Effect Of The Burying Depth Of Subsurface Drip Irrigation On Transport Of Soil Water And Growth Characteristics Of Tall Fescue

Compared with turf spray irrigation system, the subsurface drip irrigation(SDI) is better in water saving and management. In order to study the change rule of subsurface drip irrigation emitter discharge, the experiment scheme was arranged based on a uniform design with mix levels of three factors such as work pressure of emitter, soil bulk density and initial soil water content as the three treatment factors. In order to identify the proper irrigation quantity and emitter burying depth of subsurface drip irrigation, the soil-water distribution of subsurface drip irrigation and turfgrass growth characteristics were observed and analyzed by using the simulative experiment and filed trial. The results showed that the work pressure was the main factor for hydraulic characteristics of SDI emitter. The influences of soil bulk density and initial soil water content on SDI emitter discharge were not remarkable. When the flowing rate and irrigation time was under a certain circumstances, as the increase in the burying depth, the wetting front migration distance decreased in the vertical direction and increased in the horizontal direction. For the same depth, the water content distribution is symmetrical on both sides from the emitter. The aboveground biomass under the 20cm burying depth treatment was significantly higher than those under other treatments in quick growth stage (P<0.05). No significant effect of burying depth on plant density was detected. There was no significant effect of burying depth on the underground biomass and root distribution, but the root density increased at each burying depth of drip irrigation emitter. The different irrigation quantity has significant effect on growth rate and underground biomass of Tall Fescue.