abstract |
Plants suffering from micro-nutrient deficiences are treated with prussiates of the formula Ma [Fe(CN)5X]b IN WHICH M is an alkali metal ion, alkaline earth metal ion, heavy metal ion, ammonium ion or hydrogen, X is a group which can occupy the sixth coordination position on the iron, or a suitable organic radical, A IS 2, 3, 4 OR 5, AND B IS 1, 2 OR 3. |