ISTew York Agricultural Experiment Station. 419 



(2) That the 4, 8 and 10 formula is somewhat more efficient 

 than the " potato f ornrnla." 



(3) That muriate of potash produced no definite deleterious 

 influence on the quality of potatoes. 



EXPERIMENTS IN 1898. 



The experiments of 1897 have been repeated in 1898, in 

 accordance with the plan to continue them for a series of years. 



The work has been enlarged, however, by the addition of four 

 more formulas or mixtures of fertilizing ingredients designed to 

 test the use of such large quantities of potash salts as appears to 

 be the custom on Long Island and in other localities. 



The 4, 8 and 10 formula, to which reference has been made, 

 calls for the application of more potash than of either nitrogen or 

 phosphoric acid. Certain observations in connection with former 

 experiments led the writer to doubt the wisdom of this practice, 

 though not to deny it, consequently an additional acre was se- 

 cured on each of the four farms where potato experiments are in 

 progress, to be devoted to experiments with varying amounts of 



potash salts. 



the fertilizers used. 



The purposes of these experiments as now arranged require the 

 use of eight different mixtures of fertilizing materials, the in- 

 gredients and composition of which are given below. 



potato formula. 



This formula is supposed to contain plant foods in nearly the 



proportions used by the entire potato plant excepting that the 



phosphoric acid is in considerable excess. Two mixtures were 



used : 



Mixture No. 1. 

 Ingredients. Composition. 



Nitrate of soda.' 102 lbs. Nitrogen 7.0 per ct. 



High grade dried blood.. 900 lbs. Available phos. acid 4.0 per ct 



Acid phosphate. 508 lbs. Potash 10.0 per ct. 



Muriate of potash 400 lbs. 



2,000 



