Effect of Subsoiling Tillage and Ploughing Tillage on the Root Senescence after Anthesis and Yield of Wheat in Dry-land

The effect of subsoiling tillage and ploughing tillage on the root senescence after anthesis and yield of wheat was studied with Jimai 22 as the test material during 2009-2010 in dry-land condition.The results showed that the activity of superoxide dismutase(SOD) enzyme and nitrate reductase(NR) of wheat roots in the subsoiling tillage treatment were higher than that of in the ploughing tillage treatment.And the content of malondiadehyde(MDA) in the subsoiling tillage treatment was lower than that of in the ploughing tillage treatment.And the content of soluble protein decreased slowly after anthesis in the subsoiling tillage treatment.This indicated that the subsoiling tillage could delay the senescence of wheat root system.The spike number,grain number per spike and thousand grain weights of wheat in the subsoiling tillage treatment were higher than that of in the ploughing tillage treatment,and there was significant difference in the grain number per spike between them,so the subsoiling tillage was benefit to gain higher yield.