After the mishap, the angry locals torched the truck and blocked the national highway for two hours, the eyewitnesses said.
While six persons were killed on the spot, one died later. The injured have been admitted to a hospital, said Additional Superintendent of Police (West) Dinesh Kaushal.
Kaushal said the police doused the fire before the truck was totally burnt.
The eye-witnesses added the irate locals also blocked the nearby Agra-Mumbai Highway. They claimed it took a lot of time for the ambulance to reach the mishap site.
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They said as per the initial probe the truck's driver lost control over the vehicle following which it collided head-on with the tractor-trolley.
The deceased were identified as Asha Ram, his wife Sunita, Ballu, Veer Singh, Rajendra, Chhote and Satish, they added.
District Collector Rahul Jain visited the hospital to meet the injured and ensure proper treatment for them.
He said Madhya Pradesh Chief Minister Shivraj Singh Chouhan was informed about the accident.