New York Agricultural Experiment Station. 583 



Thus, winter temperatures, coupled with immature wood and 

 buds, have influenced the yields to a large degree in two of the five 

 years that this experiment has been running. 



gauging results. 

 During the first two years, 1909 and 1910, records were made 

 of the fruit yields from the different plats and of the vigor of the 

 vines as indicated by the wood growth and the amount and color 

 of the foliage. For the past three years, weight of pruned wood, 

 leaf weight (green and dry), amount of bearing wood, size of fruit 

 clusters, size of berries, compactness of bunch, and time of maturity 

 of fruit were also recorded for each plat. 



YIELD OF FRUIT. 



In Table V are given the amounts of fruit borne the past five years, 

 beginning in 1909. Records of individual vines were not kept. 

 The total production of each plat was recorded and from these the 

 average yield per vine was obtained. The yields per acre are com- 

 puted in tons and are net. The table shows that in 1909 the unfer- 

 tilized check yielded less than any plat in the experiment, ranging 

 from three-hundredths of a ton less in one instance to one and 

 seventy-nine-hundredths tons less in another. On either side of the 

 check plat the yields, with one exception, are considerably greater 

 than in it. The exception is in the plat to which no nitrogen was 

 applied. Differences in wood growth or in the color of the foliage 

 in any of the plats were not discernible in 1909. 



Table V. — Yield of Grapes (Tons per Acre) in Fertilizer Experiments. 



o 



5-yr. av. 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 

 9 

 10 

 11 



Complete fertilizer; lime.. 



Complete fertilizer 



Nitrogen and phosphorus 



Nitrogen and potash 



Phosphorus and potash . . 



Check 



Complete fertilizer; lime.. 



Complete fertilizer 



Nitrogen and phosphorus 



Nitrogen and potash 



Phosphorus and potash . . 



Tons. 

 3.51 

 3.96 

 3.83 

 3.87 

 3.39 

 3.12 

 4.10 

 4.02 

 3.97 

 4.18 

 3.61 



