30 



Irrigation and Drainage 



ume of soil in which the crop grew, are given in the table be- 

 low: 



CYLINDERS IN THE GROUND 



/ Weight of tubers- 

 Merchantable 



tubers Small 



LBS. LBS. 



.No. 1... . 1.308 



No. 2 



.817 



.386 

 .775 



CYLINDERS ABOVE GROUND 



No. 1 452 



No. 2 379 



No.3 322 



No. 4 1.024 



No. 5 709 



No. 6... .681 



It will be seen from the relation between the weights of small 

 and merchantable tubers that the blight referred to had exerted a 

 very appreciable influence on the crop in all of the cases, so that 

 the relations which exist between the water used and the dry 

 matter produced cannot be regarded as normal. These relations,, 

 as they were found to stand, are given below: 



Table showing the pounds of water used by potatoes in producing a pound 

 of dry matter in tuber and vine in Wisconsin during the season of 1894 



It is evident from this table, whatever may be said in 

 regard to the yields, that the potatoes did use a very large amount 



