The exchanges logged a business of Rs 50.29 lakh crore in the same period last year.
Much of the fall in futures trade volumes was witnessed in bullion, followed by energy, metals and farm items, as per the data released by the commodity markets regulator FMC.
According to FMC data, the turnover from bullion fell by 69 per cent to Rs 7.18 lakh crore in April-July of this fiscal from Rs 22.93 lakh crore a year ago.
The turnover from agricultural commodities declined by 15 per cent to Rs 4.15 lakh crore in the April-July period of this financial year from Rs 4.89 lakh crore a year ago.
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Experts said the fall in business at most of the exchanges' platform was due to imposition of commodity transaction tax since last year.
The dent in investor sentiment after the Rs 5,600 crore payment scam surfaced at spot exchange NSEL also weighed, they added.