The Study Of Gravel Soil Under The Condition Of Drip Irrigation Inifltration Model And The Root System Distribution Of Red Jujube

Through the gravel soil in the gobi drip irrigation tests, researched the different affect ofthe irrigation time and drops to head flow moist soil body features, In order to povide a theorybasis of the drip irrigation systems for the scientific design and moisture precise managementsystem.In this paper,take the gravel soil gobi as study area, designed for4h, irrigation time6h,8h and drops4.0L/head flow h,6.0L/h,8.0L/h double factors test, moist soil body levelobservation diffusion distance and vertical diffusion depth. For this type of soil under thecondition of drip irrigation field planting3years in5years and seven years of red jujube rootsystem distribution modified ditch method carries on the observation, understanding thejujube tree root distribution and growth situation. the main contents in this paper as follows:（1）the gravel soil moist approximate body rotation gobi drip into objects, as irrigationtime and drops the increase of head flow, moist soil body level diffusion distance and verticaldiffusion depth are increasing; And drip irrigation wettability model nonlinear regressionformula that experience for D=（17.353+0.788q）Q0.512（R=0.954，P<0.001）å'ŒH=（56.887+1.541q）Q0.271（R=0.966，P<0.001）, the above relations, has the very highcorrelation; According to the empirical formula that drops for head flow5L/h advisable,irrigation time to6~8h advisable, should not be more than8h, drop head spacing around100cm.（2）the gravel soil conditions red jujube gobi drip irrigation incline to the fertilizerwater. A large vertical root system is mainly distributed in the20cm to80cm profile,especially20cm~60cm profile, and the total GenLiang65-80%, horizontal direction ismainly distributed in the0~50cm soil layer, the root system to the total number of rootsystem mostly number more than90%, where0~40cm soil total root root mostly numbermore than79%.The papaer researched a tentative explore in the gravel soil gravel soil under thecondition of gobi drip irrigation of3~7born in the year of vertical root red jujube mainlydistributed in less than60cm, horizontal direction is mainly distributed in the0~50cm soillayer, the basal fertilizers depth should in30～50cm, fertilization slot can be dug between inthe rows of trees.