1918.] PUBLIC DOCUMENT — No. 31. 23a 



The tubers were examined closely for scab at the time of dig- 

 ging. On the limed area of all plots there v\-ere some scabby 

 tubers, but not enough to seriously affect the yield of merchant- 

 able potatoes except on plots and 10. On plot about 75 per 

 cent, of the potatoes were scabby, and on plot 10 about 50 per 

 cejit. were scabby. On the unlimed area of the different plots 

 there was no scab at all except on plots and 1. On these 

 about 10 per cent, of the tubers were scabby. The tubers on 

 the unlimed areas were smaller, smoother and of better quality 

 than those on the limed areas, but the yield was greater in each 

 case on the limed areas. 



Field B, Comparison of Muriate and High-grade Sulfate 



OF Potash. 



In this experiment, which has continued for twenty-five years, 

 a great variety of crops has been grown. The results obtained 

 under our climatic and soil conditions show that muriate has 

 proved the better source of potash for the following: asparagus 

 (eleven years); currants (four years); mangels (two years); 

 sugar beets (one year); corn, ensilage (one year); corn stover 

 (seven years); sweet corn stover (one year); squashes (three 

 years); carrots (two years); onions (two years); celery (one 

 year); oat hay (one year); vetch and oats (two years); and 

 alfalfa (one year). 



The high-grade sulfate has proved the better source for the 

 following: asparagus (one year); blackberries (eleven years); 

 raspberries (eleven years) ; strawberries (eleven years) ; rhubarb 

 (twelve years); potatoes (twelve years); corn, grain (eight 

 years); corn stover (one year); sweet corn, ears (one year); 

 cabbages (ten years); soy beans (five years); alfalfa (four 

 j^ears); crimson clover (one year); medium red clover (one 

 year); alsike clover (one year); common red and alsike clover 

 (one year); and mammoth red clover (one year). 



The crops grown this year were: alfalfa, blackberries, cur- 

 rants, gooseberries, mangels, rhubarb, raspberries and soy beans. 

 The results obtained are in accordance with those obtained in 

 previous years, with the exception of raspberries. This year the 

 better yield of raspberries was obtained on the muriate plot. 



