22* 



Table 15, - Siimmary of fertilizer -tests ^n Michigan vineyards 









t 



1 







• 

 • 



Value of : 



Chance 





.Plant food per acre : 



Grape : 



Increase in : 

 grape yield : 



increase in : 

 yield per acre : 



occur- 







■ 





ence 



Years and • • 



.Nitro-; 



Phos- : 



Potash: 



yielcS 



. over c^ook : 



over fertilizer: 



in 100 



soil typos : 



gen ; 



phoric: 





per : 



: yield : 



cost at 1928 : 



trials 







acid : 





. acre : 



(acre basis) : 



prices 1/ : 



2/ 





Pounds : 



Pounds : 



pounds ; 



^Tons : 



Tons : 



Percent: 



. Dollars j 



: Number 



1922-1925 5/ ; 

 Fox sandy, ' 

 loam soil " 



,25 : 

 , 25 : 

 : 25 : 

 ; 25 : 



: 

 70 : 





 70 ; 



: ; 

 ; ; 

 , 109 ' 

 ; 109 : 



. 3.65 



. 3.71 ; 



• 3.83 : 



3.80 : 



: .10 : 



; .25 : 



.37 : 



. ,34 : 



5 : 



7 : 

 11 : 



10 : 



'-2 • : 

 -5 - : 

 -3 : 

 -8 ■ : 



54 

 23 



: 18 

 26 



1922-1925 4/ ; 

 Fox sandy, ' ' 

 loam soil 



: 17 : 

 : 34 : 

 : 51 ; 

 : 67 : : 



, 

 ' . 

 ; 



; 



: 

 ; 

 ; 

 ; ■ 



: 3.27 : 

 : 3.56 

 : 3.34 ' 

 ; 3.12 



. ^18 : 

 : .47 : 

 ; ^25 : 

 : .03 : 



6 : 



; 15 : 



8 : 



1 : 



: 

 3 : 



-13 : 



; 49 

 ; 15 



; 54 

 ; 90 





; 34 ,i 



: 



: • 



: 3.14 



: .88 : 



; 39 



: 12 



: 46 





: 34 



: 70 



: 



: 3.30 



: 1.14 : 



; 53 



: 13 



: 37 



1924-1929 5/ 



: 34 



: 



: 109 



: 3.26 



: 1.10 ' 



; 51 



: 12 



: 46 



Plainfield, 



: 34 



: 70 



: 109 



: 3.36 



: 1.20 



: 56 



: 9 



: 16 



loamy sand 



: 34 



: 



: 



: 2.98 



: .63 



: 27 • 



; 8 



: 63 



■ 



; 34 



I 



: 



» 



: 2.72 



: .37 



: 16 



: 2 



: 77 



1/ Fertilizer prices per ton used as given in table 1; Sodium nitrate, 

 ..158.74; ammonium sulphate, $59.29; acid phosphate, $21.24; potassium 

 chloride, $46. 25. As estimated cost of applying fertilizer $1 per acre was 

 adde^. Orapes wore valued at $22 per ton on the vines. 



2/ See footnote 2, table 12. 



3/ Partridge, IT. L. , Cultural Methods in the Bearing Vineyard, Michigan Agri-. 

 cultural Experiment Station, Circular Bulletin No. 130. 1930. Table 1, p, i9 

 Fertilizers were applied at the following rates on an acre basis; Nitrate of 

 soda, 163 pounds; acid phosphate, l6 percent, 435 pounds and potassium chloride,: 

 218 pour^s per acre. 



4/ Partridge, N. !•, Cultural Methods in the Bearing Vineyard Mi c hi f?p.n Agri- 

 cultural Experiment Station, Circular Bulletin No* 130. Table W. p. 11. Sodium 

 nitrate was' applied at the follo^^^ing rates on an acre basis, 109,218, 326, and 



^*p£?^ridge, N. L. and Yoatch, J. 0., Fertilizers and Soils in Relation to 

 Concord Orapes in Southv/ostern Michigan. Michigan Agricultural Experiment 

 Station, Tech. Bull. No. 114. 1931. Table 9, p. 36. Fertilizers T/ere applied 

 at the follov/ing rates on. an aero basis.: Nitrate of soda, 217*5 pounds, acid 

 phosphate, 435 pounds and muriate of potash 217.5 pounds. In the last two 

 trials nitrogen Y/as applied in the form of ammonium sulphate, 163 pounds per 

 acre* In the last trial ground limestone was also applied. 



