Today an interesting question came up on how to know which soil will have nematodes?
It was mentioned that soil near plants have nematodes. But @Himanshu asked why the soil near plants have nematodes, upon looking at the literature it was found that it is alluvial soil which is present near plants, and it is moist as well has lot of humus or nutrients which is good for bacteria, and as nematode survives on bacteria, hence soil near plants is suitable for isolating nematodes.
Further, cubists had poured some water on the nematode setup, as told by a colleague. The point came why do we have to add water on soil of nematode isolation setup, just because someone said?
this was a goof up in the experiment and also the problem in designing the experiment.
We further discussed the logic behind potato-soil setup to isolate nematodes and why the soil near plants has a water retaining capacity, and need not be watered.
Some question on do we find nematodes in sand (near sea) was asked, do we think nematodes wont be present in sand near the beach? do beach sand don’t have bacteria for nematodes to feed on? do we have any evidence to show there are no nematodes in beach sand?
The setup of potato-soil for isolating nematodes. Notice the water sprinkled on soil as a goof up beiung discussed.