Table 6. List of commonly used inorganic fertilizers used for carp (rohu) culture and their chemical composition
Type of fertilizer			Nitrogen	Phosphorus	Potassium
NITROGEN FERTILIZERS
	Urea		46
	Ammonium sulphate		20.6
	Ammonium nitrate		33.5
	Ammonium phosphate, 20/20		16	20
	Ammonium phosphate, 22/49		18	49
	Sodium nitrate		15.5
	Calcium nitrate		15.5
PHOSPHATE FERTILIZERS
	Superphosphate
		Single		18
		Double		40
		Triple		45
	Di-calcium phosphate			29.5
	Rock phosphate			35
	Bone meal		3.5	21
POTASH FERTILIZERS
	Potassium sulphate				48
	Potassium chloride (muriate)				50
	Potassium nitrate		13.8		38.7
Source: Adapted from Tacon (1987); Jhingran (1991).