The correct option is D Complex fertilisers usually have a combination of nitrogen, phosphate, and potash.
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The fertiliser industry in India has expanded due to green revolution. The country does not have any reserves of commercially usable potash. A large chunk of potash is imported to our country. The main products of the fertiliser industries are nitrogenous fertilisers, phosphatic fertilisers, as well as Diammonium phosphate. Urea is one of the most important nitrogenous fertilisers.