CROPS IN ROTATION 9 



manure. With minerals, but without nitrogen, the Swedes continue to 

 ofive a fair crop ; the barley and wheat are better than on the unmanured 

 plot, while the clover grows almost as freely as on the completely 

 manured plot. 



Table I. — Effect of Mamire on Crops grmvn in rotation, Agdell Field. Average 

 produce per acre over the seven last Com'ses, 1884-1911. 



Average of 5 courses. 



t Average of 2 courses. 



Table II. — Cro2}s grown in rotation, Agdell Field. Produce per acre over the 

 last complete Course (\Gth), 1908-1911. 



When the Plots 2 and 4 grow a good crop of clover, the residues of 

 the crop have a very beneficial effect upon the succeeding crops of the 

 rotation, as compared with the crops of Plots 1 and 3, which are bare 

 fallowed; the wheat is increased by something like 15 per cent., the roots 

 (although manured) are slightly better, and the barley, following the 

 roots, still shows the value of the preceding clover crop. No such residue 

 seems to be left behind by the bean crop, whenever that is taken in the 

 rotation instead of clover. On the unmanured Plot 6, only, the clover 

 shows little or no effect on succeeding crops, because there its growth is 

 too small to leave behind any residue of nitrogen. 



