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MANUAL OF AMERICAN GRAPE-GROWING 



favorable ripening season and the smaller crop tended to 

 equalize the time of ripening on all plats. The grapes on the 

 phosphorus-potassium plats were better in quality than those 

 in the check plats but not as good as those on the plats where 

 nitrogen was used. 



"Other indexes also show plainly the benefit from nitrogen 

 in this vineyard; for size and weight of leaf, weight of wood 

 produced and number of fruiting canes left on the vines were 

 all greater where fertilizers, and particularly nitrogen, had been 

 used. The three-year averages (1911-1913) of the measure- 

 ments for these characteristics are shown in Table III : 



Table III. — Comparative Production of Leaves, Wood and 

 Fruiting Canes on Grape Vines Differently Fertilized 



(Averages for three years.) 



Cooperative e.vj)erime}(t.'<. 



*' In order to secure information as to the behavior of fertilizers 

 on tlie different soils of the Grape Belt, cooperative tests were 

 carried on in six vineyards owned, respectively, by S. S. Gran- 

 din, Westfield ; Hon. C. M. Hamilton, State Line; James Lee, 

 Brocton; H. S. Miner, Dunkirk; Miss Frances Jennings, Sil- 



' Each weight is of 300 green leaves, 5 from each of 60 vines, 

 first leaf beyond tlie last cluster was selected. 



2 Amount to the acre of wood pruned in fall. 



3 Number to the acre. 



The 



