机械深施（二）化肥技术文／侯履谦，张培增，贺文胜二、化肥深施机械（一）机具型号意义农机具型号由类别代号、特征代号和主参数３部分组成，类别代号与主参数之间以短横线隔开。类别代号由分类号和组别号组成，分类号以数字表示（１表示耕耘和整地机械，２表示种植和施... Mechanical deep facilities (B) of fertilizer technology / Hou Lvqian, Zhang Peizeng, He Wensheng Second, fertilizer deep facilities machinery (A) Machine Type Significance Agricultural machinery model by the category code, feature code and the main parameters of three parts, Separated by dash. Category code is composed of classification number and group number, the classification number is expressed in numbers (1 means tilling and land preparation machinery, 2 means planting and applying ...