Crinkling and downward cupping (or hooding) of young leaf blades are the first signs of deficiency. The leaf blade may be nearly normal in size with little crinkling, or, as deficiency increases, it can be reduced in size to a mere stub of "blackened" tissue at the end of the petiole. These symptoms, often called "tip burn," are seen on plants in fields where plant growth is extremely vigorous. They usually disappear with a decrease in the supply of nitrogen from the soil, or a change of climate or growth stage. When calcium deficiency remains chronic, the growing point is often permanently damaged, and lateral shoots develop abnormally. Such a condition can produce damage to the conducting system and cambial layers of the storage root, as seen by a darkening of tissues in a cross section followed by a permanent wilting of the top, then death of the plant. Also, without calcium in the root environment,  roots fail to grow.