SOYBEAN TISSUE SAMPLING

SOYBEAN TISSUE SAMPLING


I’m Nathan Slaton with the
University of Arkansas Division of Agriculture. We’re in the middle of a
soybean field today because this soybean field has a
problem. Plants, just like humans, sometimes get sick
and need to see a doctor. Sometimes we have to sample
the tissue and send it into a lab in order to get an accurate
diagnosis of the problem. First thing when we get into the
field, we also want to take note of the growth stage. Whether it
has blooms, how many nodes it has, whether there’s pod, and if
there are pods, how well developed they are. When we are trying to sample
the tissue, the first question is, what part of the plant do we
sample? Well, we could take the whole plant, but in this
particular case it’s not required. For plants of this size, what we
need to do is to find the growing point and look at the
leaves from the start and you can see that this particular leaf
is not mature. It is still expanding and growing, so we
don’t want to sample this leaf. This leaf is also still expanding,
so when we go down one more node, we find a mature, what
we call trifoliate leaf and for soybean, that’s what we want is
a mature trifoliate leaf towards the top of the plant. Once we have located those
leaves, you can take a couple of those if you’d like, but we just
pinch the trifoliate leaf off of what is called the petiole. We
leave the petiole on the plant and we take the trifoliate leaf. Once we have collected these
leaves, we would then encourage you to put them in a
paper sack, because the first thing that the laboratory does is
we’re going to dry them when the lab receives it, so you put
those leaves in a paper sack, put it on your dashboard, let
the heat of the day dry them out before you mail them or
deliver them to your county extension office. So if you need further
assistance, find us at uaex.edu or contact your local county
extension office.