64 



ONIONS FOR PROFIT. 



favorable for irrigation as in this case. When the soil 

 does not let the water pass through readily, we have to 

 employ other methods of distributing it over the surface. 

 The simplest way, probably, is to conduct the water to the 

 highest part of the patch, and then let it run down a 

 slight slope, in little depressions made with a hand-plow at 

 regular distances of 6, 8, or more feet apart, according to 

 the- porosity of the soil. A vacant row must be left for the 

 water course. 



The water supply may be brought to the highest part of 

 the patch in a kind of box-ditch, as illustrated in Fig. 31. 



Fig, 



Irrigation from Box- ditch 



Another good way of distributing the water from a 

 higher source of supply is by means of lines of two-inch 

 tile laid on a slight slope, ten or twelve inches deep. 

 There is no need of providing an outlet, except it be for 

 the sake of drainage in case of heavy rains. Place the 

 tiles in each line closely together. The water will find its 

 way out at the joints, and penetrate the soil on each side 

 to a greater or lesser distance according to the porosity of 

 the soil. This latter point also determines the question of 

 what is the proper width between the lines of tile. In 



