If its coloring pale-green, leaves turn yellow, their sizes small and early fall down, means, in soil there is no nitrogen.
When a plant does not suffice potassium, the tissue along the edges of leaves turns yellow or brown and dies off, twists from top to bottom, rugosity of leaves is observed.
Dark green, bluish coloring of leaves, their red-purple shading sets, dark, sometimes almost black colour of drying up leaves denote to phosphoric starvation of a plant.
At a calcium lack prematurely die off top buds and roots.
Changing of green coloring of leaves to yellow, red, violet at edges and between nerves is often observed. It is a true sign of a lack of magnesium.
At shortage of iron leaves get pale-green coloring, a tissue does not die off.
About requirement of plants for copper speaks dimness of tips of leaves.
If in soil there is not enough boron die off top buds and rootlets, leaves fall down, plants do not blossom.