254 Thysics of the Soil. 



320. Early Fall Plowing In regions and at times where 

 tliere is a deficiency of rain, where the soil is light and 

 when the amount of soil leaching is small it is often de- 

 sirable to plow as early in the fall as the crop has been re- 

 moved from the ground, in order to save soil moisture and 

 to enable the nitrates and other soluble salts to develop in 

 sufficient quantity for the next season. Where crops hold 

 the soil moisture low it may even become necessary in 

 dry climates to raise one only every other year because 

 the plant food and the crop cannot be produced by the 

 available moisture of a single season. But early fallowing 

 in the fall will often render the full year unnecessary. 



