Final answer:
The provided reference materials do not specify a required soaking time for cut potatoes before they are taken out to the line. The typical soaking time can vary depending on the recipe and purpose, with no exact time given in the context of the information about cowpea seeds or potato spindle tuber viroid (PSTV) infections.
Step-by-step explanation:
The question about how long cut potatoes should be soaked in cold clear water does not pertain to the details given regarding cowpea seeds and their experimental treatment in relation to M. incognita, nor does it relate to the information about the potato spindle tuber viroid (PSTV) infections. Typically, cut potatoes can be soaked in cold water for several minutes to a few hours depending on the recipe and purpose, such as to remove excess starch or prevent browning. However, the provided reference materials do not specify the required soaking time for cut potatoes before they are taken out to the line.
It's important to ensure that potatoes are treated properly before cooking or processing to avoid issues like PSTV, which was mentioned as being spread through infected cutting tools. While the potato spindle tuber viroid is a concern, it does not directly inform the soaking time for potatoes. Therefore, without additional context or guidelines specific to the recipe or process, an exact time cannot be provided.