100 



stantly on the same ground, or one year must be appro- 

 priated for the growth of one sort, and the next for the 

 production of another. There are few cases where the 

 same land will constantly yield one and the same plant, 

 or where a repetition of the same crop, or indeed of the. 

 same species of grain, without some interval, is not found 

 to be injurious. Hemp is the principal exception to that 

 general rule ; for in Russia, the same ground invaria- 

 bly produces it, without either fallow or any intermix- 

 ture of crops. It appears from Mr Butterworth's expe- 

 riments already mentioned, that carrots have been suc- 

 cessfully cultivated for seven years, on the same ground, 

 with increasing fertility. In some instances, bear or big, 

 has been sown for years on the same ground. But in ge- 

 neral, a change or rotation of crops, has been found not 

 only expedient, but necessary. 



The propriety of adopting any rotation must depend 

 on a variety of circumstances, more especially the fol- 

 lowing, i. On the climate. Whether it is wet or dry. 

 Wet climates, for instance, are favourable to the produc- 

 tion of potatoes and oats, dry climates for pease and 

 beans-, and the rotations to be adopted in each climate 

 ought to be formed accordingly. ^. On the sot/ ; for clay, 

 loam, or sand, have each various crops best calculated 

 for them. 3. A rotation must also depend upon the si- 

 tuation of a farm> in reg4rd to the probable sale of its 

 productions : for instance, a large field of potatoes, 

 which might be worth L. 25 per acre, near a great town, 

 might not be worth L. 5, in a remote part of the coun- 

 try *. 4. On the means of improvement by extra manure, 



That able reporter, Mr Kerr, in his account of the Ber- 

 wickshire husbandry, remarks, that unless near large towns, 

 where potatoes are substituted for fallow or turnips, they 

 never constitute a complete pan of any rotation, because in 



