8 



an acre each, according as it is thought desirable to apply medium 

 or heavy applications of fertilizers. Usually for test purposes the 

 small plats are more desirable. No fertilizer is furnished for plat 

 'four, which is reserved as a check with which to compare the other 

 plats. This check plat is more important than any other single plat 

 and must not be omitted from the experiment. 



The Colleo'c has arrano;ed with a reliable firm to furnish the above 

 described sets of experimental fertilizers at $-lr.00 per set, subject, 

 however, to change to correspond to change in price of chemicals. 

 It is to be hoped that a large number of farmers will avail them- 

 selves of this opportunity to determine which elements of plant 

 food produce, on their soils, increase of crop. The price being 

 practically the same as they would pay for the same plant food put 

 up in the ordinary trade packages, the cost ought to be no objection. 

 The experimenter may grow any crop he desires upon the fertilized 

 plats. Corn or potatoes are particularly well adapted, as they are 

 usually hari^ested by hand. Beans, wheat, sugar beets or buckwheat 

 are also suitable crops. 



Those desiring to make this experiment will please write to this 

 office for an order for an experimental set of fertilizers. This order 

 thev will forward with the cash to the firm with whom we have 

 arranged and the goods will be promptly shipped. The only object 

 in having the order issued from this office is that the College may 

 keep in touch with each experimenter, may furnish him with needed 

 help and, so far as practicable, may visit him during the season. 

 Instructions for conducting the experiment and blanks for reporting 

 results to this office will l)e forwarded with the order. Applications 

 for orders should be forwarded early, as the goods must be prepared 

 in quantity and it may not be possible to supply a small number of 

 orders arriving late in the season. 



Cultural Experiments w^th Potatoes. 



Excellent results have l>een obtained on the Cornell University 

 Experiment Station grounds for a number of years in growing pota- 

 toes by a system of thorough tillage (manures and fertilizers being 

 omitted to emphasize the tillage). Circular No. 18 (Potato Culture) 



• 522 



