SOILS AND ALKALI. 
27 
the per cent, of phosphoric acid, potash and nitrogen pres¬ 
ent in available condition for plant food. 
4. That the soils of Colorado compare favorably in 
fertility with productive soils everywhere. 
5. That alkali soils can be reclaimed where drainage 
is possible. 
6. That the alkaline carbonates are much more in¬ 
jurious to the soil and plant growth than are the neutral 
sulphates. 
7. That water from canals and reservoirs is much 
better for purposes of irrigation than that from wells, as 
it contains less alkali. 
8. That strong alkali water cannot long be used upon 
land without producing a soil highly charged with alka¬ 
line salts, unless drainage be employed. 
