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Jeff - The primary use for No. 39 and other two-way plows is on in irrigated fields and they are usually found in the western part of the U.S. Using a two-way plow with proper methods won't leave dead furrows in the field, keeping the land in a more level condition. Therefore, fewer passes are required over the field to shape a smooth seedbed. A level seedbed is critical towards easier, more efficient management of the surface irrigation water, leading to increased crop yields. As with most other equipment, the No. 39 evolved with tractors and by the 1950s were equiped and sold new with rubber tires. The No. 39 plow was in IHs production line until the early 1960s. The obvious advantage of rubber tires is practical and legal movement of equipment down paved roads. Another advantage is machinery mounted on rubber takes less power to pull through the field due to less resistance, in comparison with steel wheels.
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