Agronomic Calendars for the Bushland, Texas Sorghum Datasets

This dataset consists of agronomic calendars for each growing season (year) when sorghum [Sorghum bicolor (L.)] was grown for grain or forage at the USDA-ARS Conservation and Production Laboratory (CPRL), Soil and Water Management Research Unit (SWMRU) research weather station, Bushland, Texas (Lat. 35.186714°, Long. -102.094189°, elevation 1170 m above MSL). Sorghum was grown in 1987, 1988, 1991, 1993, 1997 through 1999, 2003 through 2007, 2014, and 2015. Depending on experimental objectives, sorghum was grown on one, two, or four large, precision weighing lysimeters, each in the center of a 4.44 ha square field. The four fields were contiguous. The fields were designated northeast (NE), southeast (SE), northwest (NW), and southwest (SW), and were themselves arranged in a larger square with the fields in four adjacent quadrants of the larger square. In 2003 and 2004, cotton was grown on only one large weighing lysimeter in rotation with sorghum. In 2015, the NE and SE fields were irrigated with subsurface drip lines and the NW and SW fields were irrigated with a linear move sprinkler. Irrigation was by linear move sprinkler system in 1987 through 2007. Sorghum was sometimes grown as a dryland crop, sometimes as a fully irrigated crop, and sometimes as a deficit irrigated crop. Irrigations designated as full 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. Irrigations designated as deficit typically involved full irrigation to establish the crop. A crop calendar for each season lists by date the pertinent agronomic and maintenance operations (e.g., planting, thinning, fertilization, pesticide application, lysimeter maintenance, harvest). For each season there is one crop calendar for each two lysimeters (NE and SE, and/or NW and SW).
These datasets originate from research aimed at determining crop water use (ET), crop coefficients for use in ET-based irrigation scheduling based on a reference ET, crop growth, yield, harvest index, and crop water productivity as affected by irrigation method, timing, amount (full or some degree of deficit), agronomic practices, cultivar, and weather. Prior publications have focused on ET, crop coefficients, and crop water productivity. Crop coefficients have been used by ET networks. The data have utility for testing simulation models of crop ET, growth, and yield and have been used for testing, and calibrating models of ET that use satellite and/or weather data.
See the README for descriptions of each data file.

本数据集包括在农业研究服务局-美国农业部自然资源保护与利用研究实验室（Conservation and Production Laboratory，简称CPRL）土壤与水资源管理研究单元（Soil and Water Management Research Unit，简称SWMRU）研究气象站，位于德克萨斯州布什兰（Bushland, Texas，经纬度分别为35.186714°N，-102.094189°E，海拔1170米）种植高粱（Sorghum bicolor (L.)）作为谷物或饲料的每个生长季节（年份）的农业日历。高粱的种植年份为1987年、1988年、1991年、1993年、1997年至1999年、2003年至2007年、2014年和2015年。根据实验目标，高粱种植在一至四个大型、精密称重水分渗漏室中，每个渗漏室位于4.44公顷正方形田地的中心。四个田地相互毗邻。田地被指定为东北（NE）、东南（SE）、西北（NW）和西南（SW），并且这些田地本身按照更大的正方形排列，位于更大正方形四个相邻象限中。在2003年和2004年，仅在一块大型称重水分渗漏室中轮作种植棉花。在2015年，NE和SE田地通过地下滴灌系统灌溉，而NW和SW田地通过线性移动喷灌系统灌溉。1987年至2007年间，灌溉通过线性移动喷灌系统进行。高粱有时作为旱作种植，有时作为完全灌溉作物种植，有时作为缺水灌溉作物种植。标记为完全的灌溉管理旨在每周或更频繁地补充作物使用的土壤水分，这由使用中子探针在田间2.4米深处的土壤剖面水分含量读数确定。标记为缺水的灌溉通常涉及建立作物时进行完全灌溉。每个季节的作物日历按日期列出相关的农业和维护操作（例如，播种、疏苗、施肥、农药应用、水分渗漏室维护、收获）。对于每个季节，每个两个水分渗漏室（NE和SE，以及/或NW和SW）都有一个作物日历。这些数据集源自旨在确定作物水分利用（ET）、基于参考ET的ET-based灌溉调度中的作物系数、作物生长、产量、收获指数以及受灌溉方法、时间、数量（完全或一定程度缺水）、农业实践、品种和天气影响的作物水分生产力的研究。先前的研究出版物主要集中在ET、作物系数和作物水分生产力上。作物系数已被ET网络使用。这些数据对于测试作物ET、生长和产量的模拟模型以及用于测试和校准使用卫星和/或天气数据的ET模型具有实际效用。有关每个数据文件的描述，请参阅README文件。