Experiments with different Top-dressings upon Wheat. 11 



measure so uniformly as not to get a difference of from f to 1 Ib. 

 in the weight of different bushels of the same corn. 

 The following table exhibits the produce in straw : 



TABLE showing t/ie Produce in Straw of each i-acre Plot, and Produce 



per acre. 



For the sake of better comparison, the increase per acre in 

 corn and straw over unmanured portions of the experimental 

 field, is stated in the next Table. 



TABLE showing the Increased Produce per acre in Corn and Straw over 

 Unmanured Plot, in Ibs. and bushels. 



An examination of the preceding results suggests the following 

 remarks : 



1. The plot manured with chalk-marl furnished as nearly 

 as possible the same amount of corn as the unmanured plot, 

 and rather less straw. The produce in the one amounted to 

 1620 Ibs. of corn, and in the other to 1618 Ibs. ; or each gave 

 27 bushels of wheat. 



In some parts of England chalk-marl is applied with consider- 

 able benefit to the wheat-crop, but as the soil of the experimental 

 field contained 18 per cent, of carbonate of lime, it could not be 

 expected that a marl, which owes its fertilizing properties almost 

 entirely to the carbonate of lime and to a little phosphate of lime 

 which it contains, should produce any marked effect upon the 



