Changes in populations of the root-lesion nematode, Pratylenchus neglectus, following grain and forage sorghum and effect on yield

This dataset reports changes in population densities of the root-lesion nematode, Pratylenchus neglectus, over two seasons in the field in Queensland, in which 20 commercial and advanced lines of grain sorghum and 10 commercial lines of forage sorghum were grown over two years. Grain yield of the grain sorghum lines, and biomass of the forage sorghum lines were determined after the first cropping season, however drought and extreme heat destroyed the grain yields in the second year. P. neglectus population densities were measured to 150 cm soil depth before sowing in the first season and after each sorghum crop in both seasons of the trial. In the 2004-2005 trial, average initial P. neglectus populations were 1435/kg soil before sowing. Yields were obtained for the grain sorghum lines, biomass for the forage sorghum lines. Soil samples were collected after harvest in February 2005 to assess nematode populations by the Whitehead tray extraction method and identified and counted using a microscope. The 2005-2006 trial was replanted onto the plots used in the 2004-2005 trial. Grain yield was only harvested in the 2004-2005 trial; drought and extreme heat destroyed the grain yields in 2005-2006 trial. Soil samples were collected in April 2006 and reported in the following project.本数据集记录了昆士兰州田间两个生长季内根腐线虫（root-lesion nematode，Pratylenchus neglectus）种群密度的变化情况。试验周期为两年，共种植20个商用及改良粒用高粱品系、10个商用饲用高粱品系。第一季收获后，研究人员测定了各粒用高粱品系的籽粒产量与各饲用高粱品系的生物量，但第二季因干旱与极端高温导致籽粒产量完全受损。本试验两个生长季均在播种前及每次高粱收获后采集深度达150cm的土样，以测定该线虫的种群密度。2004-2005年试验中，播种前该线虫的初始平均种群密度为1435条/千克土壤。该季收获后，研究人员于2005年2月采集土样，采用怀特黑德托盘分离法（Whitehead tray extraction method）提取线虫，随后通过显微镜完成种类鉴定与种群计数。2005-2006年试验在2004-2005年的试验地块上重新开展。仅2004-2005年试验收获了粒用高粱的籽粒产量，2005-2006年试验因干旱与极端高温导致籽粒产量完全损失。2006年4月采集的土样相关数据将在后续项目中予以报道。