这些研究人员进行了三次温室试验，以确定弗吉尼亚州纽波特纽斯哈伍德磨坊水处理厂的明矾污泥对羊茅生长和化学成分的影响。羊茅产量随着污泥添加量的增加而降低，这一趋势归因于较高负荷下植物有效磷（P）的减少。补充磷肥纠正了这一缺陷。石灰添加量不影响产量。污泥中锰和铜的存在增加了植物对金属的吸收，但不影响产量。包括14个参考文献、表格和图表。

These investigators conducted three greenhouse experiments to determine the impact of alum sludge from the Harwood's Mill water treatment plant, Newport News, Virginia, on the growth and chemical composition of fescue grass. Fescue yields decreased with increased sludge addition, a trend that was attributed to reductions in plant-available phosphorus (P) at higher loadings. Supplemental P fertilization corrected this deficiency. Lime addition did not affect yield. The presence of manganese and copper in the sludge increased metal uptake by the plants but did not affect yield. Includes 14 references, table, figures.