33 



open subsoil, in a good state of fertility, and was well adapted to pota- 

 toes; that of the third farm was a lif^ht, sainly loam of rather medium 

 fertility. 



Each experiment was made on 14 twentieth-acre plats. Three of the 

 plats received no fertilizers; on the remaining 11 plats 16 ponnds of 

 boneblack were combined, in sei)arate cases, with S i)()nnds of muriate 

 or sulphate of potash, or 32 pounds of kainit per plat, and combina- 

 tions of boneblack (16 pounds) with each of these different i)otash 

 fertilizers were used with 10 i)<)nnds of nitrate of soda per plat, the 

 latter being in some cases ajiplied all at the time of planting and in 

 others part at time of i)laiiting and part a month later; 1 ton of barn- 

 3'ard manure was used on one ])lat, and 1,000 i)ounds of barnyard 

 manure, with half (inatitities of the mineral fertilizers, on another j)lat. 



Early Kose potatoes were planted at the college and Uurbank on the 

 other two fiirms. The seed potatoes were cut to two eyes, and planted 

 from 12 to 15 inches apart in rf)ws 2i feet apart. The i)Otatoes were 

 dug at the convenience of the farmers, and 5-pound samples taken from 

 each plat for analysis. The yield of large ami small potatoes and the 

 total and net value of the crop at 75 cents i)er bushel for large and 40 

 cents per bushel for small potatoes, are tabulated for each plat in each 

 experiment, and the average yields of the unfertilized plats, and of 

 those receiving barnyard manure, mineral fertilizers, and a mixture of 

 the two, are given for each separate experiment. 



Relative effect of the different methods of fertilizin(j. — The following 

 table shows the average results of plats receiving similar treatment at 

 each farm: 



Average rvsnUs per acre of different methorls of fcrtUizlng. 



Farm No. 1 (college) : 



ITii r.rl il i/»'(l 



Hiiiiivaiil inaiMire 



MiiiiT.il li'itiliziirs 



Mixtin'K 111" manure ami fertiliziTM. 

 Faiin No. 'l: 



Unl'ertilizod 



Barnyard niannie 



Miueral li-rtili/ers 



^lixtnre of manure and fertilizers. 

 Farm No. H: 



Unfertilized 



Hamyard manure 



Mineral ferlilizerH 



Mixture of manure and fertilizers. 



Cost of 

 fertilizer. 



$n(i. 00 

 11. lit 



21.77 



30.00 

 11.19 

 21.77 



30.00 

 11.19 

 21.77 



Yield. 



lUtshelg. 

 101. C 

 203. 

 I.IK. 9 

 205. 9 



140.0 

 14!). 

 175.2 

 202. C 



73.0 

 143.3 

 143. R 

 191. (> 



Value. 



$113.73 

 142.20 

 110.3S 

 146. ,'.2 



101.28 

 108.02 

 129. .34 

 147.75 



47.19 

 103.98 

 101.. 52 

 137. 89 



Net value. 



$113.73 

 112.20 

 99.19 

 124. 75 



101.28 

 78.62 

 118.15 

 125. 98 



47.19 



73. 98 



90. 33 



116.12 



Gaiu(+)or 

 loss ( --). 



—$1.53 

 —14.54 



+ 11.02 



—22.66 

 + 16.87 

 +24.70 



+26. 79 

 +43.14 

 +68.93 



"A study of the table shows that the application of 200 pounds of 

 nitrogen, 200 of phosi)horic acid, and 100 of potash in 20 tons of barn- 

 yard manure per acre, was followed by the lowest yield in all cases, and 

 was protitable only on [farm Xo. 3]; that an average api)lication of 20 

 pounds of nitrogen, 50 of phosphoric acid, and 80 of potash in the form 

 of complete chemical manures was profitable on two farms; and that 

 a combination of one half of the barnyard manure and one half of the 



