Chilling Units or Chilling Hours
Chilling unit in agriculture is a metric of a plant's exposure to chilling temperatures. Chilling temperatures extend from freezing point to, depending on the model, 45 °F (7 °C) or even 60 °F (16 °C). Stone fruit trees and certain other plants of temperate climate develop next year's buds in the summer. In the autumn the buds go dormant, and the switch to proper, healthy dormancy is triggered by a certain minimum exposure to chilling temperatures. Lack of such exposure results in delayed and substandard foliation, flowering and fruiting. One chilling unit, in the simplest models, is equal to one hour's exposure to the chilling temperature; these units are summed up for a whole season. Advanced models assign different weights to different temperature bands.
Read more about this topic: Chilling Requirement
Famous quotes containing the words chilling, units and/or hours:
“I swear to keep the dead upon my mind,/Disdain for all time to be overglad./Among spring flowers, under summer trees./By chilling autumn waters, in the frosts/Of supercilious winter—all my days/I’ll have as mentors those reproving ghosts.”
—Gwendolyn Brooks (b. 1917)
“Even in harmonious families there is this double life: the group life, which is the one we can observe in our neighbour’s household, and, underneath, another—secret and passionate and intense—which is the real life that stamps the faces and gives character to the voices of our friends. Always in his mind each member of these social units is escaping, running away, trying to break the net which circumstances and his own affections have woven about him.”
—Willa Cather (1873–1947)
“A baby nurse is one that changes diapers and loves ‘em dearly. Get up at all hours of the night to give ‘em the bottle and change their pants. If the baby coughs or cries, you have to find out the need. I had my own room usually, but I slept in the same room with the baby. I would take full charge. It was twenty-four hours. I used to have one day a week off and I’d go home and see my own two little ones.”
—Ruth Lindstrom (c. 1892–?)