BENEFICIAL EFFECT OF CLOVER 



201 



this .is removed from the land the nitrogen accumulated in the 

 roots and stubble is sufficient to raise the total produce of the 

 wheat from 5147 Ib. to 6052 lb., or by 17*6 per cent. On the 

 completely manured plot a still greater crop of clover is 

 obtained, averaging 50 cwt., and this still further increases the 

 wheat crop from 5493 lb. to 6093 lb., or by 0'9 per cent. 



With the beans an entirely different result appears ; on 

 each of the three plots the bare fallow proves a better prepara- 

 tion for wheat than does the bean crop, after which in all cases 

 the wheat crop is somewhat diminished. On the unmanured 

 plot the average diminution is 11 per cent., on the mineral 

 manured plot it is 1*5 per cent., and on the completely manured 

 plot it is 27 per cent. In other words, the bean crop, which is 

 pulled, not cut, does not leave behind any great amount of 

 nitrogen gathered from the atmosphere not sufficient to 

 compensate for the absence of the summer tillage that the 

 bare fallow receives. These results are even more clearly seen 

 when the crops following the largest clover and bean crops 

 are considered, the results of which are set out in Table 

 LXVIII. 



TABLE LXVIII. Crops grown in rotation, Agdell Field. Effect of the 

 largest Clover or Bean Crop on the following Wheat Crop. Total 

 produce per acre. 



In 1910 the clover on the unmanured plot produced only 

 17 '4 cwt. of hay and caused a barely perceptible increase in the 

 total produce of the wheat, amounting to only 4 '5 per cent. On 

 the plot receiving a complete mineral manure, however, a very 

 large crop of clover was obtained, 64'1 cwt. per acre, and this 



