BULLETIN OF THE BUSSEY INSTITUTION. 309 
interfere with the legitimate purpose of the latter which is to diffuse 
itself through the soil and so disseminate phosphoric acid, neither of 
them should be put into the original mixture of fertilizers which con- 
tains the superphosphate. They may perfectly well be applied to the 
land after the superphosphate has had time to soak into the soil. As 
a matter of course, considerations such as these are, in the present 
state of agricultural knowledge, of theoretical interest rather than of 
practical importance, since the trouble and expense of handling any 
considerable variety of manures would in many instances be likely to 
counterbalance the advantages that might be gained in the manner 
indicated. 
The following calculations, similar to the one given on page 306, 
show the amounts of fertilizers referred to the acre of land, and their 
approximate cost, in the cases of mixtures such as were applied to 
square EE (north) No. 4 of the section devoted to beans, and to 
squares G and K among the barley crops.* 
For an acre of land there would be required of the mixture of fer- 
tilizers used upon 
Square LE (no7th) 4, beans. 
Of nitrate of soda. . 1115 grms. X 162 = 180.630 kilos. = 397% lbs. 
Of sulphate of potash 611 ;, ‘> 162== 98.982 ,, = 2173 ,, 
Semen. . «(CO00 |, xk 162== 81.000 ,, = 178} ,, 
The cost per acre would have been :— 
3974 lbs. nitrate of soda. . . . - « f@ $0.0375 = $14.90 
217% ,, sulphate ofpotash . ... @ 0.083 = _ 6.53 
Sere pone med, see 8 ee) @ 0.038 == 6.85 
$26.78 
Square G, barley. 
Of wood-ashes . . . 2778 grms. X 162 = 450.036 kilos. = 990 lbs 
», sulphate of ammonia 660 ,, x 162—106.920 ,, == 235} ,, 
The cost per acre would have been :— 
990 Ibs. (= 20} bushels ¢) wood-ashes . (@$0.80= $6.15 
2354 ,, sulphateofammonia . . . . @ 0.06= 14.12 
$20.27 
* The yield of beans upon EE 4 was at the rate of 82;%, bushels to the acre, 
that of barley on square G was at the rate of 844 bushels, and on square K at 
the rate of 50 bushels to the acre. 
Tt See page 206, note. 
