Bui. 974, U. S. Dept. of Agriculture. 



Plate XXIV. 



Fig. I. — Blueberry Cultivation with a Disk Harrow. 



Character of the work done with a disk harrow. This tool is especially adapted for use when 

 grasses or other turf-forming weeds have invaded the plantation and the ground must be 

 loosened deeply and thoroughly. 



Fig. 2. — Blueberry Cultivation with a Spring-Tooth Harrow. 



The mellowing and good aeration accomplished in the white, sandy soil with the spring-tooth 

 harrow is well shown in this figure. Shallow cultivation is at most times desirable in blue- 

 berry plantations, for the roots of the plants tend to make their prmcipal development within 

 a foot of the surface. The plants here shown are at 4-foot intervals in rows 8 feet apart. 



