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为查明用排水暗管调节土壤湿度的可能性,自1960年至1973年,在拉脱维亚共和国的五个不同试验点上,进行了专门的研究。各试验点的简要情况是:第一试验点——拉脱维亚农业科学院原试验农场,面积 F=5公顷,暗管间距 E=25米,土壤渗透系数 K=0.6～2.6米/昼夜,粒状滩地;第二试验点——库尔迪加省集体农庄,F=3.2公顷,E=34和36米,K=1.5～2.6米/昼夜,泥炭土和砂土;第三试验点——拉脱维亚农业科学院
To ascertain the possibility of regulating soil moisture with drainage ducts, special studies were conducted at five different points in the Republic of Latvia from 1960 to 1973. The first test point - Latvian Academy of Agricultural Sciences, the original experimental farm, an area of F = 5 hectares, dark tube spacing E = 25 meters, soil permeability coefficient K = 0.6 ~ 2.6 m / day, granular beach; Second test site - Collective farm in Kuldiga province, F = 3.2 ha, E = 34 and 36 m, K = 1.5-2.6 m / day, peat soil and sand; Third test point - Latvian Academy of Agricultural Sciences