Grapes’ Water Consumption Mechanisn Of Vertical Tube Irrigation

Vertical tube irrigation is a new type of underground irrigation technology that combines the advantages of water saving,energy saving and anti-blocking.At prsent,most of the research on this technology is limited to indoor experimengts and the study of the infiltration characteristics of the emitters.Carriing the experimengtal research on grapes’ water consump tion mechanisn by vertical tube irrigation system,analysing the effect of virious aspects on grapes’ growth characteristics and irrigation water use,is in favour of the popularition and application of vertical tube irrigation tecnology.(1)In the meteorological factors,the daily average temperature and the grape tree growth rate and the strong correlation.During the growing period,the maximum rate of shoot growth is 8.9 cm/day,the average daily temperature is 17～22 degrees and the humidity is 81.4%～93.6%,which is the optimum temperature and humidity for shoot growth under vertical tube irrigation,and the average daily temperature is 20.5～24 degrees,the Leaf Area Index(Lai) of grape tree changed greatly when the humidity was between 77.3% and 89.4%,and the volume growth rate of grape reached the maximum when the daily average temperature rose to about 27degrees in June,the humidity is 82.4%～88.7%.The growth rate of new shoots and leaves of grapevine also changed obviously before and after rain.The growth rate of new shoots and leaves increased in the first week after rain at the stage of Germination and the earlier stage of expansion.(2)The irrigation amount of vertical tube irrigation was 1024.5 1 in the growing period,and 544 L in the fruit expanding period,which accounted for 52.7%of the total irrigation amount in the growing period,the maximum irrigation amount in two hours appeared at 9～11 o’clock every day,and the daytime irrigation amount was 1.9 times as much as the nighttime irrigation amount.A multiple linear regression equation between daily irricted irrigation amount of each phenological period of 15 trees in vertical pipe irrigation system was calculated by using the equation,and the predicted irrigation efficiency reached 86.5%,therefore,the daily irrigation simulation equation can provide a theoretical basis for the design of regional vertical pipe irrigation system for grape in the future.(3)The total irrigation amount of 15 grapevines in the whole growing period was 14.7938 M3,which was 38% less than that in the drip irrigation system,by using the equation,the predicted irrigation amount of each phenophase of 15 trees in vertical pipe irrigation system was calculated by using meteorological factors and the observed values of each growth index.The accuracy rate was 86.5%.(4)During the growing period of grape,the daily water volume of vertical tube irrigation decreased by 60% on average,and increased gradually after rainfall.The bigger the canopy volume is,the bigger the irrigation volume is.The bigger the canopy volume is,the bigger the irrigation volume is.Vertical pipe irrigation can adjust the irrigation amount at any time according to the meteorological conditions and the grape’s own growth and development,and carry on automatic irrigation.