Give deficiency symptoms of following elements in plants :(a) Potassium (K+)(b) Magnesium (Mg++)(c) Boron (BO33–)

Answer:

(a) Potassium: mottled chlorosis and scorching (necrosis) of the tips and margins of older leaves, weak stems (lodging), shortened internodes and reduced resistance to diseases.

(b) Magnesium: interveinal chlorosis beginning in older leaves (Mg is a constituent of chlorophyll), followed by necrotic spots and premature leaf fall.

(c) Boron: death of the shoot tip and root tip (apical meristems), stunted growth, brittle leaves, poor pollen germination, flower and fruit drop; disorders such as heart rot of beet and internal cork of apple.