Abstract:

To determine feasible irrigation stage and amount of super-high-yield land (9750 kg/hm2) and excavate the yield potential of super-high-yield wheat, we created conditions in super-high-yield land of Jinhai seed limited company to evaluate the effects of irrigation stage and amount on the flag leaf senescence and yield of super-high-yield wheat after anthesis. The results indicated that, irrigation had significantly effect on senescence indexes of the flag leaf, and irrigation could greatly delay the senescence of the flag leaf by improving the structural integrity and function continuity of the flag leaf. Compared to the control irrigation increased the chlorophyll content (SPAD value), LAI, POD, SOD, CAT activity, decreased the final product of lipid peroxidation (MDA), and significantly increased the grain yield of super-high-yield wheat while the water use efficiency was high. In the conditions of this experimental, the treatment T5 was irrigated 60 mm at wintering, jointing and filling stage respectively, of which the flag leaf senescence was obviously delayed, and its yield which was different from others significantly reached super-high-yield level (9923.58 kg/hm2), so T5 was the feasible irrigation scheme to super-high-yield land. Continuing to increase irrigation amount (T7 and T8) the chlorophyll content(SPAD value) and LAI dropped, POD, SOD, CAT activity had little rate of increased amplitude, and grains per spike, 1000-grain weight and water use efficiency were decreased significantly.