16, 



Tcble 11, - YoT- a giv.on .f Gr.1>ilizer application the avorage increase in 

 yield for Chautauqua-Erie vinoyards on light-- textured soils com- 

 pared with increase in yield on Fred.onia tc-^t plats 





; • Quantity : 

 : per : 



: Increased ^rape' yields per acre 



Plant food : 



: Chautauqua-Erie j 



; Fredonla tost plats, 





; acre : 



• Yinoyards^ 1928 l/: 



; 190.9-1930: 2/ 





; ■ Pounds : 



: Pounds* ; 



; Pou-nds 



Nitrogen 



: 47 : 



1273 : 



J 4, 



: 1627 



Phosphoric acid : 



: 42 : 



; 7:77 



f 4 



: 227 



Potash 



: 96 : 



: 582 



» » 



: 7,87 



Total 



; 185 



; 2652 



: .2641 



1/ Calculated from the regression equatloh for the light- textured soils; 



table 9, 



2/ Calculated from averages of test' plats given" in table 10* 







Increased; 





; Increased ; 









; "' ylelcl ■; 





. yield ; 





Plant food : 



Plat ■ ; 



; ■ over- ; 

 chGtik : 



Plr.t ; 



; over 

 che<3k 



: Average 





: Numbor ; 



: Tons : 



Number : 



Tons ; 



: Tons 



N. K. ; 



; 4 ; 



\ 1,16 : 



10 i 



, 1.38 : 





N. P. : 



! 3 ; 



; ,84 ? 



9 : 



; 1.14 ; 





K exceeds P by : 





: .32" : 





: .24 ; 



; .28 



N.E. 



; 4 



t 



1 1.16 : 



10 



; 1,38 ; 





P.K. 



: 5 : 



: ,45 : 

 : ,71 : 



U ; 



; .70 ; 





N excGods P by 



; .68 



: .70 



N.P.K. 



: 2 



: 1.29 : 



8 



i 1.34 



; 1.32 



Let "p^^ equal the increase in tons of grapc5s per acre a.uc to the application 

 of 42 pounds of phosphoric acid. Then the increase in yield due to the 

 ap^^lication of 47 pounds of nitrogen is equal to P + ,70 tons; the increase 

 due to 96 pounds of potash is oqual to P !• .28 tons. The total increase duo 



to the application of the three kinds of plant food v/as equal to 1.32 tons 

 per acre. Therefore 



1.32 tons =..(P + .70 tons) + P + (P + .•28 tons) 



p - •!! 1/3 tons 



