10 AGRICULTURE IN THE TROPICS [PT. I 



up during February and March, but those which rise above 

 5000 feet land above that elevation being kept in its natural 

 condition of forest remain running during that period. 



Not only does clearing expose the soil to the sun, but also 

 to the wind, which does not blow in the forest, and which has a 

 drying effect. Shelter belts of trees have had to be planted 

 through the tea and other crops throughout many planting 

 districts, to check the sweeping of the wind over the fields. 



