum at the quantity of 60kg/ha.