I don't know that they disappeared in favor of the moldboard. They were used mostly in the south. They work better in drier soils. I grew up in south Texas. Warm temperatures even in the winter. In Kansas and in the midwest, winters are cold, the soil dries out slowly. You can use a moldboard long before you can use a disk plow. Disk plows don't scour as well as moldboards. Although the disk plows can be equipped with scrapers, in my opinion if you need scrapers it's too wet anyway. I would "guess" that a disk plow could be used in cooler climates in the fall when the soil is likely to be drier, but you would have to wait a long time in the spring, before the soil dried out, likley never because of the spring rainfall pattern. On the other hand, in our soils, a week or so after a rain we could use a disk plow in the early summer when we did most of out plowing.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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