Effect of Applying Fertilizer on Root Activity, Delaying the Senescence of the Flag Leaf and Yield in Winter Wheat

Soil fertility and levels of applying fertilizer significantly regulated the mass root activity of wheat. With the increase of soil fertility, the mass root activity of wheat became stronger and stronger. Applying fertilizer could obviously improve the mass root activity, prolong the senescence of the flag leaf (by increasing the chlorophyll content, improving the rate of photosynthesis, enhancing the activity of SOD and POD, and loweringthe content of MDA), and improve the grain yield significantly than that of CK. The combination of organic manure and non organic fertilizer was the better applying method among the levels.