Corn is an important food crop in the world

Solution (1) "In agricultural production, corn seeds with full grains are often used for sowing", because the nutrients stored in the endosperm of seeds [ ] can "ensure the normal germination of seeds" The characteristic of starch is that it turns blue when encountering iodine solution, so it turns blue after adding iodine (or iodine solution) on the longitudinal profile of corn seeds, indicating that the main component of endosperm is starch

2) "Farmers often sow seeds after rain or after soaking the seeds sufficiently", which indicates that the germination of corn seeds requires a certain amount of water; At the time of germination, the first to break through the seed coat is the [ ] radicle in the carb

3) Weeds compete with seedlings in the field for sunlight, water and nutrients, and the two are competitive

4) After pollination and fertilization are completed, all parts of the flower have changed, the corolla, calyx, stamens, stigma and columella have all withered, only the ovary continues to develop into fruit, and the ovules inside develop into seeds If there is continuous rainy weather, the pollen on the male inflorescence of corn is sticky and cannot be pollinated smoothly, so it affects fertilization, and it cannot bear fruit, resulting in reduced yield It can be compensated by artificial pollination The stamens of the corn are covered with a paper bag, and the corn stalk is gently shaken to scatter the pollen into the bag; It is then poured over the pistil, and pollination is done by hand

So the answer is: 1) endosperm; The longitudinal section of corn seeds turns blue after adding iodine (or iodine solution), indicating that the main component of endosperm is starch;

2) a certain amount of moisture; Radicle;

3) competition; 4) ovary; Pollination; Stamen; Pistil

Corn is native to Peru in South America and has been cultivated by local Indians for more than 7,000 years. After Columbus discovered the New World in 1492, the Spaniards brought back corn from the Americas, calling it the Indian seed, which soon spread around the world. Corn was introduced to China around the beginning of the 16th century.

1. Corn is an important cereal crop in China, and its total output ranks second only to rice in recent years. Statistics over the past 50 years show that maize has become increasingly important in agricultural production. In recent years, corn has developed into an important grain, feed and industrial raw material crop in China.

The scale of development of corn production has become an important factor affecting the situation of grain supply and demand in China and determining the development of animal husbandry and corn processing industry.

2. Corn has the characteristics of high and stable yield, strong stress resistance and wide adaptability; Corn can be intercropped, intercropped and mixed with beans, wheat, potatoes and other crops, which can increase the multiple cropping index and improve the land utilization rate, which is of great significance to increasing grain production.

3. Corn is recognized as the king of feed. The grains and stems and leaves of corn are high-quality feed. In the 90s of the 20th century, about 70 million 75 million tons of corn were used as feed in China every year.

At present, the average annual consumption of feed corn is more than 80 million tons. With the great development of animal husbandry, corn for feed will increase greatly, and the position of corn in animal husbandry will become increasingly prominent.

4. Corn kernels are rich in nutrients, so they have good edible value. With the improvement of living standards, some processed foods with corn as the main ingredient are emerging. There are mainly corn puffed foods and gelatinized foods

Puffed porridge, puffed noodle tea, puffed crispy strips, corn flakes, noodles, biscuits, bread and so on. It can also be made into corn rib soup, which has a high nutritional value. Sweet corn and bamboo shoot corn are rich in a variety of vitamins and amino acids, and have high nutritional value, making them a delicacy on the table.

5. Corn is an important industrial raw material and the most processed and utilized cereal crop by human beings. The processing of corn kernels is mainly to produce starch, and then further processed into various modified starches, which are widely used in food, textile, petroleum, papermaking, medicine, chemical industry, metallurgy and other industries.

6. Corn has a wide range of medicinal uses. Corn starch can be used as a medium raw material to produce penicillin, streptomycin and other drugs. Corn starch can be used to make drugs such as glucose, anesthetics, antihypertensive agents, and disinfectants.

The roots, leaves, cobs, filaments and other parts of corn can be used as medicine. In short, corn is a treasure all over the body, and corn occupies an important position in the national economy and people's livelihood as food, feed or industrial raw materials.

Be sure to water more and apply more fertilizer, and at the same time, you should pay attention to the looseness of the soil, spray some pesticides, and also add some nutrient liquid to turn the soil, and understand the moisture of the soil, so that you can grow better corn.

Corn is generally double-cropped in a year, and the corn planted in spring is generally sown at the end of April and harvested in August; Corn planted in autumn is generally sown at the end of July and harvested in October.

Corn is grown in the north in the spring, and in the south in the spring and summer.

If it is spring corn, it is generally sown from south to north, from mid-February to early May, and it is generally appropriate to sow when the temperature of 10cm soil layer is stable above 10.

In the case of spring corn, it is usually sown from mid-February to early May, and in the case of autumn corn, it is usually sown in late July and early August. Therefore, it is important to pay attention to the time when sowing.

Depending on the variety of corn, the planting time is different, but if it is our corn, it can be planted in early May.

The best time to plant is in mid-February and ends in early May.

The best time to plant is in the spring. Spring is the season of rejuvenation, and this is the best time to sow seeds.

The first thing is to choose the time of spring, because the temperature in spring is more suitable, and the temperature of planting is also relatively high, so the corn planted is sweeter and the yield is higher.

Most of China can grow corn twice a year, in early April and early August.

Corn can be sown in March every year, and when sowing, it is necessary to use the sandy loam soil with rich organic matter content and loose soil to plant corn, and at the same time, it is necessary to provide an appropriate amount of water and nutrients for corn after planting to maintain the normal growth of the plant, and at the same time, it is also necessary to take appropriate measures to prevent and control diseases for corn, so that corn grows more vigorously.

The world's most important food crops are wheat, rice, and corn.

Wheat is one of the three major cereals, almost all of which are eaten, and only about one-sixth is used as feed. The Lianghe River Basin is the first region in the world to cultivate wheat, and China is one of the earliest countries in the world to grow wheat.

Rice is an important grain widely cultivated in tropical Asia, and it is mainly cultivated in the southern part of China and in all provinces in the north. The seeds are mainly divided into 2 subspecies, indica rice and japonica rice. There are many cultivars under the subspecies.

Compared with traditional rice, wheat and other food crops, corn has strong drought tolerance, cold tolerance, barrenness tolerance and excellent environmental adaptability. Corn has a high nutritional value and is an excellent food crop.

As a high-yield grain crop in China, corn is an important feed for animal husbandry, aquaculture, aquaculture, etc., and is also one of the indispensable raw materials for food, medical and health, light industry, chemical industry, etc.

Other food crops.

1. Potatoes

Native to South America, the potato spread to India in the 16th century, then to China, and is cultivated in much of the region today. Potato likes cold and dry climate, has strong adaptability, is suitable for loose and fertile sandy soil, has a short growth period and high yield. Because seed propagation leads to trait separation, the most common method of potato propagation is asexual tuber propagation.

Nucleus. 2. Sorghum

Sorghum is native to Africa and was introduced to China from India. It is mainly found in Asia, Africa and the Americas. As early as 3,000 years ago, sorghum was cultivated in the Yellow River Basin and other places in China.

3. Sweet potato

Sweet potato is native to South America and the Greater and Lesser Antilles, introduced to China during the Wanli period of the Ming Dynasty, and has been widely cultivated in all regions of the world, China is mainly distributed in most of the northern provinces and regions and Anhui, Fujian, Hunan, Guangdong and other places. Sweet potatoes like temperature, light, drought tolerance, and shade tolerance. The propagation method of sweet potato is generally propagation by cuttings and strips.