Table 5. List of  commonly used fertilizers for culture of catla and their N:P ratio, calcium and NPK content
Type of fertilizers		Chemical formula	N:P ratio and Ca and NPK content (%)
			N:P ratio	Calcium	Nitrogen	Phosphorus	Potassium
Organic manures
Faeces/dung	Cattle		3.75		0.6	0.16	0.45
	Sheep		2.71		0.95	0.35	1
	Pig		1.33		0.6	0.45	0.5
	Poultry manure		1.5		3	2	2
	Duck manure		0.71		1	1.4	0.62
Meals	Bone meal*		0.17		3.5	21
Deoiled cakes	Mustard*		2.82		4.65	1.65	1.56
	Groundnut*�		4.76		7.29	1.53	1.33
	Mahua		3.14		2.51	0.8	1.85
	Neem		4.83		5.22	1.08	1.48
	Coconut*		1.59		3.02	1.9	1.77
Aquatic plants and algae
	Water hyacinth		5.51		2.04	0.37	3.40
	Azolla sp.		18.4		3.68	0.2	0.15
	Lemna sp.		16.55		3.31	0.2	0.69
	Ceratophylum sp.		7.02		3.3	0.47	5.90
	Hydrilla sp.		9.64		2.7	0.28	2.90
Others	Compost		1.33		0.4 - 0.8	0.3 - 0.6	0.7 - 1.0
	Green manure		3.5 - 5.0		0.5 - 0.7�	0.1 - 0.2	0.4 - 0.8
Inorganic fertilizers
Calcareous	Limestone	CaCO3		40
	Quicklime	CaO		71.5
Nitrogenous	Ammonium sulphate	(NH4)2SO4			21.2
	Ammonium nitrate	NH4NO3			35
	Urea	CO(NH2)2			46.7
Potassium	Potassium chloride	KCl					52.4
	Potassium sulphate	K2SO4					44.9
Phosphate	Single super phosphate	Ca(H2PO4)2+CaSO4				7�8.7
	Triple super phosphate	Ca(H2PO4)2				19.2�23.6
*Often used as feed ingredients
Data source: Jhingran (1991); CIFRI (1985b); www.fao.org/docrep/003/T0555E/T0555E