Corn growth cycle:
After the corn seeds were sowed, the swelling was observed on the first day, and the embryos were germinated. After one week, the small buds broke out; under the sunlight, the yellow buds gradually turned green; about 27 days, the seedlings Gradually grow up and start jointing; in 52 days, the corn silk is extracted, and male pollen appears at the top; about 90-100 days, the longer the corn cob is fertilized after the male and female fertilization, the corn filaments slowly dry or fall off, and grow into Corn cobs.
Corn planting time:
The northeast corn sowing period is generally from the end of April to the beginning of May. The Huanghuaihai is divided into spring corn and summer corn. Spring corn is also sown at this time. Summer corn is sown after winter wheat harvest, roughly around June.
After the corn is planted, the germination effect of 7 days will be achieved only when the temperature of 10 cm is stable at 12 °C. If the ground temperature does not reach this temperature, the corn seed will be in the soil for too long, which will affect the germination rate and be stubborn. Germinated seeds also form weak seedlings. Therefore, the majority of peasants are reminded that this year's spring corn must be based on temperature changes and timely control of planting time.
It is not possible to sow the early spring corn. The earlier the seeding, the higher the yield. Planting too early, not only low yields, but also serious pests and diseases. Such as rough disease, red spider and corn size disease. This is because the corn planted at this time is in the high temperature and rainy season during pollination and grouting, and it is easy to cause baldness or lack of grain. It is understood that only the first 15 to 20 days of planting in the local wheat harvest is the period in which corn yields the highest.
In addition, it is necessary to select the appropriate varieties to choose corn varieties not only to adapt to the fine varieties of the local weather and climate, but also to the varieties with higher comprehensive index of resistance, such as lodging resistance and stress resistance, such as Xianyu 335 and Zhongnongda 221 Limin 33 and so on. Last year, many varieties were due to poor resistance, which caused the corn to bloom in the high temperature and grouting when the temperature was low, and the bald-headed granules were severe. Such as corn cobs in the shape of gourd, lack of line.
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