. Dry farming in western Canada . of the crop in the northern parts of the Prairie Pro- vinces (chiefly Alberta and Saskatchewan) was injured by a heavy frost on the night of July 24th. The purpose of instancing these facts is to show that the "average" time of frost is sometimes widely departed from, both in the favorable and unfavorable directions. This suggests frosts of- s° even more forci- bly than the short time be- tween frosts, the desirability of (1) growing "safer" crops, and (2) devel- oping a more di- versified agri- culture, partic- ularly in the temperature zo
. Dry farming in western Canada . of the crop in the northern parts of the Prairie Pro- vinces (chiefly Alberta and Saskatchewan) was injured by a heavy frost on the night of July 24th. The purpose of instancing these facts is to show that the "average" time of frost is sometimes widely departed from, both in the favorable and unfavorable directions. This suggests frosts of- s° even more forci- bly than the short time be- tween frosts, the desirability of (1) growing "safer" crops, and (2) devel- oping a more di- versified agri- culture, partic- ularly in the temperature zones showing the greatest variations from the average. 18. Frost Resistance of Different Crops.—Cereals will withstand heavy spring frosts but not fall frosts. Root crops and rape will withstand heavy fall frosts but suffer considerably from heavy spring frosts. Corn and potatoes will withstand neither, although potatoes will live through frosts that kill corn. Plax and peas suffer considerably from both spring and fall frosts, while perennial grasses and Legumes will withstand very low temperatures ai either season. 19. The Average Temperature of the Growing Period. —The average temperatures ai representative points for each month in the year are indicated mi the diagram. Fig. 14.—Frost-Free Period at Different Points. Above, length of period between spring and fall frosts of three degrees. Below, lentrth of period between frosts. Twelve year average.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectdryfarm, bookyear1921
