SSC MTS EXAM

Detailed explanation-1: -Elements such as calcium, potassium, and phosphorus, needed by the plant in fairly large amounts are called macronutrients.

Detailed explanation-2: -Plants absorb potassium in the form of the ion K+ which dissolves readily in water. Ninety-five percent of all potassium fertilizers come in the form of muriate of potash, also known as potassium chloride.

Detailed explanation-3: -Carbon, hydrogen, oxygen, nitrogen, phosphorous and potassium are some of the essential macronutrients required by plants. Copper, iron, molybdenum, boron, zinc are the important micronutrients required by plants. Among the minerals listed in the question, nitrogen is required by plants in largest quantity.