Answer:
Plant can tolerate a
specific amount of micronutrients. A slight lesser amount of it can cause
deficiency symptoms and a slight higher amount can cause toxicity. The mineral
ion concentration which reduces the dry weight of the tissues by 10% is called
toxic concentration.
This concentration
is different for different micronutrients as well as for different plants, e.g.,
is toxic beyond for soyabean and
beyond for sunflower.
It has also
been observed that the toxicity of one micronutrient causes the deficiency of other
nutrients. To overcome such problems, farmers should use these nutrients in prescribed
concentration so that the excess uptake of one element do not reduce the uptake
of other element.
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