Data from: Combining ability of experimental maize lines for yield and aflatoxin in the southeastern USA

# Data from Combining Ability of Experimental Maize Lines for Yield and Aflatoxin in the Southeastern USA --- This dataset contains all raw data from all four years of the study in Excel (.xlsx) format. Missing data are represented by a dash (-). Male and female parents of commercial hybrids are unknown and are thus coded as missing data. ## Description of the data and file structure Data from each individual experiment are presented in individual tabs. In 2014 and 2015, two separate experiments for yield (tabs 2014yld and 2015yld, respectively) and aflatoxin (tabs 2014afla and 2015afla, respectively) were conducted. Other agronomic traits, such as plant height, ear height, etc. were assessed in the 2014 and 2015 yield trials and are available in the 2014yld and 2015yld tabs. In 2018 and 2019, yield and aflatoxin were assessed within the same experiment along with other agronomic traits. These data are available in tabs 2018all and 2019all. Data are reported under the following column headings: * Plot_ID Unique plot number assigned within a year. * Rep Replication number. Each experiment contained four replications. * Range and Row. The unique position of each plot within the field can be defined by these two coordinates. * Entry# - Unique number assigned to each pedigree within a year. * Pedigree Pedigree for each specific entry or commercial name for checks. * P_female Female parent * P_male Male parent * Stand Number of plants in the two-row plot. 72 seeds were planted in each plot. * Ear_ht Height (cm) from ground to node of the primary ear * Plant_ht Height (cm) from ground to tip of the tassel * EP_Ratio Ratio of ear height to plant height * Anthesis Days from planting until 50% of anthers are shedding pollen * Silk Days from planting until 50% of silks are exposed * ASI Anthesis-silking interval days between anthesis and silking * %*Moisture Grain moisture at harvest as measured by the combine * Plot_Wt_lbs Raw plot weight (lbs) of grain as measured by the combine * TWT* lbs/bu Grain test weight (lbs/bu) as measured by the combine * kg_ha_15 Grain yield in kg/ha adjusted to 15% moisture * Lodging Total number of lodged plants. In 2018 and 2019, stalk lodging and root lodging were counted separately. * %_lodging Total percentage of lodged plants * 5_ears_g In 2018 and 2019, the shelled weight (g) of the five ears sampled for aflatoxin analysis * 5_ears_lbs - In 2018 and 2019, the shelled weight (lbs) of the five ears sampled for aflatoxin analysis * Plot_total_lbs In 2018 and 2019, the total weight of grain harvested from the plot (combine wt. + shelled ears) * Afla_ppb Grain aflatoxin concentration (ppb, or ng/g) determined by the Vicam Aflatest procedure * Log_afla+1 Aflatoxin concentration log-transformed as y = log(x + 1)

# 美国东南部试验玉米自交系产量与黄曲霉毒素配合力数据集
本数据集包含该研究四年间的全部原始数据，格式为Excel（.xlsx）。缺失数据以短横线（-）表示。商用杂交种的父本与母本信息未知，因此编码为缺失值。

## 数据与文件结构说明
每项独立试验的数据均存储于单独的工作表中。2014年与2015年分别开展了两项独立试验：产量试验（对应工作表2014yld与2015yld）与黄曲霉毒素试验（对应工作表2014afla与2015afla）。在2014与2015年的产量试验中，还评估了株高、穗位高等其他农艺性状，相关数据收录于2014yld与2015yld工作表中。2018年与2019年则将产量、黄曲霉毒素及其他农艺性状的评估整合在同一项试验中，相关数据分别存储于工作表2018all与2019all。

数据列说明如下：
* 地块编号（Plot_ID）：年度内分配给每个地块的唯一编号。
* 重复编号（Rep）：重复次数编号。每项试验均设置4次重复。
* 列位（Range）与行位（Row）：通过这两个坐标可确定每个地块在试验田中的唯一空间位置。
* 材料编号（Entry#）：年度内分配给每个遗传系的唯一编号。
* 系谱信息（Pedigree）：每份材料的系谱名称，或对照材料的商品名。
* 母本（P_female）：试验材料的雌性亲本。
* 父本（P_male）：试验材料的雄性亲本。
* 保苗株数（Stand）：两行地块中的植株总数。每个地块播种72粒种子。
* 穗位高（Ear_ht）：地面至果穗着生节位的高度，单位：厘米。
* 株高（Plant_ht）：地面至雄穗顶端的高度，单位：厘米。
* 穗株比（EP_Ratio）：穗位高与株高的比值。
* 散粉期（Anthesis）：自播种至50%植株散粉的天数。
* 吐丝期（Silk）：自播种至50%雌穗吐丝的天数。
* 散粉-吐丝间隔期（ASI，Anthesis-silking interval）：散粉与吐丝之间的天数差。
* 籽粒含水量（%*Moisture）：联合收割机测定的收获时籽粒含水量。
* 地块籽粒原始重量（Plot_Wt_lbs）：联合收割机测定的地块籽粒原始重量，单位：磅。
* 籽粒容重（TWT* lbs/bu）：联合收割机测定的籽粒容重，单位：磅/蒲式耳。
* 标准化籽粒产量（kg_ha_15）：调整至15%含水量后的籽粒产量，单位：千克/公顷。
* 倒伏总株数（Lodging）：试验地块内的倒伏植株总数。2018年与2019年试验中分别统计了茎倒伏与根倒伏情况。
* 倒伏率（%_lodging）：倒伏植株占总植株数的百分比。
* 5穗脱粒样品重量（g）（5_ears_g）：2018年与2019年试验中，用于黄曲霉毒素分析的5个果穗脱粒后的重量，单位：克。
* 5穗脱粒样品重量（lbs）（5_ears_lbs）：2018年与2019年试验中，用于黄曲霉毒素分析的5个果穗脱粒后的重量，单位：磅。
* 地块总籽粒重量（Plot_total_lbs）：2018年与2019年试验中，地块收获的总籽粒重量，为联合收割机称重重量与脱粒果穗重量之和。
* 黄曲霉毒素浓度（Afla_ppb）：采用Vicam Aflatest方法测定的籽粒黄曲霉毒素浓度，单位：ppb（即纳克/克）。
* 黄曲霉毒素对数转换值（Log_afla+1）：经公式y = log(x + 1)转换后的黄曲霉毒素浓度值。