Which one of the following is not a nitrogenous fertilizer?

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Q: 46 (NDA-II/2008)

Which one of the following is not a nitrogenous fertilizer?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,10,29,10,9,8,12

keywords: 

{'nitrogenous fertilizer': [0, 0, 1, 0], 'cacn2': [0, 0, 1, 0], 'nh4no': [0, 0, 1, 0], 'urea': [5, 1, 4, 10]}