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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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