202 STORRS AGRICULTURAL EXPERIMENT STATION. 
In each case the yield from the plots with potash was very 
much larger than from those without. ‘The total yields per acre, 
however, and the proportion of merchantable tubers were largest 
from plot G, with the complete fertilizer, 7. e., nitrogen, phos- 
phoric acid, and potash. It will be seen from Table 50 that for 
the three years in which this crop has been used in this series of 
experiments the largest yields have in all cases been obtained 
from plot G, although the yields have been nearly as large 
from plot Y, with the largest amount of stable manure. 
The results of these experiments for the ten years in which 
the series has been thus far carried on, with the rotation of 
crops as stated, are summarized in the following table. They 
seem to indicate that there is no striking deficiency of any one 
of the ingredients—nitrogen, phosphoric acid, or potash—in 
this particular soil. The special requirements for fertilizers, as 
shown by the results from year to year, seem to be determined 
more largely by the needs of the particular crop than by the 
peculiarities of the soil. This fact is illustrated quite clearly 
by the figures in Table 50. 
; TABLE 50. 
Yields in the Station soil test experiments for the past ten years. 

















3 =F peo od ag vere g BS mie 3 
» | FERTILIZERS. ae no a2) eS] aF ED eeu eae: Bg | ED ag 
fe) = 5 Qa Sor Bor On onal KEKE poe [SK el pn, Re: 
a v Ay | pee SS Oo 
oy ') | Py RH Ay 
och bs,. “ie Bus hy Bu: | Bu. | Lbs. | Bu. | Bu.| Bu.!| Bu. | Bu. | Bu. 
oO Nothing, -| — _ |28.9 89 /29.1/10230/33.6] 55 29.6) 6.8 23.6] 54.0 
A Nit. of Soda, | 160 /|32.4] 105 |36.0 10960 41.0] 50|39.0) 6.2/27 Ak 25.2" 
B Dis. Bn.-bl’k, | 320: |33.3 97 |27.0/10710/37.6) 56|34.9| 7.1/27.4| 40.0. 
C! Mur, of Pot.,| 160 |30.4| 171 126.3 11680/40.8/ 88 |27.8| 6.4/21.4! 65.4 
00 Nothing, - —  |26.7| 8724.2] 9725/28.0 38 |26.3) 7.1/16.8] 25.8 
PN INiteoffSodaic-. 160 | 
D | | Dis. Bn.-bl’k, ee 30.1| I10 /37.9/12920 40.8 57 48.0 9.0 33.4] 35.6 
| § Nit. of Soda, 160 | 
E Mur. of Pot., | bof 32.8! 160 |30.0'13335|47.6) 104 41.3) 7.629.6] 95.4 
| { Dis. Bn.- bl’k, 20 | 
F Mur, of Pot. 60 34.4, 214 |27.8)15790|48.2 109 36.4) 9.3/24.0} 96.4 
| ( Nit. of Soda, 160 
G | + Dis. Bn.-bl’k, | 320 37-4 259 |39.4|16210/58.2/ 129 50.6) 8.6/35.4/122.4 
/ Mur. of Pot.,| 160 / 
000! Nothing, _ - — |28.5) 88 |22.5/12100/38.0 49 |29.3) 7.7/19.0} 28.2 
x J} Stable man., [10000 ) | _ ae 8.8 ; 
“| Dis. Bn.-br'k, 160 § 44. 0 /40.9)15795/57.0] IIo |48. I1.5/40.3} 88.2 
as | Stable man., |16000 43.6) 250 |41.3/15875 56.7| 125 55.12.7143, Tors 


