New York Agricultural Experiment Station. 599 



potassium, returned crops that gave a net profit over the checks. 

 This gain may be due to the larger yield of the check plats the year 

 before rather than a direct effect of the fertilizers. That the phos- 

 phorus-potassium plat was at the beginning superior to the others 

 is further shown by a reference to the yields of 1912 and 1913. The 

 stable manure plat and the wheat and cowhorn turnip plat each 

 yielded crops at a profit over the check in 1912. Again we must 

 conclude, in case of the wheat-turnip plat at least, that the treat- 

 ment was not the determining factor, but rather some unknown 

 influence, as for example soil variation, previous fertilization or the 

 pruning. In 1913, only the stable manure-lime plat yielded 

 a net profit above the check plat, 11. The superiority of the phos- 

 phorus-potassium plat has already been explained. The four-year 

 averages do not present any data that would warrant definite con- 

 clusions as to the superiority of any one treatment over another. 



SUMMARY OF RESULTS. 



In the experiments at Fredonia, nitrogenous fertilizers have had 

 a marked effect upon wood growth and yield and quality of fruit. 

 The first season, 1909, the fertilizers containing nitrogen apparently 

 increased the crop of that year, although plat variations might 

 account for the greater yield of the fertilized over the unfertilized 

 vines. 



Bud injury during the winter of 1909 and 1910 reduced the crop 

 the second year 50 per ct. The fertilized and unfertilized plats 

 were affected in like degree. The crop of 1910 was fairly uniform 

 on all the plats. The general light crop, no doubt, tended to equalize 

 the yields for the succeeding year, 1911. 



No differences in the amount or the color of the foliage were 

 apparent until the summer of 1912 in which season the foliage 

 in the nitrogen-fertilized plats clearly showed superiority over that 

 from the plats on which no nitrogen had been applied. The foliage 

 from the phosphorus-potassium plats was somewhat superior to 

 that from the check plat. 



Nitrogen and potassium have in some degree increased the size 

 of the leaves as shown in Table VI. They have also materially 

 increased the amount of wood growth. Table VII, a comparison of 

 the plats, indicates that nitrogen was the more important of the 

 two elements in bringing about these increases in wood growth. 



