TILLAGE, PLANTING, AND CULTIVATION 38 1 



the sod. The implements used must necessarily vary with the 

 character of the soil, but the plough, Martin cultivator, disk 

 harrow, spring-tooth harrow, and zigzag harrow are the imple- 

 ments most in use. The Cambridge roller is a useful implement 

 at times and on certain soils, but great care must be exercised 

 not to use it unless the soil is sufficiently dry or otherwise fit ; 

 a roller may do much damage if used at the wrong time. 



After planting it is desirable to harrow at least twice with 

 the zigzag harrow or anti-clog weeder ; this may be done when 



CHAP. 

 IX. 



1 arrow. 



the maize plants are just up above the ground, and again while 

 they are still quite young. The second harrowing should 

 kill the first crop of weeds, but should not be given till the 

 maize plants are well out of the ground, otherwise too many 

 of the young plants may be pulled up ; for the same reason 

 this harrowing should be done across the drills, not along the 

 rows ; if it runs clown the drills, a harrow tooth may pull out a 

 large part of a row of maize ; on some soils, it is true, harrow- 

 ing with the rows is found preferable to harrowing across 

 them. 



