Corn seed germinates at 6°C-7°C, but it germinates slowly and is susceptible to bacterial infection and pests and herbicides. Generally, the ground temperature of 5-10cm soil layer is stabilized at 8°C-10°C, which is suitable for spring corn. The date of the start of sowing. Early timely sowing is conducive to grab the whole seedlings, which is more conducive to late-maturing varieties of high yield. Sowing late, it is easy to become greedy and late, and reduce the production of frost.
With the allowable ground temperature, land with better soil moisture can be sown and sown early. Soil moisture suitable for sowing is generally 20%-24% for black soil, 18%-21% for alluvial soil, and 15%-18% for sandy loam soil. Early timely sowing is conducive to prolonging the growth period, enhancing the resistance, reducing the pests and diseases, promoting the roots under the bar, the thick stalks at the base, and enhancing the lodging resistance and drought resistance. In areas with poor soil moisture and no irrigated conditions, drought can be sowed in water.
Suitable sowing dates for corn are generally from mid-late April to early May. It is more appropriate to sow at temperatures above 13°C in the saline-alkaline soil. Hillside can be properly broadcast late. Covered cultivation can be sown 7-10 days earlier than open field.
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