Soldiers suffering from radiation sickness are also flooding the country's hospitals after the test, according to reports.
The government instructed farmers affected to harvest crops rather than repair damage caused, according to a source.
"Farmers couldn't even think of repairing the damage because they're busy harvesting crops even though three months have passed since their houses were destroyed," the source said.
"Displaced farmers are staying in temporary shelters or living with neighbours whose houses sustained less damage."
Kim is preparing to attach miniature nuclear warheads to rockets that could reach US mainland within weeks, experts have claimed.
The one-party state is thought to be close to being recognised as a nuclear power despite researchers finding it conducted fewer missile tests in this year's final quarter.
But the rapidly increasing strength of North Korea's nuclear tests could mean its programme develops without detonations, according to Tetsuo Sawada, who is an assistant professor at Tokyo Institute of Technology.
Sawada says the country has reached new heights of nuclear technology which will allow it to develop weapons without tests.
He told Russian news agency TASS earlier this month: "North Korea is constantly upgrading its technology and has now reached a level where, in my estimation, it no longer needs to carry out nuclear detonations to test and develop the relevant weapons.
"Of course, this is my assumption, but it is based on the analysis of six tests conducted in that country.
"I believe the last test, the sixth one, was particularly successful. Authoritative experts estimate its power at 250 kilotonnes of TNT equivalent."
