The spring corn planting period is generally from the end of April to the beginning of May. Huanghuaihai divides spring corn and summer corn. Spring corn is also sown at this time, and summer corn is sown after winter wheat harvest, roughly around June.
After the corn is sown, the germination effect will be achieved for 7 days only when the ground temperature of 10 cm passes stably at 12 ° C. If the ground temperature does not reach this temperature, the corn seeds will remain in the soil for too long, which will affect the germination rate, and barely Germinated seeds also form weak seedlings. Therefore, farmers are reminded that the sowing of corn this spring must be based on changes in temperature and the timing of planting should be properly controlled.
Don't plant too early, spring corn is not planted earlier, the higher the yield. Planting too early, not only the yield is low, but also serious pests and diseases. For example, dwarf disease, red spider and corn spot disease. This is because the corn planted at this time is in the high temperature and rainy season when pollination and filling, and it is easy to cause baldness or lack of grain. It is understood that only when the local wheat is planted 15 to 20 days before the harvest of the wheat is the period when corn yields the highest.
In addition, the selection of suitable varieties. The selection of maize varieties should not only be an excellent variety that adapts to the local weather and climate, but also a variety with a higher comprehensive index of good characteristics such as lodging resistance and stress resistance. Many varieties last year were due to poor stress resistance, which caused the maize flowering and loose powder to meet high temperatures and grouting when the temperature was low and the temperature was low, and the bald and sharp gravy was serious.
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