New York Aqricuttrurat ExprrimMent STATION. 429 
effect of varying quantities of this ingredient on the productive- 
ness of the potato crop. | 
Four formulas were used on four acres of land, one on each of 
four farms. The percentages of nitrogen and phosphoric acid 
were the same in each formula, the proportion of potash being 
respectively 0 per cent, 3.5 per cent, 7.0 per cent and 10 per cent. 
On all fertilized plats the fertilizer was applied at the rate of 1,000 
Ibs. per acre, so that the amount of potash per acre varied from 
none to 100 lbs. | 
TABLE VIII.— RESULTS FROM PoTASH TEST FORMULAS. 
No. of Yield. Gain. 







plats aver- Plant food applied per acre. - ~ An “~ ~ 
aged. Large. Total. Large. Total. 
Bu. Bu. Bu. Bu. 
eae INGE LOLENIZO care clatter wrness olak's ofc os os On, La ats ape 
2 SOLES 40 lbs. nitrogen, 80 Ibs. phos. acid ; 
Bnd mo POTARR.. ese eee. 179.9 204.0 56.9 54.1 
Mioitte sce -c 40 lbs. nitrogen, 80 lbs. phos. acid 
ANUTSo IDSs CDOLABH Oe Sas. fee a 177.3 203.7 54.8 53.8 
ae sas «% 40 lbs. nitrogen, 80 Ibs. phos. acid 
Ge BOs TDS EnOtgels o vnd as. Sess 178.4 202.6 55.4 52.7 
Poi S's 40 lbs. nitrogen, 80 lbs. phos. acid 



and 100 Ibs. potash ........... 180.8 203.5 57.8 658.6 
Table VIII shows that the fertilizer without potash was as 
efficient as those containing this ingredient, and of course under 
these conditions the variation in the amount of potash was without 
influence. Such a result was a surprise, and emphasizes the need 
of further inquiry into the use of commercial plant-food. 
