Harrows are a type of agricultural machinery that has been used since the Middle Ages. Disc harrows are indispensable when it comes to cultivating the soil before crops are planted. The main advantage is that they can chop up soil that has been recently plowed and thus eliminate clumps or simply loosen the soil if it has been packed. In the past, they were horse-drawn, but today they are usually towed after the tractor. Apart from disc type, there are also tine, chain, and spike harrows. Disc harrows are designed to be used for heavy work. As the name suggests, they consist of many iron or steel discs attached to a frame. Usually they are arranged into two to four sections.
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