The second wave, about 2000 years ago, through the lowlands of South America.

Evidence of cultivation in Peru has been found dating to about 6700 years ago. ДЄccording to a genetic study by Embrapa, corn cultivation was introduced in South America from Mexico, in two great waves: the first, more than 6000 years ago, spread through the Andes. Since then, even earlier dates have been published. Dolores Piperno, The Origins of Plant Cultivation and Domestication in the New World Tropics: Patterns, Process, and New Developments ДЄrchaeologist Dolores Piperno has said: ДЄ large corpus of data indicates that was dispersed into lower Central America by 7600 BP and had moved into the inter-Andean valleys of Colombia between 70 BP. This is consistent with a model based on the archaeological record suggesting that maize diversified in the highlands of Mexico before spreading to the lowlands. Later, maize spread from this region over the Americas along two major paths. The study also demonstrated that the oldest surviving maize types are those of the Mexican highlands. has demonstrated that, rather than the multiple independent domestications model, all maize arose from a single domestication in southern Mexico about 9,000 years ago. ДЄn influential 2002 study by Matsuoka et al. Recent research in the early 21st century has modified this view somewhat scholars now indicate the adjacent Balsas River Valley of south-central Mexico as the center of domestication. Most historians believe maize was domesticated in the TehuacГЎn Valley of Mexico. Genetic evidence can also be used to determine when various lineages split. Whether or not the kernels fall off the cob on their own is a key piece of evidence used in archaeology to distinguish domesticated maize from its naturally-propagating teosinte ancestor. Maize is a cultigen human intervention is required for it to propagate. ДЄncient Mesoamerican relief, National Museum of Anthropology of Mexico. Subsidies in the United States help to account for its high level of cultivation of maize and its position as the largest producer in the world. Genetically modified maize made up 85% of the maize planted in the United States in 2009. Maize is the most widely grown grain crop throughout the Americas, with 361 million metric tons grown in the United States alone in 2014. In 2014, total world production was 1.04 billion tonnes. Maize is widely cultivated throughout the world, and a greater weight of maize is produced each year than any other grain. Maize is also used in making ethanol and other biofuels. Sugar-rich varieties called sweet corn are usually grown for human consumption as kernels, while field corn varieties are used for animal feed, various corn-based human food uses (including grinding into cornmeal or masa, pressing into corn oil, and fermentation and distillation into alcoholic beverages like bourbon whiskey), and as chemical feedstocks. The six major types of maize are dent corn, flint corn, pod corn, popcorn, flour corn, and sweet corn. In addition to being consumed directly by humans (often in the form of masa), maize is also used for corn ethanol, animal feed and other maize products, such as corn starch and corn syrup. Maize has become a staple food in many parts of the world, with the total production of maize surpassing that of wheat or rice.

The leafy stalk of the plant produces pollen inflorescences and separate ovuliferous inflorescences called ears that yield kernels or seeds, which are fruits. mays, from Spanish: maГz after Taino: mahiz), also known as corn ( North American and Australian English), is a cereal grain first domesticated by indigenous peoples in southern Mexico about 10,000 years ago.

Indian corn