DENDROLOGY

Detailed explanation-1: -A lack of N means a lack of chlorophyll content in plants, and chlorophyll gives vegetation its vibrant green color. This is why nitrogen deficiency at early stages reveals in lighter greens. Then, a nitrogen deficiency causes green leaves to turn yellow, starting from older ones that fade prematurely.

Detailed explanation-2: -Yellow or reddish coloured leaves, stunted growth and poor flowering are all common symptoms of nitrogen, magnesium or potassium deficiency.

Detailed explanation-3: -Nitrogen deficiency causes a more general yellowing or reddening, initially usually of the older leaves, often accompanied by a lack of vigour. With potassium deficiency the yellowing is often more pronounced at the leaf edges.

Detailed explanation-4: -Stunted plant growth: Stunted plant growth is a result of the deficiencies of copper and sulphur.