IRRIGATION 



8t 



a gentle shower the foliage is cleansed and the effect is 

 to encourage the most healthful and vigorous growth ; 

 (6) insecticides and fungicides and liquid fertilizers may 

 be applied through the water lines; (7) the cost of instal- 

 lation is low, considering the merits of the system. It 

 varies from $90 to $150 an acre. 



Water may be pumped directly into the system, or 

 reservoirs may be constructed to hold it. When water 

 from a city reservoir can be secured at a reasonable price 



FIG. 17. UNION FOR THE SKINNER SYSTEM OF IRRIGATION 



the problem is very simply solved. A great many grow- 

 ers, however, pump directly into the system. The water 

 mains or feeders should be of ample capacity to supply 

 the nozzle lines. 



All nozzle lines should be of galvanized pipe and of 

 the size indicated in the accompanying table. The pipes 

 are generally 50 feet apart in outdoor irrigation, and 

 should be supported on posts about 25 feet apart. Two- 

 inch pipe is generally used for posts, while some gar- 

 deners use cedar or locust posts. 



