POTATOES. W 



acid, when used alone, or in combination with nitrogen, brought but 



little over nothing; but when used with potash, its beneficial effects 



were quite marked. 



"The vines upon all the plots receiving dissolved bone black, but 



without potash, were more seriously affected with blight than those 



receiving potash." 



KENTUCKY, 1888. 



By M. a. Scovell, Director. Bulletin No. i6. 



The results show: ''That the yield of merchantable potatoes, and 

 also the total yield, was largely increased on those plots containing 

 potash. • 



"That 200 lbs. of sulphate of potash produced an increased yield 

 slightly exceeding that produced by the application of 80 loads of 

 stable manure. 



•'That the results were the same as to th« yields, whether muriate 

 or sulphate was used." 



Summary: "Potash is what is needed on our soil for the potato 

 crop. 



"The effect of potash was shown upon the growth of the potatoes, 

 as well as the yield. The vines were much more thrifty and stood the 

 drought better. The potatoes on plots containing potash were larger 

 and more even in size than those on other plots." 



Financial results: A profit of $21.43 was obtained from sulphate 

 of potash alone. 



"The results show decidedly that there was a profit in the use of 

 potash compounds, and that the money expended in ammonia sulphate 

 and super-phosphates was entirely lost. Plot No. 11, which received 

 80 loads of barn-yard manure, probably did not produce an increase 

 enough to pay for the expense of hauling out the manure. 



"Thus we find by these experiments, that it is potash compounds 

 that are needed to enrich the soil of the Experiment Station Farm for 

 the production of potatoes. They indicate, also, that impoverished 

 soils of the above class, in the blue-grass region, would be improved 

 ^^y the application of potash compounds." 

 ^ 1889. 



By M. a. Scovell, Director. Bulletin No. 22. 

 ^b The results show: "i. That the yields of potatoes were largely 

 ^Increased by the use of sulphate of potash, either when used alone or in 

 combination with nitrate of soda, or with acid phosphate, or with both. 



