On the basis of amount of nutrients required by plants, nutrients can be classified as :
1. Macro nutrients
2. Micro nutrients
1. Macro nutrients – These nutrients are required by plants in large amount. In plant tissues, t’ eir quantity is from 0.2% to 4%.
For example: carbon, hydrogen, nitrogen ‘xygen, etc. Macro nutrients are further divided into o types :
(a) Primary macro nutrients
(b) Secondary macro nutrients
2. Micro nutrients – These are the nutrients that are required in very low quantity by the plants. In plant tissues, their quantity is even less than 0.02% but they are important for the plants. Even their small amount affects the normal growth of plants.
For example: zinc, copper, iron, boron, etc.
