The spring wheat (Triticum aestivum longchun 27) selected as test material

a field experiment

which involved in three treatments were

1)Whole field soil plastic mulching and irrigation (FMSI)

2)Whole field soil plastic mulching (FMS)

and 3)Uncovered and bunch seeded (CK)

had been conducted from 2012 to 2014 at Gansu Dingxi on northwest Loess Plateau (104°36′ E

35°35′ N). The seasonal soil water content

biomass

yield and its components of spring wheat had been recorded

and the periodical water consumption

water consumption modulus coefficient

water consumption intensity

water use efficiency had been calculated

to reveal the water consumption characteristics of the whole field soil plastic mulching and bunch seeded spring wheat

and its effect on yield formation and water utilization. The average water consumption from sowing to jointing

jointing to heading

to Filling

and Filling to Maturity of FMSI in 2013 and 2014 were 159.5

115.0 mm

47.7 mm and 117.7 mm

the water consumption modulus coefficient were 39.7%，21.5%，13.8% and 25.0%

respectively

and there were no significant difference between 2013 and 2014. It’s indicated that the results could be served as the spring wheat water requirement pattern under whole field soil plastic mulching condition. The soil water storage in 0—300 cm soil profile of FMS was higher than CK in sowing

jointing and filling of spring wheat. From sowing to jointing

the water consumption intensity of FMS increased by 20.0%

5.8%

but from filling to maturity

it decreased by 26.4%

14.1% in 2013 and 2014 respectively

as compared with CK. The biomass of FMS was significantly higher than CK from 2012 to 2014. Especially

it increased by 95.7%

42.8% and 108.7% than CK in maturity. The plant height

spike length

plant weight

spike weight

spike lets numbers

spike grain number

1000-grain weight of FMS were significantly higher than CK

resulted in the increment of grain yield for 35.4%

58.9 % and 61.9%

and increment of water use efficiency for 44.6%

54.6% and 69.0% while without significantly increment of evapotranspiration from 2012 to 2014. Consequently

the FMS regulated the water consumption process in different precipitation year

improved the water consumption modulus coefficient and water consumption intensity in productive growth stage of spring wheat

this benefited to source development and resulted in increasing yield and WUE while decreasing evapotranspiration in filling .