In
agriculture, the growing season is the period of each
year when
crops can be grown. It is usually determined by
climate and crop selection. Depending on the location,
temperature,
daylight hours (
photoperiod), and
rainfall, may all be critical environmental factors.In the northern
U.S. and
Canada, the growing season usually means the
days between last and first
frost, or approximately the last and first occurrence of 0°
C (
freezing) overnight low temperature. This is roughly May to October.In much of
Europe, the growing season is defined as the average number of days a year with a 24-hour average temperature of at least 5 °C (6 °C is sometimes used). This is typically from April until October or November, although this varies considerably with
latitude and
altitude.
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The time period, usually measured in days, between the last freeze in the spring and the first frost in the fall. Growing seasons vary depending on local climate and geography. It can also vary by crop, as different plants have different freezing thresholds. It also is an important component in defining wetland areas.
n. ฤดูที่พืชพันธุ์เจริญงอกงาม