Fo dfo . r pounds of available phosphoric acid to the acre. This 



_ is not a crop for ordinary commercial fertilizers. The 



190 fertilizer suggested above should be applied in the spring 



and at the same time broadcast along the rows Nitrate 



of Soda at the rate of 200 pounds per acre. If the plants 



lose color in spots late in the season, work into the soil 



about the vine an ounce or so of Nitrate, but this must 



not be done later than midsummer. 



Profitable Fertilization of Grapes. 



Summary of Experiments by the Director of Darmstadt Agricultural 

 Experiment Station, Darmstadt, Germany. 



Systematic, fertilizer experiments with grapes have 

 been conducted in this country so rarely that we must 

 seek information in this line from foreign experimenters. 

 The experiment detailed below was conducted by the 

 Darmstadt Agricultural Experiment Station, Darm- 

 stadt, Germany. The vines were grown singly in pots. 

 The fertilizer application in the two pots illustrated 

 herewith were at the rate of 3.3 ounces of Nitrate of 

 Soda, .6 of an ounce muriate of potash and 2 ounces 

 acid phosphate per vine. At the rate of 907 vines per 

 acre (vines 6 by 8 feet) this application is the equivalent 

 of 189 pounds Nitrate of Soda, 113 pounds acid phos- 

 phate and 34 pounds muriate of potash per acre. The 

 illustrations (pages 192-193) show the growth of vine and 

 also the production of fruit from the two pots, and the 

 excellent effect of Nitrate of Soda were unmistakably 

 shown. The actual yields of fruit were : 



Per Acre. 



Potash and acid phosphate without Nitrate of Soda.. . 1,024 Ibs. 

 Potash and acid phosphate with Nitrate of Soda 4,929 " 



A remarkable point in this experiment was data to 

 show the growth of leaf and wood for each 100 pounds 

 of grapes, as follows: 



With Nitrate, for 100 Ibs. grapes 47 Ibs. 13 Ibs. 



Without Nitrate, for 100 Ibs. grapes 119 34 



The evidence tends to confirm the belief that in- 

 sufficient or improperly balanced fertilizers produce 

 wood and leaf growth often at the expense of the fruit; 



