68 INTERNATIONAL CONGRESS OP VITICULTURE 



These are starred in Table 2 which gives the results. It is quite probable 

 that the wood from those that were not weighed lost weight during the 

 interim between pruning and weighing, as the weights taken for the years 

 1912-1913 and 1914 do not show the differences in weight between the halves 

 of the section shown in 1911. 



From the above data, we conclude that commercial fertilizers for grapes 

 are at this writing having a marked effect upon wood growth, yield and 

 quality. The use the first season, 1909, apparently had a decided effect upon 

 the crop of that year, although normal Plat variations may account for the 

 increased yields of the fertilized over the unfertilized. 



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

 second year 50 per cent. Both the fertilized and unfertilized plats were 

 equally affected. The crop of 1910 was fairly uniform over 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 

 till the summer of 1912. Then the nitrogen fertilized plats clearly showed 

 superiority in these respects to those on which no nitrogen was applied and 

 also to the check. The phosphorus-potassium plats appeared superior to the 

 check. 



The plats receiving the nitrogen application produced fruit in the years 

 1912, 1913 and 1914 somewhat superior in size of cluster, size of berry and 

 compactness, to the plats to which phosphorus and potassium had been 

 applied and considerably superior to the check. The phosphorus-potassium 

 plats yielded fruit better than the check in these respects and probably more 

 mature at the time the observations were made. The nitrogen has probably 

 indirectly affected fruit characters through its action in producing more 

 healthy wood and leaf, as well as greater amounts. 



It appears that nitrogen quickly available has been the limiting factor 

 with this vineyard. That two applications, one at the time the first three or 

 four leaves of the shoots are out and a second two or three weeks later are 

 preferable to a single application of the total amount used in the two. That 

 the carriers of nitrogen in this experiment, nitrate of soda and dried blood, 

 on this type of soil should be broadcasted and lightly harrowed in and the 

 phosphorus and potassium applied before plowing somewhat earlier. 



Thus far lime has proved of no direct benefit in the experiment. 



This experiment indicates that commercial nitrogen in connection with 

 good tillage will restore a run-down vineyard on soil of a gravelly nature. 

 That systematic applications are necessary, and immediate results are not to 

 be expected, and that good tillage alone will not accomplish this. 



