Hydraulic Characteristics Of Water Injection And The Effect Of Injection Irrigation On Jujube’s Physiological Characteristic

Aiming at High water consumption of jujube surface irrigation and situation of water savingdrip irrigation advantage is not obvious in Arid region， Put forward Pressurized waterinjection irrigation of the root， It Is a new irrigation that injection water and fertilizer tojujube root directly. It is more than drip irrigation of saving water thirty percent. In this paper,through the use of CFD numerical simulation calculation and field experiment method. To explorethe hydraulic characteristics of the water injection pipe and root zone soil moisture diffusion,jujube root growth characteristics, the soil characteristics, physiological characteristics ofinfluence of jujube. Reveals the mechanism of pressurized water injection irrigation in jujube rootzone, To provide the scientific basis for improving the utilization rate of the upgrade andoptimization of pressurized water injection irrigation equipment and water resources in arid areaand in the orchard irrigation application. The main results are as follows:1. CFD value simulation can change characteristics of pipeline internal reflect better the flowpattern and velocity at orifice and pressure values; when the water injection pipe inlet velocity is0.82m/s, the inlet pressure is6m, the hydraulic performance is excellent, can obtain the effect ofwater injection well in the root zone; one of the optimum parameters of orifice spacing for120mmcan be used as root the pressor area of emitter.2. Pressurized water injection irrigation process, the influencing factors of the form ofdistribution and cause of wetted soil erosion is the main space of water injection pressure,followed by the injection volume, is basically not affected by water injection depth; and when thewater pressure is6m, water injection amount is50L/strain, moist body distribution is mostconducive to the main root of jujube water absorption of moisture absorption and utilization. Andin the water injection pipe orifice below about10cm for scouring effect is most obvious, in orderto avoid the damaging effects of root and soil water erosion, should be combined with the croproot distribution of selecting suitable embedded position and depth in the pre buried waterinjection time.3. The jujube photosynthetic physiological indexes calculated water use efficiency showed thatthe injection pressure maximum influence on the treatment effect of water use efficiency, waterinjection rate and injection water pipeline buried depth effect of. And the5m injection pressureconditions, can obtain the optimal water use efficiency of Chinese jujube.4. Pressurized water injection irrigation condition, the quality of jujube root density, root lengthdensity in the vertical direction appears first increased and then reduced phenomenon, thedirection of space respectively has a good two times, three times function relationship.