Optimising Plant Establishment 2020 Hart Canola Experiment

Data from the 2020 crop establishment trial at Hart, SA. The trial compared the establishment of canola at different seeding rates, under a conventional seeder and under a precision seeder. This experiment was run under the UOA1803-009RTX GRDC research project led by the University of Adelaide, and the experiment and data collection were managed locally by the Hart Field-Site Group.Files:2020 Hart Canola.xlsxExperiment setup:Experiment managed locally by the Hart Field-Site Group. The trial was organised as a split plot design, with 3 whole plot treatments (conventional seeder, precision seeder, and perfect placement (i.e. handthinned plots curated to consistent interplant distance after emergence)), and three subplot treatments for the seeding rate (15, 25 and 40 seeds/m2). The design was arranged spatially in a single column and 36 rows, 4 replicates, 36 plots in total.Variables recorded:stubble (%), stubble (t/ha), establishment count (plants/m2), seedling depth (mm), interplant distance (cm), GS75 biomass dry matter (t/ha), harvest biomass wet weight (g), harvest biomass dry weight (g), harvest index, yield (t/ha), oil (%), 500 grain weight (g)Data collection and assessment:The paddock was seeded on 05/05/2020, with a stubble assessment within the plots on 13/05/2020. Plant emergence counts were made on 25/05/2020, 12/06/2020 and 07/07/2020 to assess establishment. Seedling depth in mm was also measured on 07/07/2020 for plots in replicate 4, with five measurements made per plot. Interplant distances were recorded at each plot in cm. NDVI was measured on 30/06/2020, 09/07/2020, 21/07/2020 and 03/08/2020. Biomass cuts were made on 09/09/2020 at Growth Stage 75 and the dry matter weight recorded, and harvest maturity cuts were made on 29/10/2020 to assess weight and harvest index. The crop was harvested on 04/11/2020, with the yield (t/ha), oil content and 500 grain weight recorded. Additionally, some photos were taken of the trial and stubble during the crop growth, and these are available embedded in the xlsx file.

本数据集来源于南澳大利亚州（SA）哈特（Hart）地区2020年作物建植试验。该试验对比了常规播种机与精密播种机在不同播种密度下的油菜建植效果。本试验隶属于阿德莱德大学牵头的UOA1803-009RTX GRDC研究项目，试验与数据采集工作由哈特田间站点小组（Hart Field-Site Group）本地负责。文件：2020 Hart Canola.xlsx

试验设置：本试验由哈特田间站点小组本地管理，采用裂区试验设计：主区处理共3组，分别为常规播种机、精密播种机以及理想定植模式（即出苗后人工间苗至株距一致的小区）；副区处理为3种播种密度：15、25、40粒/平方米。试验空间布局为单排36行，设置4次重复，总计36个小区。

记录变量：留茬率（%）、留茬生物量（t/ha）、建植株数（株/平方米）、幼苗埋深（mm）、株间距离（cm）、GS75期生物量干重（t/ha）、收获期生物量鲜重（g）、收获期生物量干重（g）、收获指数、产量（t/ha）、含油率（%）、500粒种子重量（g）

数据采集与评估：试验田于2020年5月5日完成播种。2020年5月13日完成小区内留茬情况评估；分别于2020年5月25日、6月12日、7月7日开展出苗计数以评估建植效果。2020年7月7日对第4次重复的小区测定幼苗埋深，每小区采集5组数据。各小区均记录株间距离（cm）。归一化差异植被指数（NDVI）测定分别于2020年6月30日、7月9日、7月21日、8月3日完成。2020年9月9日（作物生长阶段GS75）开展生物量取样，记录干物质重量；2020年10月29日开展收获期取样以评估生物量重量与收获指数。作物于2020年11月4日完成收获，记录产量（t/ha）、含油率及500粒种子重量（g）。此外，试验期间拍摄了部分作物生长与留茬情况的照片，已内嵌至该xlsx文件中。