But the farm ministry hopes that the prices of onions - a staple for most Indians - will drop to the usual levels once winter harvests kick in.
The ministry said that abnormal price hike was an effect of last year's patchy monsoon.
Dikshit urged agriculture minister Sharad Pawar to ban exports, but ministry officials said they would try out other basic measures first.
At an inter-ministerial meet, officials suggested setting of a minimum price below which traders won't be allowed to export onions, which would make Indian onions expensive for foreign buyers and cheaper at home.
BJP spokesperson Prakash Javadekar, however, slammed the government, saying too much time was being lost in watching the situation.
Onion stocks usually bottom out during this time of the year, a seasonal phase when summer harvests are nearly exhausted and winter harvests not fully ready. But this year, there are signs of a major shortfall from last year's partial drought.
The National Council of Applied Economic Research has forecast a 20% dip in onion output for 2012-13.
If shortages worsen, the government could order imports, Pakistan being India's swiftest and cheapest option.