Varieties with flint grain type are more tolerant of lower temperatures (seeding is possible at 5–6°C). Varieties with dent (dentate) grain type require warmer conditions, i.e., soil temperature between 8–12°C. For late sowing, it is recommended to choose varieties with a lower FAO. The start of corn sowing in Poland is strongly dependent on weather and soil conditions, which in recent years have been highly variable. Although the agrotechnical calendar indicates approximate dates, in practice, soil temperature, its moisture, and the risk of frost determine the optimal time to begin field work. Of course, the most important parameter determining the start of corn sowing is the soil temperature at the sowing depth, i.e., at a depth of 5-7 cm. It is assumed that the safe threshold is about 8–10°C in terms of the daily average. This to some extent guarantees uniform and rapid germination and limits the risk of seedling damage by cold. Do we already have such conditions? Rarely. Corn ...