ORCHARDS WITH TWO CLIMATES 
chard form a basin that holds cold air. There is no air 
drainage out of this basin. On the hillside there is a cir¬ 
culation of air. The air which these trees get is of warm¬ 
ing spring quality. The trees in the hollow are held back 
by the cold air of the basin in which they dwell. Those 
on the hillside feel spring earlier. So there is a week or 
ten days’ difference in the time of blooming. 
The success of a crop may depend on this difference of 
a week or two in the spring start. In planting an or¬ 
chard, these factors should be taken into consideration, 
and the land should be studied from the standpoint of 
air drainage. 
Lower lands may not be colder than near-by hills. If 
they have air drainage they may be just as warm. But 
basins that hold the air, as lakes hold water, are cold. 
Bodies of adjacent water, such as lakes, may have a 
warming effect on climate. When cold spells come that 
might otherwise injure fruit, these bodies of water, which 
are warmer than the air roundabout, keep up the tem¬ 
perature. 
115 
