The kit consists of a plant culture medium which contains all the elements required by the plant as well as a range of mixtures which are deficient in one element only.These media are provided in powder form and are simply added to water before use.A clear demonstration of deficiency diseases can be given by growing seedlings or cuttings in the various solutions following the full experimental details which are supplied.The Plant Culture Kit contains:5 x pots of Plant Culture Medium8 x pots of Sach's Water Culture Medium (Complete and lacking in Calcium Magnesium Potassium Nitrogen Phosphorus Iron & Sulfur)