The nutrient recommendation for Colocasia is 80:25:100 kg NPK/ha. The quantity of straight fertilizers to get the above dose is worked out for a cent.
The fertilizers dose needed is 694 gram urea, 555 gram rock phosphate and 668 gram Muriate of Potash respectively for a cent. The fertilizers have to be applied in split doses.
The first split has to be applied in one week after sprouting. The urea, rock phosphate, Muriate of Potash needed at this time is 347 gram, 555 gram, 334 gram respectively for a cent.
The second dose has to apply in one month after first application and the dosage is 347 gram urea, 334 gram Muriate of Potash respectively for a cent.
Lime or dolomite @ 1-3 kg per cent has to be applied in acid soils two weeks ahead of fertilizer application. Organic manure @ 48 kg/cent is recommended at planting time.
To get the details for an acre you need to multiply the values with 100.