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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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