Corn.

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Presentation transcript:

Corn

Objectives 1 Identify the types of corn and their uses. 2 Identify and describe the parts of a mature corn plant. 3 Identify the leading states and nations in corn production, and determine the major export markets for the United States.

What are the types of corn, and what are their uses? Corn is one of the most valuable cereal grain (a seed of the cereal grain plant) crops grown in the United States and the world.

Corn Types Characteristics Amount Quality Arrangement

6 Most Common Types dent corn flint corn Floury corn Popcorn sweet corn pod corn.

Dent Corn Zea mays indentata Most common type of corn grown in the US It is referred to as field corn. The crowns of the kernel are dented, giving the corn its name. This denting occurs when the starch at the end of the crown shrinks during drying. Dent corn can be yellow, white, or red. The length of the growing period varies by cultivar.

Flint Corn Zea mays indurata is a popular source of corn meal mature fairly quickly, even under poor conditions. Flint corn is resistant to many insects and can be shipped overseas because of its kernel hardness The center is composed of only a small amount of soft starch surrounded by a thick layer of hard starch. Flint corn comes in many colors, including white, yellow, red, and blue.

Floury Corn Zea mays amylacea is also called soft corn The kernels of soft corn are composed primarily of soft starch with a thin covering of hard starch. The lack of a thick, hard starch layer makes this corn type a good choice for flour production. Floury corn comes in several colors, including white and blue.

Popcorn Zea mays everta Cultivars are divided into two classes: pearl and rice. This division is based on the shape of the kernel. Popcorn kernels are smaller than flint corn kernels and are composed of a hard, flinty starch. Some cultivars have a soft starchy center. The kernels are usually white or yellow, but they may be red, blue, or brown. When popcorn is “popped,” the moisture inside the kernel is heated until it becomes steam. This causes pressure that causes the kernel to explode. The white or yellow flaky material is the starch from inside of the kernel.

Sweet Corn Zea mays saccharata is most commonly grown for human consumption Sweet corn is picked while still immature to retain the high sugar content. Sweet corn kernels are white or yellow and may be wrinkled or become caramelized in color when fully mature.

Pod Corn Zea mays tunicata has little commercial importance and is commonly grown as a specialty item. Pod corn kernels are enclosed in a husk or pod, and the ear is surrounded by a large husk.

3 Major Places Corn Goes Livestock Ethanol High Fructose Corn Syrup

What are the parts of a mature corn plant? Corn plants are supported by a stem or stalk. Leaves Alternating along the stem at intervals of approximately 8 to 12 inches long narrow leaves with parallel venation. Depending on the variety, the leaves measure from 2- to 4- feet long and 2- to 4-inches wide.

What are the parts of a mature corn plant? Roots Corn plants have fibrous root systems are supported by smaller roots called prop roots which are above-ground roots that aid in keeping plants erect. Reproduction- monoecious Has male and female parts on the same plant and reproduces itself The reproductive structures of a corn plant are the “ear” and “tassel.”

Monoecious

Breaking Down the Kernel

What is Corn’s History? Corn was domesticated in Mexico around 9000 B.C. Native America’s introduced to Settlers

What are the leading States in Corn Production? Iowa (2) Illinois (3) Nebraska (4) Minnesota (5) Indiana.

Worldwide Corn Production Markets US (38 percent) China (21 percent) Europe (8 percent) Brazil (7 percent). Markets Japan (29 percent) Mexico (17 percent) Taiwan (8 percent) South Korea (8 percent)

Integrated pest management (IPM) a pest management strategy that uses a combination of measures to reduce pest damage with the least disruption to the environment. Common corn pests include weeds, insects, nematodes, and diseases. Besides IPM, planting resistant varieties can help reduce pest and disease problems.

Harvest Corn can be harvested with a picker or combine. Corn harvesting should be timed for maximum yield. Grain corn should be harvested at 20 percent to 28 percent moisture. Higher moisture corn requires increased artificial drying. Corn should be dried to approximately 15.5 percent. However, corn in more humid area may need to be dried to 11 percent. The increased drying should help avoid aflatoxin buildup.

Aflatoxin An aflatoxin is a highly poisonous substance caused by the fungi Aspergillus florus in grain. Aflatoxins in animal feed can be deadly.