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It is a great advantage in the convertible system 

 of cultivation, that the whole of the manure is em- 

 ployed ; and that those parts of it which are not fitted 

 for one crop, remain as nourishment for another. 

 Thus, in Mr. Coke's course of crops, the turnip is the 

 first in the order of succession ; and this crop is man- 

 ured with recent dung, which immediately affords suf- 

 ficient soluble matter for its nourishment ; and the heat 

 produced in fermentation assists the germination of 

 the seed and the growth of the plant. After turnips, 

 barley with grass seeds is sown ; and the land having 

 been little exhausted by the turnip crop, affords the 

 soluble parts of the decomposing manure to the grain. 

 The grasses, rye grass, anH clover remain, which de- 

 rive a small part only of their organised matter from 

 the soil, and probably consume the gypsum in the 

 manure which would be useless to other crops : these 

 plants likewise by their large systems of leaves., absorb 

 a considerable quantity of nourishment from the atmos- 

 phere ; and when ploughed in at the end of two years, 

 the decay of their roots and leaves affords manure for 

 the wheat crop ; and at this period of the course, the 

 xvoody fibre of the farm-yard manure which contains 

 the phosphate of lime and the other difficultly soluble 

 parts, is broken down : and as soon as the most ex- 

 hausting crop is taken, recent manure is again ap- 

 plied. 



Mr. Gregg, whose very enlightened system of 

 cultivation has been published by the Board of Agri- 

 culture, and who has the merit of first adopting a plan 

 similar to Mr. Coke's upon strong clays, suffers the 



