cultivo migratorio

cultivo migratorio

A farming system, common in the tropics, in which land is cleared, the debris burned, and crops grown for a relatively short period until yields decline. The land is then abandoned. The original land is cleared and cropped again after a uncontrolled fallow period of 3-20 years, usually when soil fertility has been naturally restored by woody vegetation.

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Kategorie Allgemeine Landwirtschaft
Company: USDA
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migratorio

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Wandering.

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The technique of weeding and hoeing for the purpose of increasing the air in the to layers of the soil and to break up the soil so water will penetrate.

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Antigens on surfaces of cells, including infectious or foreign cells or viruses. They are usually protein-containing groups on cell membranes or walls.

antígenos de neoplasias

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Proteins, glycoprotein, or lipoprotein moieties on surfaces of tumor cells that are usually identified by monoclonal antibodies. Many of these are of either embryonic or viral ...

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antígeno nuclear de célula proliferativa

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