Abstract: To inquire the characteristics of leaf senescence of different cultivation years maize of alfalfa-maize rotation.The Jinshan 27 was grown under 4-year high-yielding cultivation maize in preceding of 7-growth-year alfalfa.After silking,content of chlorophyll,MDA content,SOD and POD activity were measured every 10 days.The yield of maize of alfalfa-maize rotation was decreased with tillage years prolonged,compared with the first year,the yield of second,third and fourth felled 9.7%,13.6%and 19.1%,respectively.Leaf senescence rate of maize of different cultivation years were increased with tillage years prolonged,and the difference was decreased with tillage years prolonged.The content of chlorophyll of leaf of maize of different cultivation years was significant different at different stage and different leaf position from 20 days to 40 days after the silking,and were decreased with tillage years prolonged,and three-ear leaves was more obvious.The SOD and POD activity of leaf maize of different cultivation years were decreased with tillage years prolonged,and the difference of SOD and POD activity of leaf were increased with the growing process.The MDA content of maize of different cultivation years was increased with tillage years prolonged,and different of maize of different cultivation years were increased with the growing process,and three-ear leaves were more obvious.The yield of maize of alfalfa-maize rotation was decreased with tillage years prolonged,the SOD and POD activity of leaf were decreased,and the MDA content was increased at late-growth,and three-ear leaves were more obvious.

Key words: Alfalfa-maize rotation, Cultivation years, Late-growth, Leaf senescence

CLC Number: 

• S513