Question

Which of the nitrogen fertilizer can meet the needs for immediate requirement of the crop?
A. Potassium nitrate
B. Superphosphate of lime
C. Calcium cyanamide
D. CAN

Answer 1

Hint: The crops need nitrogen to synthesize the amino acids themselves. Because amino acids are the building blocks of the proteins. The nitrogen gas which is present in the atmosphere is going to be utilized by the plants, so plants need nitrogen in the form of fertilizer.

Complete answer:
- In the question it is asked to find which of the nitrogen fertilizer can meet the needs for immediate requirement of the crop among the given options.
- Generally, crops absorb nitrogen in the form of nitrate because crops cannot digest the atmospheric nitrogen due to the presence of the triple bond in the atmospheric nitrogen.
- So, we have to provide the nitrogen source in the form of dissolved fertilizer.
- Means we need a nitrogen fertilizer that is supposed to be soluble very easily in water.
- Nitrate form of fertilizer is more soluble in water than the other forms of the fertilizer.
- Among the given options potassium nitrate is the fertilizer which is highly soluble in water.
- Therefore, potassium nitrate is a nitrogen fertilizer that can meet the needs of the immediate requirement to the crops.

So, the correct option is A.

Note:
All crops need the nitrogen to prepare their own amino acids. Potassium nitrate is the immediate nitrogen source to fulfil the requirements of the crops. Without nitrogen the growth of the crops is going to stop.