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- 



-Yield per acr 



Merchantable 



tubers Small Total 

 BU. BU. 



537.3 

 335.6 



RTT. 



158.5 695 8 

 318.3 653.9 



CYLINDERS ABOVE GROUND 



452 



379 



322 



No. 4... . 1.024 



No. 1. 

 No. 2. 

 No. 3. 



No. 5 



No. 6... 



.709 

 .681 



.539 

 .792 

 .875 

 .314 



.282 

 .435 



.991 

 1.171 

 1.197 

 1.338 

 1.091 

 1.116 



185.6 

 155.7 

 132.4 

 420.6 

 291.2 

 279.9 



221.5 

 325.5 

 359.2 

 128.9 

 156.9 

 178.8 



407.1 

 481.2 

 491.6 

 549.5 

 448.1 

 458.7 



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 



Water per Ib. of Computed yield of 

 Dry matter dry matter dry matter per acre Water used 



LBS. LBS. LBS. INCHES 



No. 1. 



No. 2. 

 No. 1. 

 No. 2. 

 No. 3. 

 No. 4. 

 No. 5. 

 No. 6. 



.513 



.5258 



.3338 



.5007 



.4505 



.5020 



.3596 



.5425 



430.4 



415 



5869 



480.9 



516.8 



472.1 



497.3 



458.4 



12,650 

 12,960 



8,248 

 12,340 

 11,110 

 12,370 



8,865 

 13,370 



24.02 



23.74 



21.31 



26.2 



25.33 



25.78 



23.37 



27.06 



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

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



