204 



THE EOTHAMSTED EXPERIMENTS. 



Legumes clover were grown than on those that were fallowed ; a result 

 ulationof' doubtless due to the increased growth of the leguminous crop 

 nitrogen, under the influence of the potash manuring, and to accumula- 

 tion of nitrogen in the soil thereby. It may further be 

 observed (though not shown in the table) that in 1892 — that 

 is, the first year of the twelfth course — the produce of the 

 manured plots was generally higher than in either of the two 

 preceding courses. 



The accompanying figures represent selected typical Swedish 

 turnip-plants, grown in 1892 — (1) without manure, (2) with 



1. Crop of roots, 1892 : 8J cwts. per acre. 



2. Crop of roots, 1892 : 11 tons 6£ cwts. per acre. 



3. Crop of roots, 1892 : 24 tons 18 cwts. per acre. 



Illustra- 

 tions ex- 

 plained. 



the mixed mineral manure alone, and (3) with the mixed 

 mineral and nitrogenous manure. Each plant was fixed upon 

 a scaled background and so photographed, and the figures as 

 given are about one-twentieth natural size, and strictly com- 

 parable. The quantities of produce recorded show that with- 

 out manure it was less, but that by each of the two descrip- 

 tions of manure it was considerably more, than the average 

 of the preceding courses ; and both the reversion to the un- 

 cultivated condition without manure, and the increased 



