It had sold 18,469 units in the same month last year, M&M said in a statement.
Domestic tractor sales last month stood at 16,379 units, as against 17,771 units in July 2013 - down 7.83%.
More From This Section
However, exports during the month increased 47.27% to 1,028 units as compared to 698 units in July last year.
M&M Chief Executive (Farm Equipment and Two Wheeler Division) Rajesh Jejurikar said: "A delay in the arrival of monsoon has led to late sowing and has impacted farmer sentiment leading to lower sales of tractors in July.
"We do hope that the rains picking up in the month of July across the country will give a boost to the farmers' morale and the agriculture industry alike.