138 



AGRICULTURAL ENGINEERING 



Wisconsin and therefore are no doubt large, inasmuch as the 

 nonirrigated crops do not generally receive the attention 

 given to those which are irrigated. 



Irrigation for Sewage Disposal. In many localities the 

 disposal of sewage water from cities is an important problem. 

 This is especially true of cities which are not situated near 

 large bodies of water or streams into which the sewage may 

 be discharged. In these cases, sewage irrigation must be 



Fig. 78. Furrow irrigation with sewage water. 



resorted to, and this not only provides a convenient method 

 of disposal, but it may be made a matter of profit. Perhaps 

 there is no way of disposing of sewage more satisfactorily 

 than by applying it to the soil. The organic matter in 

 sewage water is quickly purified through the agency of soil 

 organisms, when it is applied to the soil in a skillful manner. 

 The crops grown by sewage irrigation vary widely, and 



