127 
such excellent drainage that this is not important, but in other 
tions er first P requiette Ks success is a series = of we drains, 
two and 
inches dee g 
admits air to the ewer levels of the soil and increases ithe depth 
of the roots, and insures the crop against drouth. In aaron 
les i 
gro 
which thrive as well as mera aha under such favorable 
conditions. 
Next to drainage, the most important factor in the control 
of soil moisture is the presence of large amounts of organic 
t 
arden 
ell does not nee remain in the best eae of fertility unless 
de of stable manure, or some such cover 
Gop as crimson clover or winter vetch. As the garden is often 
a! eral 
been estimated as the equivalent of burning a ton of coal per 
acre a season. 
As the soil is a poor conductor of heat, this also raises the 
at 
supply of air in the soil. This air is necessary for the proper 
