CROPS IN ROTATION 7 



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

 a fair crop ; the barley and wheat are but little better than on the 

 unmanured plot, while the clover grows almost as freely as on the com- 

 pletely manured plot. 



Table I. — Effect of Manure on Crops grown in rotation, Agdell Field. Average 

 Xtroduce'per acre over the five last Courses, 1884-1903. 



* Average of 3 courses. 



t Average of 2 courses. 



Table II. — Crops grown in rotation, Agdell Field. Produce per acre over the 

 last complete Course {14th), 1900-1903. 



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 no effect 

 on succeeding crops, because there its growth is too small to leave behind 

 any residue of nitrogen. 



