MANAGEMENT OF THE GROWING CROP 



107 



difficulty is experienced in securing machinery which 

 will dig all the tubers. 



Level Culture. — In this system the potatoes must be 

 planted a little deeper than in the case of the other 

 two, to reduce the percentage of sun-burned tubers. 

 This S3^stem is advocated throughout most of Eastern 

 North America, as, among other things, the quality of 



FIG. 30 — HALI.ECK EXPANSIBLE WEEDER 



the potatoes is better, owing to the ground being 

 cooler. Its use has been found advisable at such 

 various points as Cornell,' Louisiana," North Caro- 

 lina,' Wisconsin,* and Arkansas'^ Experiment Stations, 

 while the Maryland" Station, in a trial lasting six years, 

 found little difference between level and drill culture, 

 but the slight variation was in favor of level culture. 



Method of Cultivation and Tools Used. — About 

 a week after planting the spike-tooth harrow should 

 be run over the land, preferablj' in both directions, if 

 a mulch is not made by one harrowing. This destroys 



' (N. Y.) Cornell Bui. 140, p. 390; 156, p. 175. 

 * N. Car. Bui. 85, p. 4; 146, p. 262. 

 ' Ark. Bui. 50, p. 29. 



2 I<a. Bui. 22, p. 705. 



* Wis. Report, 1899, p. 210. 



" Md. Bui. 62, p. 204. . 



