318 



IRRIGATION PRACTICE 



distance of 3 or 

 soils it is safe to 

 clayey soils; but 

 Shallow furrows 

 late it has been 

 deep furrows are 



4 feet more commonly used. On sandy 

 place the furrows farther apart than on 

 deep, widely spaced furrows are the best, 

 were formerly used extensively, but of 

 demonstrated, especially by Fortier, that 

 by far the better. 



FIG. 87. Irrigating an apple orchard. 



When furrows are run in one direction between the 

 rows of trees it follows that there is a space in the row 

 between the trees that is left quite dry. For that reason 

 cross furrows are sometimes run between the trees at right 

 angles to the main furrows so that the land may be more 

 uniformly wetted. To cover the whole orchard uniformly, 

 the furrows are often zigzagged across the orchard instead 



