The Irrigation Effect And Technology Of Bubble-root Irrigation On The Jujube Tree

In order to popularize bubble-root irrigation,this paper aimed to study the effects ofbubble-root irrigation. Three experiments are conducted, that were the influence ofbubble-root irrigation on evaporation from soil and physical properties of soil, the effect onthe growth of slop-land jujube in Northern Shanxi Province and effects of differentarrangement of the emitter on potted jujube. Three irrigation methods of surge spring rootirrigation, drop irrigation, pipe irrigation were set in the first two experiments. to The effect ofbubble-root irrigation and the principles of water conservation were revealed by the way ofcomparing to the three irrigation methods. Three root zone irrigations were set in the thirdexperiment, analysis of suitable root zone irrigation for bubble-root irrigation. Impacts ofbubble-root irrigation were anglicized from different angles. The key conclusions are asfollows:(1) In the study of evaporation from soil and physical properties of soil, followings werediscovered. In the same level of irrigation amount, the rate of evaporation in surface irrigationwas the most, in drip irrigation it was more and in bubble-root irrigation it was the least in theearly irrigation. Then the rate of evaporation in surface irrigation was similar to that in dripirrigation, still more than that in bubble-root irrigation. That is to say, bubble-root irrigationcould bring down evaporation from soil. What’s more, bubble-root irrigation and dripirrigation prevented soil hardening. In addition, the soil could absorb water from the air atnight and improved soil water condition in bubble-root irrigation and rather than in dripirrigation or surface irrigation.(2) Bubble-root irrigation could maintain the growth of shoot and put downfruit-dropping ratio. Shoot growth and fruit-dropping ratio varied by the irrigation amount andthe arrangement of emitters. Bubble-root irrigation may maintain or improve the growth ofbearing branch.If irrigation water quota was the same, bubble-root irrigation could raise production ofjujube, water use efficiency and irrigation production. The change regularities of jujubeproduction by irrigation water quota were different in different arrangement of emitters.Irrigation water quota affected water use efficiency in irregular way. And irrigation water quota can influenced irrigation production. Low irrigation water quota caused high irrigationproduction.Surge spring irrigation did not do harm to quality of jujube. When irrigation water quotawas20L/plant, vitamin C content was the biggest among those irrigation methods. In otherconditions, compared to surface irrigation, drip irrigation and bubble-root irrigation did notincrease vitamin C content significantly. While irrigation water quota was80L/plant in pipeirrigation, soluble solids content was higher than that was20L/plant. In other conditions thatirrigation water quota was80L/plant, soluble solids contents did not rise significantly. That isto say, there is some relationships between jujube quality and irrigation water quota. It was thebest for bubble-root irrigation and drip irrigation with irrigation water quota80L/plant, whileit was relative better for pipe irrigation with irrigation water quota80L/plant.（3）In the experiment of effects of different arrangements of emitters of bubble-rootirrigation on potted jujube. Alternative partial root zone irrigation improved water absorbingability of young jujube. Different arrangement of emitters exerted an influence on shootgrowth and bearing branch of young jujube. Shoot growth was the most in alternative partialzone irrigation, more in even irrigation, the least in fixed irrigation. However, it was oppositefor bearing branch. It was the most in fixed irrigation, more in even irrigation and the least inalternative partial root zone irrigation. Compared to even irrigation, the contents of solublesugar, soluble solids and vitamin C rise in alternative partial root zone irrigation, while thosedecreased in fixed irrigation. Alternative partial root bubble-root irrigation could rise jujubequality.