Biological minimum temperature
This is the lowest air or soil temperature at which plants begin their metabolic processes, growth, and development.
Также говорят: lower growth threshold, base temperature, minimum developmental temperature
Knowing the biological minimum is essential for agronomists to determine optimal sowing dates and the start of the growing season. If temperatures drop below this threshold, plant growth stalls, which can lead to delayed crop maturation or seedling death during prolonged cold spells.
In practice, this metric helps in managing thermal resources effectively. Agronomists use data on the biological minimum to assess the risk of late frosts when scheduling the planting of early cereals or vegetable crops.
A common mistake is focusing solely on air temperature while neglecting the actual soil temperature at the seeding depth. Furthermore, applying fertilizers when the soil is below the biological minimum is ineffective, as root systems cannot efficiently absorb nutrients when plant metabolic activity is dormant.