Effect of drip irrigation emitters parameters on wetting process of sandy soil
Clarifying the impact of emitter characteristic parameters and soil particle size composition on the wetting process is basis for designing drip irrigation systems.The effects of emitter flow(1,3,and 6 L/h),irrigation volume(5,10,and 20 L),and film covering on the AQTV of sandy soil with different particle size composition were investigated in this study.It proposed to use the average quantity of irrigation in the per-unit time and unit-wet volume(AQTV)to quantify the soil wetting process(Beijing Daxing DX,Inner Mongolia Wumeng WM,Xinjiang Jiashi JS,Inner Mongolia Chifeng CF).The results indicate that the AQTV of sandy loam soil with different particle size composi-tions increases with the increase of irrigation flow rate,and it shows a significant negative correlation with the proportion of soil particles in the particle size range of(0.100,0.250]mm(P<0.05).The AQTV in the four different types of sandy loam soil also shows a trend toward a gradual decline trend with an increase in irrigation amount.The content of clay particles≤0.002 mm and(0.500,1.000]mm sand components and AQTV have a strong positive link when the irrigation volume is 5 L and 10 L,20 L,respectively.The improvement in AQTV of the DX,WM and CF treatments with film mulching drip irrigation may be attributable to the relatively large sand or clay particles in the three types of sandy loams.In addition,when the distance between emitters increases,the intersection area,water content,and horizontal and vertical soaking distance of soil water are reduced.
万方数据
维普
