| A 2BZ-4 planter with whole plastic-film mulching on double ridges was designed by the author and his team to meet the requirement of whole film double furrow sowing on the dry land in Northwest China and the local agronomic characteristics.The planter was mainly used for self-propelled sowing operations after film-covering and ridge-forming.The machine had an advantage of complete varieties of crops multi-purpose planting by selecting different seeders over the existing planters in the market. At the beginning of the design, the factors, different regions and different crops’ agronomic requirements were considered. The sowing depth, automobile chassis wheel track and row spacing could be adjusted in 40~100 mm,1 000~1 400 mm and 380~550 mm, respectively. The design not only greatly improved the universality of the planter, but also reduced labor intensity and improved seeding efficiency obviously. |