Effect Of Pressure And Buried Depth On Soil Moisture And Growth Of Green Pepper By Moistube-irrigation

Moistube-irrigation run is a new type of underground irrigation,it is semi-permeable membrane technology to introduce irrigation areas,driven by semipermeable membrane the water potential difference,with slow,moist soil,crop root system formation of soil moist,achieve the purpose of irrigation.Micro-moistening of buried irrigation methods to avoid or substantially reduce water runoff,evaporation and seepage losses,and reduce water waste,without power consumption during operation significantly reduces operating costs.Using indoor simulation experiment method of combining and greenhouse experiments,study pressure head and pipe depth on soil moisture in irrigation and growth of green pepper;using air flow field using micro-moistening of the year studied clogged pipe,provide a reference for application of Moistube-irrigation run.Reached the following main conclusions:(1)Moistube-irrigation in clay loam in wet body shapes approximate circle;Presented for micro embellish wet body upper tube is small,the shape of the bottom is bigger;In this experimental conditions,the irrigation soil moist body cross sectional area and the relationship between the infiltration time can use the exponential function fitting,the fitting effect is good.The greater the pressure head,micro embellish irrigation wetting body cross-sectional area,the greater the humid and the higher the average moisture content in the body;Duct tape the increase of buried depth on embellish irrigation wetting body shape size effect was not significant;Wet body with the increase of the micro embellish depth moves down.(2)Moistube-irrigation wetting front in horizontal,vertical,straight down three direction of migration distance along with the change of infiltration time conforms to power function relationship.The greater the pressure head wet body in three directions of the bigger the migration distance.The duct tape shallow depth,the irrigation wetting body upward migration to the surface,is not conducive to small evaporation loss;Duct tape is buried deeply 20 cm when wet body vertical downward migration distance did not change significantly.Micro run under the condition of irrigation infiltration rate began to change over time by the infiltration time fell sharply,as the extension of infiltration time,curve gradually flatten out.The greater the pressure head,the greater the cumulative infiltration amount,infiltration rate.With the increase of duct tape buried depth,cumulative infiltration volume has a decreasing trend.(3)Moistube-irrigation in moist soil water content decreases with the increase of distance from micro embellish tube,is the distribution of high edge and low in the middle.Near the wet body internal micro embellish tube the highest water content,water content is close to field capacity,wet saturated moisture content area does not exist in the body;Same distance from micro embellish tube,vertical direction of soil water content of the soil moisture content is less than the vertical downward direction.The higher the pressure head wet body moisture content is higher;Duct tape is buried deep impact on the micro irrigation wet embellish body moisture content was not significant.(4)Moistube-irrigation pressure head and humid wet body scope and the average water content in the body was positively than relationships.Pressure head to the influence of green pepper plant height,stem diameter growth curve conforms to the Logistic model;Micro embellish filling and pressure head of green peppers fertility early crop plant height growth rate effect is more significant;Micro irrigation conditions,green pepper growth and development of appropriate work pressure head is 150 cm,pressure head is 100 cm,green pepper irrigation water utilization rate of the highest.(5)The embedded depth of duct tape on micro embellish wet irrigation water content was not significant,the influence of the soil moist bodies with the increase of duct tape buried depth and move down;Duct tape buried depth on green pepper plant height,stem diameter growth along with the change of time conforms to the Logistic model;Micro irrigation conditions,green pepper growth and development of appropriate duct tape is buried deeply 20 cm,under the embedded depth of processing,green pepper plant height,stem diameter,yield are the largest,the highest green pepper irrigation water productivity.(6)The greater the pressure head,micro embellish tube in the air out of the greater the flow;Moistube-irrigation tube in the air flow rate and water supply time there was a positive linear relationship;Under this experimental condition,the use of a year of micro embellish jam phenomenon in a pipe,the flow rate is only 15.9% of that in the new tube in the air;Micro visible impurities on embellish tube clogged little impact;By high pressure water filling of the old micro embellish tube in the air to flow is improved obviously.High pressure water filling time is 4 hours is relatively appropriate,more outstanding the old micro embellish tube accumulated flow rate increased by 295%,62.8% of new micro embellish tube air flow.