Effects of irrigation system on the water consumption and the yield of winter wheat

The field experiments were carried out at Wuqiao Experiment Station of China Agricultural University from 1993 to 1994.Eleven irrigation systems were made up by five irrigated rates at winter wheat growth period from non-irrigation (0 mm) to four-time irrigation(4×75 mm),and by five irrigated times from upstanding stage to grain-filling stage,their water consumpation and yield formation were studied.The results showed that the total water consumpation increased,and soil storage water consumption decreased in proportion to the increment of irrigated water;and the proportion consumed after flowering stage increased as the total water consumption increased.The yield and their components changed significantly under different irrigation systems. It showed that irrigation at upstanding stage increased ear number,at jointing stage increased grain number,and at booting stage or flowering stage increased grain weight.Irrigation once at booting stage was the best.Two-times of irrigation should be given at jointing stage and flowering stage,and three times of irrigation should be given at jointing stage,flowering stage and grain-filling stage.It was very useful for higher yield and water use efficiency by limiting the water consumption before flowering stage and increasing the consumption after flowering stage.