According to the South's Unification Ministry, if the shortage of rainfall lasts until early July, the North's crop production could decline by as much as 20 per cent from last year.
North Korea has suffered regular chronic food shortages - thousands are believed to have died during a famine in the mid- to late-1990's - with the situation exacerbated by floods, droughts and mismanagement.
UN figures show up to 70 per cent of the country remains food insecure and 28 per cent of children under the age of five are stunted.
Partial agricultural reforms have improved crop yields, and were cited in the ministry's report as the main reason food production slipped only 10,000 tonnes last year, to 4.8 million tonnes, despite a damaging spring drought.
Kim Jong-Un, who became leader after the death of his father, Kim Jong-II, in December 2011, allowed farmers to keep 30 percent of their production quota, plus any excess. This was later raised to 60 percent in the coming year according to the ministry.
But the prospects for this year are distinctly gloomy, given a prolonged drought and lack of fertilizer, the ministry said.
In May, precipitation across North Korea reached 56.7 percent of the average rainfall recorded between 1981 and 2010.
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