六十年代以前,我国茶园垦殖基本依靠人力。随着茶叶生产的迅速发展,六十年代中期试用n-5-25型机引犁改装成单铧,用东方红-54型拖拉机牵引进行茶园开垦作业,来回犁耕两次的红壤地沟,深度可达25～27厘米,台班工效为25亩左右(栽植行距1.5米,株距45厘米)。1965年,广东省农垦厅机械研究所将n-5-25型机引犁的犁体改制成双壁犁体,同样用东方红-54型拖拉机来回犁耕两次,沟深可达32～35厘米,熟地红壤耕深达38厘米,基本克服了n-5-25型单壁犁作业时因犁体承受过大的侧压力而引起的直梁和加强梁翘曲、尾轮机构过早损坏等不良后果。 1973年具有液压悬挂装置的东方红-75型履带 Before the sixties, our cultivation of tea plantations basically relied on manpower. With the rapid development of tea production, the mid-1960s trial n-5-25-type plow converted into a single share, the East Red -54 type tractor traction for tea cultivation operations, plow twice back and forth red soil trench depth Reaches 25 ~ 27 centimeters, Taiwan work efficiency is about 25 acres (planting spacing 1.5 meters, spacing 45 cm). In 1965, Guangdong Provincial Bureau of Land Reclamation Machinery Institute n-5-25 plow plow body converted into double-wall plow body, the same with the East Red -54 tractor back and forth plow twice, the furrow depth of up to 32 ~ 35 cm, Rehmannia glutinosa red soil cultivation depth of 38 cm, basically overcame the n-5-25-type single-wall plow operation due to the plow body to withstand excessive lateral pressure caused by the straight beam and stiffening beam warp, tail wheel mechanism premature Damage and other adverse consequences. 1973 with hydraulic suspension Dongfanghong -75 type track