1)Micronutrients are those which are present in very small amounts in the tissues of the plants. They are present in amounts less than 10 mmol Kg−1of dry matter. Copper, iron, manganese, molybdenum, zinc, boron, chlorine and nickel are the eight micronutrients.
2) Introduction to hydroponics:
Hydroponics is the technique of growing plants in nutrient solution without soil. Significance of hydroponics is as follows: Identification of essential elements. discovery of deficiency symptoms.
3) Need of pure water in hydroponics Since micronutrients are required only in trace quantities. Trace concentrations of these mineral nutrients are also present as impurities in water. This might lead to excessive application of a nutrient if it is present in the nutrient solution as well. Also, it will make it difficult to analyse the critical concentration of an element. Hence,pure water in hydroponics is extremely essential.