New York Agricultural Experiment Station. 199 



Average yield of check rows . . . ... . . 175.7 bu. per acre.' 



Average yield of bordeaux rows 276 bu. per acre. 



Average yield of lead benzoate rows. . 169.7 bu. per acre. 



Average yield of lime^ulpkur rows. . 136.2 bu. per acre. 



Gain from use of bordeaux 100.3 bu. per acre. 



Loss from use of leud benzoate 6 bu. per acre. 



Loss from use of lime-sulphur 39.5 bu. per acre. 



At the time of the second spraying, check rows 1 and 5 were 

 sprayed with bordeaux by mistake. Because of this it is probable 

 that their yield is slightly greater than it should be and it may 

 well be argued that the first two sections (Rows 1 to 8) of the 

 experiment should be rejected. However, to do so would not alter 

 the figures materially. If we take into consideration only the last 

 three sections (Rows 9 to 21) the results are as follows: 



Gain from use of bordeaux. 109.7 bu. per acre. 



Loss from use of lead benzoate 3.5 bu. per acre. 



Loss from use of lime-sulphur. ....... 35.5 bu. per acre. 



The difference between bordeaux and lime-sulphur is slightly 

 greater by the second than by the first method of calculation. 



'Considering the dwarfed condition of the plants on the lime- 

 sulphur rows it is not strange that these rows gave a lower yield 

 than the check rows. On the other hand, the difference in yield 

 between lead benzoate and check rows is probably small enough to 

 come within the limit of experimental error. In the absence of 

 any apparent difference in foliage this small difference in yield 

 should not be accepted as conclusive evidence that the influence of 

 the lead benzoate was harmful. 



On the bordeaux rows the tubers were of very large average size. 

 Many of them were so large that, probably, they could not have 

 been sold for full market price. 



CONCLUSION. 



The results of this experiment are so striking that but one con- 

 clusion can be drawn, viz., that neither lead benzoate nor lime- 

 1 Marketable tuberB. 



