In this monograph, the design of a cellular mechanical sowing machine for sowing onion seeds in rows was developed, and the placement of onion seeds on the cellular disk of a mechanical sowing machine was determined taking into account its geometric dimensions and centre of gravity. the essence of the process is explained and based on the installation height of the mechanical sowing apparatus, the optimal parameters of the working parts of the mechanical sowing apparatus are illuminated by the condition of sowing onion seeds at the same interval with high precision. The obtained results were obtained on the basis of scientific research conducted using modern methods and measuring instruments, the mutual adequacy of theoretical and experimental research, the positive results of tests of the device for sowing onion seeds. The monograph is intended for researchers, researchers, graduate students and students.Reviewers:D.A. Koldashev - Ph.D., associate professor.N.S. Turaev - Ph.D.The monograph was published by the decision of the Scientific Council of NamMQI No. 13 of 30.05.2023.