Abstract: Based on research throughout the recent 20 years on cultivating techniques and physiological basis in winterwheat with objective of water saving and high yielding,trend in relationship between water supply amount and grainyield of winter wheat from 1987 to 2007 was characterized by analyzing experimental data of four typical years of 1987 ,1989,1996 and 2007 .The results showed that the relations of water supply amount versus grain yield could be well fittedby parabolic curves .Current wheat crop required much less amount of water for achieving its growing maximum yield thanthat of 1980′s .The water amount required for achieving its maximum yield decreased from 475 mm in 1987 to 280 mm in2007 ,with a mean yearly drop of 10 mm .Meanwhile,the maximum yield level grew from 5 358 .5 kg/ha to 9 240 .9kg/ha ,with an average yearly increase of 194 .1 kg/ha .High level of soil moisture during grain filling stagewas beneficialto wheat production of 1980's ,which,however,led to reduced grain weight and grain yield for present wheat crop .Thesechanges mainly attributed to utilization of integrated water -saving management techniques,improvement in water -savingand high yielding traits of new cultivars and enhancement in soil fertility .

Key words: Winterwheat, Watersupplyamount, Yield

CLC Number: 

• Q946.5