Evapotranspiration, Irrigation, Dew/frost - Water Balance Data for The Bushland, Texas Sunflower Datasets

This dataset contains water balance data for each year when sunflower was grown at the USDA-ARS Conservation and Production Laboratory (CPRL), Soil and Water Management Research Unit (SWMRU), Bushland, Texas (Lat. 35.186714°, Long. -102.094189°, elevation 1170 m above MSL). Sunflower was grown on two large, precision weighing lysimeters, each in the center of a 4.44 ha square field in 2009 and 2011. Irrigation was by linear move sprinkler system. Full irrigations were managed to replenish soil water used by the crop on a weekly or more frequent basis as determined by soil profile water content readings made with a neutron probe to 2.4-m depth in the field. Deficit irrigations were less than full - see crop calendars and irrigation data in these files for details. The weighing lysimeters were used to measure relative soil water storage to 0.05 mm accuracy at 5-minute intervals, and the 5-minute change in soil water storage was used along with precipitation and irrigation amounts to calculate crop evapotranspiration (ET), which is reported at 15-minute intervals. Because the large (3 m by 3 m surface area) weighing lysimeters are better rain gages than are tipping bucket gages, the 15-minute precipitation data are derived for each lysimeter from changes in lysimeter mass. The land slope is

本数据集包含了在美国农业部-ARS保护与生产实验室（CPRL）、土壤与水资源管理研究单位（SWMRU）布什兰德，德克萨斯州（纬度35.186714°，经度-102.094189°，海拔1170米以上海平面）种植向日葵每年所积累的水分平衡数据。向日葵种植于两个大型的精密称重渗漏池中，每个渗漏池位于4.44公顷正方形地块的中心，种植年份为2009年和2011年。灌溉系统采用线性移动喷灌系统。全面灌溉以每周或更频繁的频率补充作物所消耗的土壤水分，具体频率由使用中子探针在田间进行的土壤剖面含水量读数决定，深度达2.4米。缺水灌溉少于全面灌溉——详细信息请参阅这些文件中的作物日历和灌溉数据。称重渗漏池用于测量相对土壤水分储存，精度至0.05毫米，每隔5分钟进行一次测量，并利用土壤水分储存的5分钟变化量，结合降水量和灌溉量，计算作物蒸散量（ET），报告频率为每15分钟一次。由于大型（3米×3米表面积）的称重渗漏池相较于翻斗式雨量计，是更好的降雨测量工具，因此，每个渗漏池的15分钟降水量数据是通过渗漏池质量的变化来推算的。地块坡度