100 



MANUAL OF AMERICAN GRAPE-GROWING 



vines and left four, two or three, or no fruiting canes as 

 appeared best. The vineyard was thoroughly sprayed, all 

 plats alike. 



''Low winter temperatures, affecting immature wood and 

 buds caused by unfavorable weather of the previous season, 

 reduced yields materially during two of the five years, and 

 practically neutralized any anticipated benefit from fertilizers. 

 Following the first of these low-crop years, came a season, 

 1911, in which favorable conditions, acting upon vines left 

 undiminished in vigor by the light crop of the previous 

 year resulted in heavy and quite uniform yields on all 

 the plats. 



" The yields for the five years are shown in Table I ; and a 

 summary showing the average gains from each treatment is 

 given in Table II, with the average financial balance after de- 

 ducting the cost of fertiHzer application from the increased 

 returns from the plats receiving them. 



Table I. 



Yield of Grapes (Toxs per Acre) in Fertilizer 

 Experiments 



