C18] 2 
The potatoe land is harrowed, when the growths 
from the fets under the furface are about an inch 
long; this can be known only from infpeétion. It 
is impofhible to fay, in how many days it will hap- 
pen after their being planted, as it will depend on a 
variety of circumftances: fuch as the feafon of plant. 
ing, the quality of the foil, the ftate of the weather, 
the kind of potatoe, the nature and quantity of the 
manure, &c. Harrowing potatoe land deftroys the 
firftcrop of weeds, and creates’ fine pulverized foil for 
the plants to feed in, when they arrive atthe furface. 
By delaying this operation till the above time, the 
vegetation of the weeds is more advanced, and con- 
fequently they are ‘more effe€tually deftroyed; by 
delaying it ‘much longer there would be a danger of 
breaking off the potatoe fhoots.x—The harrow ufed 
by A. CampBELL 1s a folding- harrow, invented ‘by 
himfelf, drawn in the intervals by a fingle horfe; it 
applies ftuff to the oppofite fide of two contiguous 
rows, deftroys the weeds, and pulverizes the foil 
without levelling the row, which would tear up 
many of the potatoes, or break off their fhoots, and 
deprive the land of the advantages it has, by lying 
dry when the fhapes of the rows are preferved. A 
lighter harrow, on the fame plan, is employed in 
fmoothing the rows intended for turnips and other 
fmall feeds, immediately before they are fown. 
When the potatoe plants are all early feen,_ the 
earth and weeds are removed from them, going as 
near 
