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Tillage

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Tillage is the mechanical preparation of soil through various methods of agitation. This process includes digging, stirring, and overturning the earth to prepare it for crops. Farmers use tillage to loosen the soil and incorporate fertilizers or organic plant material. This process helps create a healthy environment for seeds to grow. Tillage is also used to manage weeds that might compete with crops for sunlight and water.

There are two main stages of tillage: primary and secondary. Primary tillage is the first, deeper step performed after a harvest. It aims to reach a reasonable depth to soften the soil and aerate it. This step usually leaves the surface with a rough texture. Secondary tillage follows to create a smoother surface finish. This process produces a finer soil called tilth, which is necessary for a good seedbed. Some tools, like harrows or rototillers, can combine both stages into one single operation.

Farmers use many different tools to achieve these results. Human-powered methods include using shovels, hoes, or rakes. For larger work, people use draft animals or machines. Mechanized tools include ploughs, which overturn soil with moldboards, and cultivators with teeth called shanks. Specialized equipment like the Petty Plough, developed by Frank and Herbert Petty in the 1930s, can be steered. This allows operators to plough specifically between orchard trees or in the center of rows.

Arròs, sequer (26462086444)
Arròs, sequer (26462086444)

History shows that tillage has changed significantly over thousands of years. The earliest evidence of plow usage dates back to 4000 BCE in Mesopotamia. Early farmers used human labor or animals like oxen and water buffalo. In 1731, Jethro Tull published "Horse-Hoeing Husbandry." He argued that soil must be pulverized into fine powder to feed plants. Later, the invention of the steel plow allowed farming in the rocky American Midwest. By 1900, the introduction of the farm tractor made large-scale agriculture possible.

While tillage helps crops, it can also cause environmental challenges. Intensive tillage leaves less than 15% crop residue on the soil. This can lead to soil compaction, known as a tillage pan, and increased erosion. In the 1930s, excessive tillage in the American Midwest contributed to the Dust Bowl. During this time, topsoil was blown away in massive dust storms. In 2019, it was estimated that 3 trillion pounds of soil were lost to erosion in the United States. This has led scientists and farmers to rethink how they manage the land.

To protect the earth, many farmers now use conservation tillage. This method leaves at least 30% of crop residue on the surface. This residue slows water movement and reduces soil erosion. It also helps beneficial predatory arthropods, which provide natural pest control. Conservation tillage can also save farmers money by reducing fuel consumption. It is used on over 370 million acres across South America, Oceania, and North America. However, it can also delay the warming of the soil in the spring.

Other modern methods include no-till and zone tillage. No-till farming avoids plows entirely to maintain 100% ground cover. Zone tillage is a modified deep tillage that only disrupts narrow strips of soil. These strips are usually about five inches wide, located directly below the crop row. This method helps break up plow pans and improves soil drainage. In the United States, zone tillage is used on more than 36% of farmland. It is common in states like Pennsylvania, Illinois, and Wisconsin.

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Tilling with Hungarian Grey cattles.tif
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Arròs,_sequer_(26462086444).jpg
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2DU Kenya115 (5366706027).jpg
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