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We established a new system of fertilizing-seeding and subsequent management of carrot cultivation, which is labor-saving, low cost and adaptable to large scale field farming management in Hokkaido.The results obtained are as follows:1. The system developed can be used for three processes; 1) fertilizing-seeding, 2) weeding, and 3) split dressing and molding on carrot cultivation. With this system, traditional 8 processes (total operation time: 181.1h/ha) was decreased to 3 processes (7.4h/ha). Fertilizing and seeding carrot was done by the newly developed trial machine.2. The trial machine for fertilizing and seeding is adaptable to 4-row cultivation with the row width of 65cm and the tractor which power is 60 PS or more is required for pulling this machine. By using this machine, traditional 4-process management is decreased to one process and the seeding performance is 3-4ha per day. The belt-type device which intrarow spacing is 5cm (2 rows at 10cm in width) was the most adequate as a seed metering device. By using this device with control plate of fertilizing band, fertilizer can be applied zonally. The 95% of fertilizers could be applied to the soil within 20cm in width, 15-20cm in depth. Therefore, remarkable fertilizer saving can be expected, compared to the traditional system.3. The same machines which are commonly used in main crop farm are available to spraying of agricultural chemicals and split dressing and molding.4. The level of growth and yield of carrot in the new system is equal to or more than the level of traditional system.

Studies on the Establishment of Field "Farming-Type System" in Fertilizing-Seeding and Management of Carrot cultivation.