When is the most suitable time to sow spring corn in Henan?
SummaryThe most suitable sowing time for spring corn in Henan is from late April to early May, when the ground temperature at a soil depth of 5-10cm is stable at around 10°C-12°C. Sowing corn appropriately early can extend the growing period, resulting in better corn maturity, and can also increase the yield per mu. However, it is not that the earlier the better; if sown too early, it can easily lead to an increase in the incidence of pests and diseases, so the sowing time needs to be reasonably controlled.
I. Sowing time for spring corn in Henan
It is suitable from late April to early May. When the ground temperature at a soil depth of 5-10cm remains at 10°C-12°C, sowing can be carried out.
II. Precautions for sowing spring corn in Henan
1. Do not sow too early
Corn should be sown appropriately early, as this can extend the growing period, improve maturity, and increase yield per mu. But it is not that the earlier the sowing, the higher the yield. If spring corn is sown too early, it is prone to attack by pests and diseases, such as rough dwarf disease, underground pests, etc.
2. The sowing depth should be appropriate
Whether choosing mechanical sowing or manual sowing, the corn sowing depth is required to be 3-5cm. If the soil moisture is good, a sowing depth of 3cm is sufficient. If sown too deep, it will cause slow emergence and weak seedlings. Also, watering too much will cause a low emergence rate of corn.
3. Pay attention to rational fertilization
For spring-sown corn, the base fertilizer mainly uses farmyard manure, and the topdressing mainly uses nitrogen fertilizer. During the entire growing period of spring corn, nitrogen fertilizer needs to be applied twice as topdressing. At the small trumpet stage and the large trumpet stage, 30 jin of urea can be applied per mu each time.
4. Water the emergence water in time
If the soil moisture is poor, water the emergence water immediately after sowing, but the watering should be moderate. After watering, there should be no standing water on the ground. If flood irrigation is used, it is easy to cause water accumulation in the field, resulting in slow emergence and yellow seedlings, and in severe cases, missing seedlings.
5. The sowing rate should be consistent
After the seeds are put into the seeder, rotate the seed-dropping wheel to check whether the seeding rate of each row is the same. Sow when they are the same, which is beneficial for consistent emergence after sowing.
6. Control red spiders
Spring-sown corn often suffers from red spider damage. If the winter temperature is relatively high, it will cause red spiders to overwinter and reproduce. Red spider control is mainly prevention-oriented. During this period, abamectin plus pyridaben can be used. Spray to control when the leaves of seedlings grow to about 6 leaves, or when symptoms just begin, and then spray once more at the large trumpet stage. This can effectively prevent the harm of red spiders.
7. Control rough dwarf disease
To control corn rough dwarf disease, use 50ml of 2.5% lambda-cyhalothrin plus 20g of 10% imidacloprid and other pesticides per mu for spraying. Spray once every 5-7 days, and spray 2-3 times continuously. At the same time, weeds at the field edges and within the field can also be sprayed.