What is algal fertilizer?How does it help in agriculture?

In Simple words,
Blue-green algae can be helpful in agriculture as they have the capability to fix atmospheric nitrogen to soil. This nitrogen is helpful to the crops.
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Fertilizer?Production Routes. The Haber-Bosch process converts natural gas and nitrogen from into ammonia to produce urea and commercial?fertilizers. Phosphate rock is converted to usable phosphates.?Fertilizers are?substances added to soil to improve its fertility, and thus, the growth and yield of plants.
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