66 INTERNATIONAL CONGRESS OF VITICULTURE 



Yield of Fruit. 



In table I are given the amounts of fruit borne the past six years,, begin- 

 ning with 1909. Records of individual vines were not kept. The total pro- 

 duction of each plat was recorded and from these the average yield per vine 

 has been obtained. Then the yields have been computed in tons per acre. 

 The table shows that in 1909 the unfertilized check yielded less than any 

 plat in the experiment, ranging from three hundredths of a ton less in one, 

 to one and seventy-nine hundredths tons less in another instance. On either 

 side of the Check Plat, the yields with one exception are much greater than 

 from the Check. The exception is in the plat to which no nitrogen was 

 applied. No differences in wood growth or in the color of the foliage of the 

 vines in the plats were discernible in 1909. 



During the winter of 1909-1910 approximately 50 per cent of the buds, 

 that were to produce the 1910 crop were killed. Counts made of injured buds 

 in the different plats showed that the killing was uniform over all and that 

 the fertilizers had not thus far affected favorably, hardiness of bud. This 

 condition was reflected, as Table I shows, in the uniformity of yields from 

 the several plats in 1910. Not only were the yields about equal over the 

 entire section for the year 1910, but the small crop, by not taxing the vines, 

 probably served also, to equalize the 1911 crop, which was uniformally high 

 as the crop of 1910 was low. Thus the season of 1910 may be considered a 

 rest period. Differences in yield between the check and fertilized plats were 

 so slight that they are within the range of experimental error. 



The yield records for 1912, however, show marked differences in the 

 several plats. From them it will be seen that only one fertilized plat, No. 1, 

 to which was applied complete fertilizer and lime, fell below the check. The 

 part of the section that includes this plat, it will be remembered, with some 

 adjacent plats, were lacking in vigor at the beginning of the experiment. 

 Their poor condition, probably, is still reflected in the yields of 1912. 



The differences in yield between the check and other fertilized plats 

 range from four-tenths of a ton, to one and thirty-eight hundredths tons per 

 acre. 



In 1913 the check plat is without exception the low producer. The differ- 

 ences between it and the fertilized plats range from fifty-four hundredths of 

 a ton in the case of plat 5, phosphorus and potash, to one and eighty-three 

 hundredths tons with plat 10, nitrogen and potash. In this year both phos- 

 phorus and potash plats, which up to 1913 have produced crops comparable 

 with any of the others, gave the lowest yields of the fertilized plats. This 

 seems to indicate that the lack of nitrogen in these plats is beginning to be 

 felt. 



Again in 1914 all the fertilized plats have yielded crops considerably 

 above the check. These gains vary from 1.1 tons to 2.9 tons per acre over 

 the unfertilized. With but one exception the plats receiving Nitrogen were 

 the high yielding ones. In this instance one Phosphorus and Potassium plat 

 yielded exactly the same amount of fruit as its companion Nitrogen and 

 Phosphorus one. It would appear that the lack of uniformity of the plats 

 on the west side of the section has been somewhat overcome by reason of 

 the treatment given. 



1 Van Slyke, N. Y. Agrl. Expt. Station Bull. No. 94. 



