ROTATION OF CHOPS. 211 



better still, analysis ;' and we have not the slightest 

 doubt but that in a few years there will be a possibility 

 of planting a given crop many years in succession with 

 but little harm. It is well to remember, as a principle, 

 that this should not be done when beets are grown, 

 and, better still, these roots will never give satisfactory 

 results when manured the 3'ear the seeds are sown. 

 Before any plant is permitted to enter the rotation its 

 classification, its manner of growing, and methods of 

 culture should all be known and considered. 



Lime^ plants should not follow the same class, but 

 potash" plants may come immediately in the rotation ; 

 then, again, those that draw their nourishing elements 

 from the air, and consequently peneti*ate the soil but 

 little, should be followed by those that penetrate deeply 

 and plants that absorb large amount of sulphates and 

 phosphates should not be followed by roots that are 

 planted for their seed, as these chemicals are important 

 for the formation of the latter. 



The great guide to the rotation of crops is experience, 

 and no definite rule can be laid down for beets. The 

 bi-annual rotation of wheat and beets has been adopted 

 in many portions of France. The ground under this 

 system does not receive sufficient rest, and is produc- 

 ing bad results. The first year the wheat is grown on 

 a manured soil, then the third on chemical fertilizers. 



■ See " Fertilizers." 



2 Lime plants are those wherein this chemical predominates. 

 ^ Potash plants are those wherein the plants contain one-half their weight of 

 soluble alkaline salts. 



