8 



Green Manuring. 



as shown in the figure, and the potato plants were thus 

 supplied with water, thereby assuring the success of the 

 crop, which equalled 9 tons per acre of well shaped, good 

 cooking potatoes. The yield of Field 2, which had not been 

 green manured, was only 6 tons per acre. The tubers con- 

 tained more starch than those from Field i, but they were less 

 shapely and not so good for cooking. The cost of manuring 

 Field I was about 19s, per acre. That of Field 2 was close 

 upon £^ I2S. per acre. 



Experiments with rye gave similar results. After lupins 

 the rye plants attained heights ranging between 47 and 67 

 inches, the roots were 45 inches long, and the yield per 

 acre was about 14 cwts. of grain. Rye grown after potatoes 

 only attained the height of from 27 J to 38 inches, the 



