Plants are held in place so their roots lie in soilless troughs, and water with dissolved nutrients is circulated over them.
其方法是:把作物固定在无土水槽里扎根,溶解在水里的营养液在根系周围循环。
2
EHEC has also been isolated from bodies of water (ponds, streams), Wells and watertroughs, and has been found to survive for months in manure and water-trough sediments.