Effect of Different Irrigation Quantity on Fruit Growth and Yield of Jujube

In order to explore effects of different irrigation amounts on fruit setting，fruit growth and yield of red jujubes，the 7-year-old jujube in Minqin was used as test material，and three different irrigation volumes（2 700，3 375，4 050 m3/hm2）were set under condition of sand pipe irrigation and a surface drip irrigation（4 050 m3/hm2）control field experiment.Results showed that fruit setting rate and yield of 4 050 m3/hm2 reached the maximum，which were 6.73% and 12 589.2 kg/hm2，respectively，which were significantly higher than other treatments.There were two obvious swelling peaks in longitudinal and transverse diameters of fruit，and in the first swelling peak，expansion rate of jujube fruit was much higher than the second one.Fruit setting rate，fruit expansion rate and yield all increased with increase of irrigation water.Under the same irrigation volume，indicators of sand tube irrigation were higher than surface drip irrigation.Combined with local environmental conditions，the irrigation volume of 4 050 m3/hm2 was suitable for growth of local jujube.