1litre Canna Mono Nitrogen. 20% Nitrogen Product Details: 1litre Canna Mono Nitrogen 20% Nitrogen for treating nitrogen deficiencies. Please be aware that in almost all situations a magnesium deficiency is a symptom of a more general deficiency in all elements caused most likely by inproper mixing of your base nutrients. Before resorting to using 1litre Canna Mono Nitrogen 20% Nitrogen attempt mixing a fresh batch of nutrient ensuring correct levels are attained, ideally by checking with a suitable EC metre. This may fix your problem, wheras using 1litre Canna Mono Nitrogen 20% Nitrogen could make it worse.