Yellow-green poisonous and pungent smelling gas (Cl) or element. The name (chlôrós = green) is derived from the yellow-green color of the chlorine gas. Due to its responsiveness, it does not occur in nature in elemental form, but mainly in the form of salts as sodium chloride (table salt) and potassium chloride. As nutrient will it be from Rebstock if at all needed in small quantities. A shortage in the vineyard hardly occurs. Young vines react very sensitively to a not so rare excess income deducted, Therefore, it should be a necessary potassium fertilization in the form of potassium chloride (two-component fertilization) only in very high doses or in the form of potassium sulfate. Organic chlorine compounds are harmful to health and particularly toxic to insects and are therefore considered to be insecticides used.