Simulation and Establishment of Dentcorn·Sorghum-Rye·Barley Double Cropping System by Combined Seeder

1. A prototype combined seeder comprised of a forage harvester, a rotary tiller, a fertilizer and a seeder for dentcorn·sorghum-barley·rye double cropping systems was developed. The working hour of combined seeder for dentcorn harvesting and rye seeding work in test field (30a) was 12.2a/h.2. Using the combined seeder, dentcorn-rye cropping system and sorghum-barley cropping system showed maximum average yields of 2.7t/10a (DM). The forage crops were improved in qualities as silage materials because of longer culture periods by the combined seeder.3. The simulation results of 11 years (1985-1995) using precipitation data of Morioka in field area of 5ha show that the combined seeder with the work efficiency 12a/h completed 5ha of dentcorn·sorghum-rye·barley cropping systems same as forage-harvester with the work efficiency of 24a/h did. And the combined seeder will finish rye or barley seeding work earlier than individual harvesting and seeding works do. The combined seeder shows merits of efficient works and better forage crop qualities in northern Tohoku Area.