Question
Biology Question on soil as reservoir of essential elements
Which of the following groups of elements have critical elements?
A
nitrogen, phosphorus, potassium
B
oxygen, nitrogen and hydrogen
C
zinc, iron and copper
D
chlorine, iron and hydrogen
Answer
nitrogen, phosphorus, potassium
Explanation
Solution
The mineral elements most commonly deficient in the soil are nitrogen, phosphorus and potassium. These are known as 'critical elements'. The other essential elements are seldom lacking. Under certain circumstances when the soil is infertile the fertility of soil is restored by the addition of these elements as chemical fertilizers in the soil.