. Canadian forestry journal. Forests and forestry -- Canada Periodicals. Canadian Forestry Journal, June, 1920. 283 where the warm west winds of the winter and early spring, known as "chinooks," do great damage to win- ter wheat and orchards. EFFECT ON TEMPERATURE The farmer who has cultivated crops on a hot summer day need hardly be told that the warmest part of his field is the portion which is sheltered from the wind. In the lee of the windbreak there is not only no breeze to cool the body and reduce what is known as the "sensible tem- perature," but the actual temperatu
. Canadian forestry journal. Forests and forestry -- Canada Periodicals. Canadian Forestry Journal, June, 1920. 283 where the warm west winds of the winter and early spring, known as "chinooks," do great damage to win- ter wheat and orchards. EFFECT ON TEMPERATURE The farmer who has cultivated crops on a hot summer day need hardly be told that the warmest part of his field is the portion which is sheltered from the wind. In the lee of the windbreak there is not only no breeze to cool the body and reduce what is known as the "sensible tem- perature," but the actual temperature of the air is raised. Tests with a thermometer has shown that the area which is protected by a windbreak may be several degrees warmer dur- ing the day and several degrees cool- er during the night than adjacent areas not protected. Such crops as corn are benefited very greatly by warm, sultry days. The windbreak helps to create these conditions and offsets to some extent the effect of cold, cloudy weather. The cooling effect at night is of course unfavorable to growth then; but the night is a period of comparative rest, so that the nocturnal cooling off is far more than counterbalanced by the higher temperatures secured during the day. WHAT ABOUT ORCHARDS Windbreaks may appear imdesir- able for the protection of orchards in blossom or garden crops which are not hardy, because the danger of still frost seems increased by the stagna- tion of the air on the lee side. The added danger is more apparent than real, however, for still frosts only occur when there is practically no wind, and a windbreak can then have little effect one way or the other. Furthermore, complete stagnation of the air may be helpful rather than harmful if smudging is resorted to. The freezing which often causes the most severe damage to orchards is. How much of Prince Edward Island's abundant agricultural prosperity is due to the protection afford- ed by belts of trees? No section of the Dominion enjoys a
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