Soil salinity in 1975 in an irrigated district watered by the 2nd and 3rd sections of the first part of Monegros Canal (Huesca, Spain)

Salinity is a time-variable characteristic trait of the soils, as is well known in the irrigated lands. Tracking the variation of soil salinity along time is a way to evaluate the effects of irrigation in agricultural lands or in their surroundings. Such evaluations can enable warning and even implementing corrective actions if salinity underwent undesirable evolution. The data presented here come from a heritage report commissioned by IRYDA, the organism in charge of new irrigation projets within the Spanish Ministry of Agriculture. We have organized the data in three files: • File "Augerings 1975 Monegros.docx", a list of the 519 soil samples taken by hand-auger in 1975 at 183 sites. The list shows the refernce of the sampling site, the depth of each sample, the electrical conductivity at 1:5 dilution, and the pH at 1:1 dilution; • File "Coordinates 1975 Monegros.docx", the UTM coordinates of the sampling sites; and • File "Marked contacts CETFA Monegros1972 and diagram.zip”, the scannings in pdf format of the 176 contacts aerial photographs from a flight of 1972 that have marks of the surveyors for the localization of the sampling sites. This zip file also contains the flight diagram in pdf format. The time elapsed and the changes in the irrigation techniques in the district, where now is becoming majoritarian the pressurized application of water, reinforce the interest of this dataset for multitemporal evaluations with agronomical or environmental purposes.土壤盐分是随时间变化的土壤特性，这在灌溉农田中已是共识。追踪土壤盐分随时间的变化，是评估农田及其周边区域灌溉效应的有效手段。若土壤盐分出现不良演化趋势，此类评估可辅助开展预警乃至实施纠正措施。 本次发布的数据源自西班牙农业部负责新灌溉项目的主管机构IRYDA委托编制的存档历史报告。我们将数据整理为三个文件： • 文件"Augerings 1975 Monegros.docx"：收录了1975年在183个采样点通过人工取土钻采集的519份土壤样本信息，内容包含采样点标识、每份样本的采集深度、1:5土水比浸提液的电导率，以及1:1土水比浸提液的pH值； • 文件"Coordinates 1975 Monegros.docx"：包含各采样点的UTM（通用横轴墨卡托）坐标； • 文件"Marked contacts CETFA Monegros1972 and diagram.zip"：内含1972年一次航空摄影获取的176张航片扫描件（PDF格式），这些航片带有测绘人员标注的采样点定位标记，该压缩包还附带了本次航空测绘的飞行示意图PDF文件。 该区域随时间推移，灌溉技术已发生显著变革，目前加压输水灌溉已成为主流应用方式。这一背景进一步提升了本数据集在农艺或环境领域多时间尺度评估研究中的应用价值。