Sweet corn

cultivated subsethem in the Genus Gramineae corn, a year-round herb made from sweet proton grains from unripe fruit spikes. The name Zea mays L.var. Rugosa Bonaf, alias corn. Chromosome number 2n-2x-20. Rich in soluble carbon water
compounds
(dedexion), fat and
protein
, rich in
vitamins
A, less powdered starch content. In addition to cooking, can be made into cans.Tropical regions native to Africa, in southern Mexico archaeological discovery of corn spike shaft, from 5400-7200 years ago, fossil pollen particles have been identified for about 80,000 years, but not until the 18th century was found and valued, China was introduced from the United States in the mid-1940s, mainly in Europe, the Americas and the Soviet Union, China only in a few cities near small cultivation.plant is more than 2.5m high, and the base stem is strong. The root system, powerful, can go deep into the soil about 2.5m, expand the diameter of about 2m. The base stem is prone to variable roots and constitutes the main absorption system. The above-ground stems are also prone to gas rooting. Male and female are the same flower, male flower sequence from the top of the stem shaft, in order to disperse the conical flower sequence, male flowers generally open ten days before the female flower, spread pollen, by wind spread. The female flower sequence (fruit spike) is born between the leaves, which is the meat spike flower sequence. On it is a row of children's rooms, each room has a slender long flower wire (pillar head), flower sequence wrapped in green leaves, the top leaves grow.corn is warm and frost-fearing. The reproductive process distributes germination, seedling, tying and flowering. The germination temperature is 21-27 degrees C, the growth temperature is 21-30 degrees C, and the growth can still be made below 16 degrees C or above 35 degrees C. Short-day plants are sensitive to light cycles. Tropical varieties moved to temperage cultivation can not flower, if the daily length dropped to 12-14 hours can also spike, but the nutritional growth is strong, plants up to about 6m, so the introduction of cultivation must pay attention to the selection of suitable varieties. Very short days (8 hours) and low temperatures can delay flowering. Only very precocious tropical species can blossom normally in temper zones, but the yield of plants is very low. Sweet corn has higher requirements for fat water, and is generally planted on fertile vegetable land with irrigation conditions. Before planting, it is best tothe sun, carefully round the ground, to make a tall, thick layer of farming and help with drainage. To fertilize, strip or hole. Sweet corn can be broadcast live and planted. Before the final frost, the soil moisture is stable at more than 13 degrees C when sowing, seedlings can be early in the protection of the use of nutrients to cultivate strong, after the frost, can be harvested 10-15 days earlier. If the supply period is extended, it can be sown in stages. 30 to 45cm × 30 cm, 3-4 seeds per hole. In the spring drought, water can be watered in the cave before planting, covered with fine dry soil and crushed fertilizer each 5cm. After the seedlings are out, check the seedlings early to make up the seedlings. When the seedling is 15cm high, the seedlings are carried out, leaving 2 strong seedlings per cave. When pests are rampant, the number of seedlings may be delayed or increased. Four-leaf period seedlings, to pursue fertilizer in the cultivation, to promote its hair a pregnant spike. After several times to cultivate weeds, combined with soil to chase the fertilization and spike fertilizer. Timely dredging of weak divisions. Corn grains by hand to see when there is milk or when the flower silk,shell tight, fruit spike hand holding solid for the harvesting period. Harvesting should take place in the early morning when it is cold. The spike can be stored for about 5 days at 16 degrees C and only 1-2 days at 29 degrees C. In order to maintain the fruit spike for a long time high-quality, after receiving can be first impregnated in 10 degrees C water, and then cooled to 0 degrees C, to slow down the sugar
cation
as the rate of starch, at 10 degrees C temperature can be stored for about 7 days.the seedlings have ground tigers and crickets as harmful roots, can be used to prevent and control poisonous soil. During the pregnancy and knotted period, cornworm larvae are harmful to the heart leaves, stems, flowers, fruit spikes and sub-grains, which seriously affect the yield quality. It was better to directly cast 1.5% zinc parathion granules into the heart leaves about a week before the spike. Kunming area corn silk black spike disease is serious, in addition to rotation and soil disinfection, can spray multiple amounts of Bordeaux liquid prevention and control.