44 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



IABLB III— The Grape Vine. Selected Constituents in I Ton 

 each of Fresh Fruit, Leaves, and Stems. Quantities in pounds. 



Iu the Grapes 



Iu the Leaves 



Iu the Stems 





lbs. 



lbs. 



lbs. 



Dry substance 



363 



829 



981 



Mineral matter (Ash) 



20 



93 



10 





H 



11 



H 





10 



6 



4 



Phosphoric acid .... 



3 



1 



n 



Sugar 



205 



10 



9 



The fruit of the grape vine is thus seen to be essentially a 

 sugar producer ; further, the data show that a certain propor- 

 tion of this non-nitrogenous element is found in the stems and 

 leaves also. 



In practical work it is found that, provided the mineral con- 

 stituents, and especially potash, are not deficient in the soil, the 

 produce of grapes, and of sugar in the grapes, is greatly increased 

 by the amount of nitrogen available to the vine within the soil, 

 whether derived from previous accumulations, as from old turfy 

 loam, or from direct nitrogenous manuring. I was told by a 

 grape grower of extensive experience in Jersey that he found 

 nothing so beneficial for grape culture as sulphate of ammonia, 

 both for colour of skin and for sweetness of fruit. 



The most prominent effect of the use of nitrogenous manures, 

 combined with potash and phosphoric acid, is the increased pro- 

 duction of sugar in the fruit and of dry substance and cellulose 

 in the stems and leaves. 



TABLE I V.— Composition of the Strawberry. Plants and Fruit. 

 Pounds per acre. 





In Plants 



In Fruit 



Total 





lbs. 



lbs. 



lbs. 



Dry Mibstance 



4,268 



1,054 



5,322 



Nitrogen ...... 



89 



16 



105 



Mineral matter (Ash) 



411 



49 



463 



Total 



4,771 



1,119 



5,890 



