CALCAREOUS MANURES-PRACTICE. 



83 



on adjoining spaces on October 10th. The shape of the ground did not 

 admit of larger pieces, equal in all. respects, being measured, as no com- 

 parison of products had been contemplated at first, otherwise than by 

 the eye. 



From the part not marled, 414 corn-hills made 75 quarts— 



or per acre, 



Marled only, 414 100 



Manured only, 490 - - - - 105 



Marled and manured, 490 - - - 130 



The growth on the part both marled and manured was evidently inferior 

 to that of 1819. This was to be expected, as the small quantity of cal- 

 careous earth was not enough to fix half so much putrescent manure; and, 

 of course, the excess was as liable to waste as if no marl had been used. 



Experiment 10. 



Twenty acres of sandy loam, on a sandy sub-soil, covered in 1819 with 

 marl of about 30 i^er cent, average proportion of calcareous earth, and the 

 balance silicious sand— at 800 bushels to the acre. This land had been 

 long cleared, and much exhausted by cultivation ; since 1814 not grazed, 

 and had been in corn only once in four years ; and, as it was not worth 

 sowing in wheat, had three years in each rotation to rest and improve by 

 receiving all its scanty growth of weeds. The same course has been con- 

 tinued from 1819 to 1832, except that wheat has regularly followed the crops 

 of corn, leaving two years of rest in four. This soil was lighter than the 

 subject of any preceding experiment, except the 9th. On a high level 

 part, surrounded by land apparently equal, a square of about an acre (A) 

 was staked off", and left without marl— which that year's work brought 

 to two sides of the square (C, D and E.) 



