OF ROTATION OF CROPS. 319 



for instance, clay, loam, &c. ; but, on the whole, I think it 

 more expedient, first, to discuss the different courses of 

 crops, according to the number of years they respectively 

 require to finish the rotation ; some occupying two years, 

 some three, some four, some five, &c. ; and then to explain 

 what rotation is best calculated for each kind of soil. 



1. Rotations by Years. 



Two Years' Rotation. In particular cases, some farmers 

 have adopted a rotation of two crops. A field belonging to 

 the Honourable George Abercromby, embanked from the 

 Forth, carried, for several years, beans and wheat alter- 

 nately. Upon his best loams, Mr Brown of Markle often 

 takes wheat and beans alternately, summer-fallowing the 

 ground, when its condition requires that process, but he 

 considers the year in which the ground is summer-fallowed, 

 to be the one in which he has the best crop. Mr Fairie of 

 Farme, near Glasgow, has adopted the same system, giving 

 a moderate dressing of dung every fourth year. Dr Charles 

 Stuart, on his farm near. Edinburgh, has tried a similar 

 system on four acres-and-a-half of loam, the rotation being 

 wheat and green crops alternately ; but the latter were al- 

 ternate potatoes and beans, both drilled. In the course of 

 fourteen years, he has had, on this field, four crops of po- 

 tatoes, three of beans, and seven of wheat. To every green 

 crop, putrescent manure was applied; thirty tons at least 

 to potatoes, and twenty-five to beans. The potatoe crops 

 were all good : The two first crops of beans were very good: 

 The third, indifferent. The crops of wheat were large, 

 producing from ten to thirteen bolls, Linlithgow measure, 

 per Scotch acre, or from 32 to 41 bushels per English acre. 

 The only deficiency was in crop 1789, which averaged but 



