ask:
What are the factors affecting the sowing date of corn?
I. Factors affecting the sowing date
1, temperature
Low temperature is unfavorable for corn emergence, and sometimes it causes freezing damage. Autumn frost often makes the ear not mature properly, which affects yield and quality. When other conditions are suitable, the germination and emergence of corn is mainly determined by the temperature of the environment. When moisture and oxygen are suitable, the higher the temperature, the faster the germination and emergence.
Delayed planting is conducive to emergence, but in areas with short growing seasons, late sowing is susceptible to low temperature and frost damage in autumn, and the seeds cannot mature properly. Therefore, the production of the cultivated layer 5 cm of ground temperature is often stabilized through 10 ° C time, as the corn start seeding index.
2, moisture
Corn germination and growth require suitable moisture. Northeast, Northwest, North China and other regions often affect the timely sowing of maize due to spring drought; summer maize seedlings in Shandong and Hebei provinces coincide with the rainy season, and it is easy to appear "buds"; spring maize often in Hunan, Hubei, Sichuan and other provinces Improper planting period, resulting in drought in the flowering period of corn, affecting the high yield of corn.
3. Sunshine
The number of sunshine hours during the whole growth period of corn has a certain impact on the growth period. The southern growth of the southern species is prolonged, and the northern growth of the northern species is shortened. The growing season in northern China is short, and the southern varieties are moved to the north for planting. Generally, they are not suitable for late broadcasting. Due to the long growing season in the south and the northern varieties being planted in the south, spring sowing and summer sowing can be carried out, and some can be broadcast in autumn.
4. Topography and soil
At the same latitude, with the increase of altitude, the growth period is prolonged, and the sowing period of corn should be adjusted accordingly. Due to the low topography of the saline-alkali land, the soil moisture content is high, and the spring ground temperature rises slowly. It should be moderately delayed, and the ground temperature of the cultivated layer should reach 13-14 °C. However, after sowing, the salt and alkali of the topsoil will decrease, and the capillary water will rise to the surface, which will increase the salt-alkali concentration.
5, variety maturity
Late-maturing varieties have a long growth period and have a large yield increasing potential, which is suitable for spring sowing. However, in areas where the growing season is relatively short, early broadcast must be emphasized, otherwise it will not mature in time. Early and mid-maturing varieties are generally short-lived and can be broadcast in summer and autumn. In the case of late sowing, late-maturing varieties could not mature normally, and the yield was not as good as that of early-maturing or mid-maturing varieties.
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In the Arbas region of 105° east longitude and 40° north latitude where the temperature fluctuation between day and night can reach 50 degrees in winter, there is an essential native goat breed, the purebred Arbas Baby Cashmere Goat, which features thin and soft hair, a pair of horns and pink ears. Arbas Baby Cashmere Goat looks small yet are the nobles of goats.
The famous Arbas Baby Cashmere Goat, as a rare breed living in the Ordos Plateau of Inner Mongolia, is concentrated in Otog Banner, Otog Front Banner and Hanggin Banner in the western part of the Plateau. Sumu, Arbas, Otog Banner is the primary production area of Arbas Baby Cashmere Goat for its favorable natural environment, with Arbas Mountain in the west, vast natural pasture in the center and desert steppe in the south. The semi-arid steppe climate provides excellent conditions for animal husbandry.
Due to its location in the desert steppe, the area is dry and windy with little rainfall and much sand. The temperature difference between day and night is extremely high, and the annual average temperature is 6.4 °C. In the long, cold and dry winter, the lowest temperature reaches -30°C to -40°C late at night, while in the short, hot and arid summer, the highest temperature is 36.4°C and the lowest -32°C, with annual precipitation between 200mm to 400mm. The adorable, lovely and lively Arbas Baby Cashmere Goat grows in such extremely harsh conditions, thus can produce rare and quality cashmere.
Arbas Baby Cashmere Goat`s two coats are pure white. The top layer or outer coat is bright and coarse guard hair to protect the undercoat that is softer and finer down. The quality of the cashmere fleece is determined by three indicators: the diameter, length, and density of cashmere fibers. Due to its unique genes, Arbas Baby Cashmere Goat has a superiority that can never be duplicated. Its secondary hair follicle is smaller than those of other goats, and its cashmere has an average diameter between 13μm to 15 μm. It can even produce cashmere with a perfect diameter of 14.5μm, with a pure cashmere content of over 55%, which is unique worldwide. The preciousness of cashmere results from the small amount of production of each goat. Therefore, Inner Mongolian Arbas Baby Cashmere Goat was officially named by the People`s Government of Autonomous Region in 1988 and was listed on the National Register for the Conservation of Animal Genetic Resources as Class-1 protected breed by the Ministry of Agriculture in 2001.
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