

Fertiliser Technology - Engineering
Q1: Which one of the following is used as a nitrogenous fertiliser, as a weed killer in the onion fields and for correcting acidic soils ?A Urea
B CAN
C Ammonium sulphate
D Calcium cyanamide
ANS:D - Calcium cyanamide Calcium cyanamide, with the chemical formula CaCN2, is an inorganic compound that is primarily used as a nitrogen fertilizer. It is produced by reacting calcium carbide with nitrogen gas at high temperatures. The reaction proceeds as follows: CaC2+N2→CaCN2+CCaC2+N2→CaCN2+C Calcium cyanamide is a grayish-white solid that is soluble in water. It releases ammonia and calcium carbonate when hydrolyzed in water: CaCN2+3H2O→Ca(OH)2+2NH3CaCN2+3H2O→Ca(OH)2+2NH3 This hydrolysis reaction makes calcium cyanamide an effective nitrogen fertilizer because it provides a slow and steady release of ammonia, which serves as a nitrogen source for plants. Additionally, the hydrolysis reaction also results in the formation of calcium hydroxide (Ca(OH)2Ca(OH)2), which can help to neutralize soil acidity, making it useful for correcting acidic soils. Besides its role as a fertilizer, calcium cyanamide has other applications as well:
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