The eight core industries -- fertilisers, cement, steel, electricity, crude oil, coal, petroleum refinery products and natural gas -- have a combined weight of about 38 per cent in the Index of Industrial Production.
For 2013-14, core sector growth slowed to 2.6 per cent from 6.5 per cent in 2012-13, according to data released by the Ministry of Commerce and Industry.
In March, crude oil, natural gas and fertiliser output fell 1.6 per cent, 9.3 per cent and 6.1 per cent, respectively.
Growth in the production of coal, petroleum refinery products and steel slowed to 0.7 per cent, 2.8 per cent and 5.4 per cent in March as against 1.7 per cent, 24.3 per cent and 11.6 per cent a year earlier, respectively.
Cement output was unchanged in March. Only electricity generation increased to 5.4 per cent from 3.5 per cent in March 2013.
In January and February, the eight sectors grew by 1.6 per cent and 4.5 per cent, respectively.
Infrastructure output growth slows to 2.5 pct in March
(Reuters) India's annual infrastructure sector output growth slowed to 2.5 percent in March, dragged down mainly by a contraction in production of crude oil, natural gas and fertilizers, government data showed on Wednesday.
The sector grew an annual 4.5 percent in February.
In the fiscal year that ended in March, the output grew an annual 2.6 percent compared with a 6.5 percent growth a year ago, the data showed.
The infrastructure sector, which comprises coal, crude oil, oil refining, natural gas, steel, cement, electricity and fertilisers, accounts for 37.9 percent of India's industrial output.