138 BULLETIN OF THE BUSSEY INSTITUTION. 
Bussey Institution (see p. 80). The field was left fallow during 1872, 
and in the spring of 1873 it was cross-ploughed, harrowed, and divided 
into thirteen strips or plots, each measuring 1644 X 104 feet, and 
consequently containing about #5 of an acre. Early Rose potatoes 
were planted in drills upon each of these strips, May 19. There were 
five drills in each plot. The seed-potatoes were cut so that there was 
a single eye upon each piece, and care was taken that each of the 
drills should receive the same number of pieces. With the exception 
of the manures, the plots were all tilled and treated alike. The kinds 
and amounts of fertilizers used and the yield of potatoes from each 
plot are given in the table in terms of pounds. 
Nos. Pounds of 
of the Weights of fertilizers used. potatoes 
plots. harvested. 
4 lbs. “ muriate of potash” of 82 per cent, with hard- 360.5 
coal ashes* . 
9 4 lbs. muriate of potash plus 4 Ibs. ‘nitrate of soda, w with 311 
hard-coal ashes* . 2 ’ va! aes 
3 No manure. . 0c soups staan 369 
4 4 lbs. of the muriate of potash o. Ps 839 
5 4 Ibs. of the muriate of potash plus 4 Ibs. of nitrate of i 989 
soda . 
4 lbs. of the ‘muriate ‘of ‘potash plus 4 Ibs. of inigrate of 
6 soda plus 6 lbs. true ep hORR LAR, of lime from 352.5 
Mr. Lawes . . ; 
7 6 lbs. of the Lawes superphosphate ‘ 320 
8 Mi Ibs. of the Lawes ata phone plus 4 4 Ibs. of the 169 
muriate of potash . of 
9 4 Ibs. nitrate of soda . 120 
10 i 11 lbs. nitrate of soda plus 12 Ibs. of the Lawes super 3 129 
phosphatet . . 
4 lbs. nitrate of soda plus 6 ‘Ibs. of the. Lawes super- 
11 } 170 
phosphate .. 
Stable manure ft spread broadcast at the rate of 10 cords 
12 per acre i aie 
13 Stable manure (at same rate as above) plus plaster of + 365 
paris, both in the drills . . . 
» The mie were dissolved in water, and the solution was mixed with enough coal-ashes to absorb. 
it completely 
+ Formula recommended by Mr. Lawes in a letter addressed by him to the Massachusetts Society 
for Promoting Agriculture. 
¢ The stable manure contained, perhaps, a third of its bulk of peat in both instances, 
