Influence of Key Technical Parameters of Subsurface Drip Irrigation to the Root System and Yield of Alfalfa
In order to study the suitable drip head flow,buried depth and irrigation quota of alfalfa under subsurface drip irrigation,field ex-periments were carried out to study the single factor effects of key technical parameters of subsurface drip irrigation on alfalfa root system and yield by setting three drip irrigation areas with drip head flow(1.38,2.00 and 3.00 L/h),three buried depths of drip irrigation area(10,20 and 30 cm)and three subsurface drip irrigation water quota(15.0,22.5 and 30.0 mm).The results show that when the drip flow rate is 2.00 L/h,the growth of alfalfa root system is more favorable and the buried depth of drip irrigation has a significant effect on lateral roots of alfalfa.Irrigation quota has significant effects on specific root surface area,root tip number,lateral root occurrence number and lateral root position of alfalfa.The yield of alfalfa treated with small drip flow is generally higher than that treated with large drip flow.The buried depth of drip irri-gation area has no significant effect on alfalfa yield.In a certain range,the yield of alfalfa is increased gradually with the increase of irrigation quota.Considering the factors of water saving and yield,it is suggested that the key technical parameters of alfalfa subsurface drip irrigation in Etoke Qianqi area of Ordos are as follows:The drip head flow is 2.00 L/h,the buried depth of drip irrigation area is 20 cm,and the irri-gation quota is 22.5 mm.
subsurface drip irrigationalfalfadrip flowburied depth of drip irrigation areacrop root
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