EXPERIMENT STATION REPORTS. 183 



results from the sprayinc,- with Bordeaux. This effect lias been noticed 

 for many years in other places. 



Since potatoes usually are s])rayed for bugs, it would be well to 

 use Bordeaux mixture with the poison and to make one or two spray- 

 ings. 



Fertilizer tests with ])otatoes were made upon a plot of land that 

 was very uniform and had been handled in a uniform way for a num- 

 ber of years. The plots were one-quarter of an acre each. 



In 1907, the field grew a heavy crop of clover which was turned under ; > 

 in 1908 it produced tomatoes and in 1909 corn. The planting, cultivating 

 and spraying was uniform for all plots. 



The fertilizers used consisted of two "home mixed" lots which will 

 lie designated "A" and ''B" and a complete commercial brand which 

 will be designated '•('." The "home mixed" lots were made up to give 

 four per cent nitrogen, (in "A" II/2 per cent from the nitrate of soda and 

 2^/2 per cent from the dried blood), seven per cent phosphoric acid and 

 ten per cent potash. The complete commercial brand contained 1.05 

 per cent nitrogen, 8 per cent phosphoric acid and 10 per cent potash. 



"A" was made up as follows: 



194 pounds nitrate of soda, at |54.30 per ton |5.27 



?>o7 pounds dried blood, at |52.20 per ton 9.32 



1,000 pounds acid phosphate, at |12.00 per tou 6.00 



400 pounds sulphate of potash, at $49.00 per ton 9.80 



49 pounds filler 



130.39 



"B" was made up as follows: 



570 poimds dried blood, at $52.00 per ton |14.82 



1,000 pounds acid phosphate, at 12.00 per ton 6.00 



400 pounds sulphate of potash, at 49.00 per ton 9.80 



30 pounds filler 



130.62 



"O" was a "complete" potato fertilizer costing |31.50 per ton. At 

 digging time the potatoes Avere sorted into marketable tubers and 

 "culls." The yields given are for the marketable tubers only. 



Plot 1—500 pounds "A" per acre cost |7.60, yield 205 bu. 32 pounds. 

 Plot 2—1,000 pounds "A" per acre, cost $15.20, yield 212 bu. 20 pounds. 

 Plot 3— Check, not fertilized, yield 152 bu. 



Plot 4 — 500 pounds of "B" i)er acre, cost |7.65, vield 155 bu. 44 pounds. 

 Plot 5—1,000 pounds of "B" per acre, cost 115.30, yield 200 bu. 48 

 pounds. 



Plot 0—500 pounds "C" per acre, cost $7.71i/2, vield 151 bu. 48 pounds. 

 Plot 7—1,000 pounds "C" per acre, cost |15.75, yield 173 bu. 



