28 cokK. 



/ood. The gain from its use alone on plot 4 amounts to no less than 

 I14.66, Other plots gave larger crops; but no other equalled this one 

 in point of profit on the fertilizer used. The result last year was simi- 

 lar; and it is true for both years that, even if labor be taken into ac- 

 count, the plot where potash alone was used gave the largest net profiH. 



•'If fertilizer only is to be used, I would recommend materials 

 which would supply per acre about 80 lbs. of actual potash, 30 lbs. of 

 phosphoric acid, and 20 lbs. of nitrogen in available forms." ' 



By W, P. Brooks, Station Grounds, North Half Acre, Amherst. 

 Bulletin No. 14, May, 1891. 



"The teaching of the results brought out by these comparisons is 

 plain. The soil most needs potash for the profitable production of 

 corn, and this would be supplied to the full extent used in our ex- 

 periments." 



By G. L. Cooley, North Half Acre, Sunderland. Bulletin No. 14, 

 May, 1891. A gain of $13.92 pef acre was obtained by the use of 

 potash. 



"The indication is very strong that the fertilizer for corn must b6 

 rich in potash to give profitable returns on this land. 



"Conclusions: 



"i. Our results show that soils differ widely in their requirements. 



"2. Potash, however, proves much more largely beneficial than 

 cither nitrogen or phosphoric acid. 



"3. Potash, as a general rule, most largely increases the yield of 

 grain and stbver; but its effect upon stover production is greater thaii 

 upon grain production. 



"Barn-yard manures are, as a general rule, relatively deficient in 

 potash, probably because of the loss of a large proportion oi the urine 

 which contains about four-fifths of the total potash of the excretions." 



1892. 



By F. E Clark, Wilbraham. bulletin No. 18, 1892. Potash pro- 

 duced a gain of $12.72. 



"The comparisons indicate the surpassing importance of potash 

 for corn upon this soil, thus confirming the general result of the work 

 with corn during the two preceding years. In view of the almostuni- 

 versal response of corn to this fertilizer lipori soils of so many different 

 classes, and of all degrees of fertility, and in so many widely separated 

 localities, the conclusion that it should te a prominent ingredient for 

 fertilizers used in this crop appears to be irresistible." 



