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(ii) Determination of the sowing date
1. The main limiting factor of spring maize sowing date in spring corn is temperature, generally soil surface temperature of 5 to 10 cm is stable at 10 to 12°C or higher, and soil moisture content is 60% to 70% of field water capacity for sowing. Suitable period. In the range of appropriate sowing, late-ripening varieties should be properly sowed early, dry soil, sand, it is advisable; wet soil, clay should be late; land, sunny place should be early; depression, backyard should be late.
2. Summer corn should strive for early sowing in order to prevent buds sprouting, avoid cold damage later, reduce various diseases.
3. Interplanting corn should ensure that the period of symbiosis with the previous crop can not be too long, to ensure that the period of spiking does not enter the period of spikelet differentiation, and does not affect the later sowing.
4. The suitable sowing date for spring maize in the middle and lower reaches of the Yangtze River is from late April to early May. Suitable sowing dates for other regions are flexible according to local conditions.
(a) The best seeding period after sowing is quick, homogeneous and complete. It has good climatic conditions, stable growth, and high and stable yields during various stages of the growing process.