Question:
The quantity of atmospheric nitrogen fixed by Casuarina equisetifolia is ______________.
The quantity of atmospheric nitrogen fixed by Casuarina equisetifolia is ______________.
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Unlike legumes (Rhizobium), Casuarina fixes nitrogen via Frankia. Its fixation rate is comparable to many leguminous trees.
Updated On: Aug 20, 2026
- 300-350 kg N ha$^{-1}$ yr$^{-1}$
- 60-110 kg N ha$^{-1}$ yr$^{-1}$
- 200-250 kg N ha$^{-1}$ yr$^{-1}$
- 600-650 kg N ha$^{-1}$ yr$^{-1}$
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
Casuarina equisetifolia is a non-leguminous nitrogen-fixing tree that forms a symbiotic relationship with the actinomycete Frankia.
Step 2: Detailed Explanation:
• Casuarina is extensively planted in coastal regions for windbreaks and fuel. Its ability to fix nitrogen allows it to thrive in nutrient-poor sandy soils.
• Various studies have estimated the amount of atmospheric nitrogen it can fix through its root nodules.
• On average, a healthy plantation of Casuarina equisetifolia can fix between 60 to 110 kg of Nitrogen per hectare per year.
• This nitrogen fixation contributes significantly to the soil fertility of the surrounding area, making it a valuable component in agroforestry.
Step 3: Final Answer:
The quantity fixed is 60-110 kg N ha$^{-1}$ yr$^{-1}$.
Casuarina equisetifolia is a non-leguminous nitrogen-fixing tree that forms a symbiotic relationship with the actinomycete Frankia.
Step 2: Detailed Explanation:
• Casuarina is extensively planted in coastal regions for windbreaks and fuel. Its ability to fix nitrogen allows it to thrive in nutrient-poor sandy soils.
• Various studies have estimated the amount of atmospheric nitrogen it can fix through its root nodules.
• On average, a healthy plantation of Casuarina equisetifolia can fix between 60 to 110 kg of Nitrogen per hectare per year.
• This nitrogen fixation contributes significantly to the soil fertility of the surrounding area, making it a valuable component in agroforestry.
Step 3: Final Answer:
The quantity fixed is 60-110 kg N ha$^{-1}$ yr$^{-1}$.
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