Influences of regulated deficit irrigation（RDI）on agronomic  traits and dry matter accumulation of maize

Taking Zhongdan808 as material， by pot experiment， this paper studied the effects of different regulated deficit irrigation（RDI） leaf age， RDI degree， RDI time on agronomic traits and dry matter accumulation of maize Results showed that at different leaf age with RDI， plant height， stem diameter and leaf area per plant in four leaf age and five leaf age were bigger than those in three leaf age after 10 days re-watering， these traits in three leaf age and four leaf age were significantly higher than those in five leaf age at huge bell stage and spinning tasseling stage. Plant height， stem diameter， leaf area per plant by RDI at 55%-65% were significantly higher than those by RDI at 40%-50%. Lasting 12 days of RDI developed the growth of maize plant height， stem diameter and leaf area. Dry matter weight of each part and whole plant both were the largest in the combination of 4 leaf stage， RDI at 55%-65% and RDI for 12 days processing. Therefore， Zhongdan808 grew well in the combination of 4 leaf stage， RDI at 55%-65% and RDI for 12 days processing.